Sonin DT220, InchMate 2000 Reference Manual

Reference Guide

Professional
Foot / Inch / Fraction
Construction Calculator

SONIN INC.
Phone: [phone]  Website: www.sonin.com

© 2003 Sonin Inc. All Rights Reserved
Printed in China 018-0000-0003 Rev.2

InchMate® 2000

InchMate

®

2000

Model DT220

INTRODUCTION 3

Key Pad Information 3-11

General Purpose Keys 3-4
Memory Keys 4-5
Other Functions Keys 5-6
Liquid Keys 6-7
Weight Keys 7
Dimension Keys 7-9
Triangle Keys 9-11

GETTING STARTED 12-19

Working with Dimensions and Units 12-13

Addition 12
Subtract 13
Multiply 13
Divide 13

Default Settings 14-15

Reduced Fraction Mode 14
Weight/Volume 14
Construction Settings 15

Conversions 15-17

Linear Conversions 15-16
Area Conversions 16
Volume Conversions 17
Weight Conversions 17
Liquid Conversions 17
Temperature Conversion 17

Paperless Tape Review 18-19

EXAMPLE PROBLEMS 20-35

Complex Area 20
Carpentry Rough Opening 21
Carpentry  Joist Numbers 21

CONTENTS

- 1 -

CONTENTS

- 2 -

Costing a Concrete Walkway 22
Squaring a Foundation 23
Stair  Run Known 23-24
Stairs with Unconventional Risers & Treads 25-26
Raked Wall  Stud Lengths 27
Board Feet Lumber 28
Circle Solutions 28
Simple Concrete Footings 28-29
Concrete Weight/Volume 30
Roof Rise 31
Roof Pitch  Given Rise & Run 32
Regular Hip/Valley & Jack Rafter 32-33
Irregular Hip/Valley & Jack Rafter 34-35

REFERENCE 36-37

Chaining 36
Error/Overflow 36
Auto-Range 36
Care 37
Battery 37
Resetting Your Calculator 37

APPENDIX 38-42

Conversion Tables 38
Area Formulas 39
Volume Formulas 40
Lumber Sizes 41
FCC Statement 42

WARRANTY & REGISTRATION 43-45

Warranty Information 43
Customer Service 44
Warranty Registration 45

- 3 -

INTRODUCTION

If you build or design things you know the importance of
working with accurate dimensions. The most frustrating and
costly construction headaches can usually be traced to
dimensional errors.

The INCH

MATE

2000 is part of the new generation of Sonin
Feet-Inch-fraction Calculators helping people who work
with dimensions to simplify difficult and tedious calculations.

KEY PAD INFORMATION

General Purpose Keys

Note: The key to be pressed appears between the left and
right brackets, e.g., [+] except when referring to numerals.

On/Off

Turns calculator ON and OFF.
To save the battery, calculator will turn off
automatically after approximately 10 - 12
minutes of inactivity at which time the displayed
value and memory content will be cleared.

CE/CLR

Press this key once clears the current entry.
Pressing it twice clears display to 0.
Memory register & default setting are not affected.

0

Enters the numbers 0 thru 9 into the display.

to

9

- 4 -

KEY PAD INFORMATION

4321

Performs arithmetic operation.

5

Completes all previously entered arithmetic

operations and displays the result.

·

Enters a decimal point.

2ND

Activates the 2ND Function for designated
keys. 2ND function is indicated above keys.

%

Percent is used to find a given percentage

of a number.

6

2ND

X2 is used to take the square (quantity

multiplied by itself) of the number on the
display. No operation is performed if the
square of an area or cubic dimensioned
number is taken, Error will be displayed.

9

2ND

Square Root - takes the square root
of a number. Error will display if you try
to take square root of a linear or volume
value.

Memory Keys

M+

If memory is clear, enters displayed quantity
into memory. If a value is already stored
in memory this will add displayed quantity
to memory.

- 5 -

KEY PAD INFORMATION

2ND M+

Subtracts displayed quantity from

memory. The result is then placed in
memory.

RCL

Memory Recall retrieves data from

selected memory & displays it.
NOTE: To display & keep in memory
press [RCL] [ M+ ] . To display and
remove from memory press [RCL] [RCL].

2ND

RCL

CLEARS MEMORY without displaying it.

Other Functions Keys

Cost

Cost is used when calculating the cost of

items.

%

2ND

Restore Defaults allows the calculator to

restore ALL changed default values
(NOTE: effects Wt/Vol., fraction, stair,
rake, jack & hip/valley settings).

3

2ND

p is used to insert the value of Pi
(3.141592) onto the display for use in
subsequent calculations, or for use as
part of a mathematical process.

0

2ND

English/Metric Mode changes the first

function Imperial unit keys to their
corresponding metric unit functions.
It allows the user to enter a series of

- 6 -

KEY PAD INFORMATION

metric values without having to use the
second function key. The

Metric

icon is
active when the metric mode has been
selected. To return back to English mode
press [2ND] [ 0 ] again.

5

2ND

Paperless Tape Review Access.

·

2ND

Paperless Tape Review Exit.

5

2ND

Weight Per Volume displays and enters

a weight per volume (density) to be used
in calculating weight. (see Default Values)

8

2ND

Weight is used to calculate the total

weight of a volume of material.

2

2ND

+/- Change Sign changes the sign of

displayed value between positive and
negative.

4

2ND

Inverse 1/X divides the number 1 by the

number on the display

Liquid Keys

Gal

Gal Use to enter and convert gallons.

Fl Oz

Fl Oz Use to enter and convert fluid

Ounces.

- 7 -

KEY PAD INFORMATION

2ND Gal

Liter Use to enter and convert Liters.

2ND

Fl Oz

ml Use to enter and convert milliliters.

Weight Keys

Ton

Ton Use to enter and convert Tons.

2ND

Ton

M Ton Use to enter and convert Metric

Tons.

lbs

lbs Use to enter and convert pounds.

lbs

2ND

kg Use to enter and convert kilograms.

DryOz

Dry Oz use to enter and convert Dry

Ounces.

DryOz

2ND

grams Use to enter and convert grams.

Dimension Keys

Mile

Mile Use for entering or converting miles,

displayed in decimal units.

Yard

Yards Use for entering or converting yards.

Feet

Feet Use for entering or converting feet.

You may stop entry after feet or continue
by entering inches and fractions.

- 8 -

KEY PAD INFORMATION

Inch

Inch Use for entering inches. You may

continue by entering fractions. Or press
twice for decimal inches.

Fraction of an Inch Denominator keys-

They complete your fraction entries. Only
fraction inches are defined.

Mile

2ND

km Use for entering or converting

kilometers.

Yard

2ND

m Use for entering or converting meters.

Feet2ND

cm Use for entering or converting

centimeters.

Inch

2ND

mm Use for entering or converting

millimeters.

Sq

Square Use for entering square units.

Press the [Sq] key before the units key.
Example: Enter 5 [Sq] [Feet]

2ND

Sq

Cube Use for entering cubic units.

Press [2ND] [Sq] before the entering units
key. Example: Enter 5 [2ND] [Sq] [Feet]

1

2ND

Bd Ft Use for entering or converting board

feet.

/ 2

/ 4

/ 8 / 16

/ 32 / 64

- 9 -

KEY PAD INFORMATION

72ND

Circle is used to find the circumference

and area of a known diameter of a circle.

4

2ND

Arc is used to find the length of an arc

after diameter and angle are entered.

2ND 2

Fixed Fraction mode is used to select a

desired fraction result.

Triangle Keys

Pitch

Pitch is used to calculate the pitch (slope)

of a right triangle. Once pitch entered
continued pressing of pitch key will cycle
through Angle, Rise and Ratio.

Run

Run is used to enter or calculate.

To calculate the run, you must enter any
two of the following: rise, pitch, diagonal
(length).

Rise

Rise is used to enter or calculate.

To calculate the rise, you must enter any
two of the following: run, pitch diagonal
(length)

/ 2

/ 64

- 10 -

KEY PAD INFORMATION

Diag

Diagonal/Length is used to enter or

calculate. To calculate the diagonal/length,
you must enter any two of the following:
Rise, Run, Pitch.

Diag

2ND

Raked Wall is used to figure stud lengths

in a raked wall. Given pitch, rise and/or
run continuous pressing of Rake function
will show descending stud lengths.

H/V

Hip/Valley is used to find the lengths of

regular or irregular hip/valley rafters.
When used alone it shows the regular
hip/valley length. If an irregular pitch [2ND]
[H/V] is entered first, then the irregular
hip/valley will be shown.

H/V

2ND

Irregular Pitch is used to change the

regular pitch value for determining lengths
of irregular hip/valley and jack rafters.
To recall press [2ND] [H/V]

Jack

Jack is used once the length of the Hip

(or valley) is found. Continuous entry will
display the descending sizes of the jack
rafters until 0 is displayed. These
calculations will use a standard on center
stud spacing of 16" unless otherwise
specified. To change the OC default enter
desired dimension prior to pressing [Jack].

- 11 -

KEY PAD INFORMATION

Jack2ND

Irregular Jack is used once the length of

the Hip(or valley) rafter is found.
Entry of [2ND] [Jack] followed by
successive entry of [Jack] will display
the descending sizes of the irregular hip
(or valley) until 0 is displayed.
Continuing to press [Jack] will show the
display the regular jack rafters.

Rise

2ND

Stair is used to calculate the number or

risers, actual riser heights, riser
under/overage, number of treads, tread
overage/underage, stringer/carriage and
inclination angle-Rise and/or Run is
required. The default riser height of 71/2"
can be changed by pressing desired height
followed by [2ND] [Rise] .

Run

2ND

Tread is used to calculate the width of the

tread. The default tread width of 10" can
be changed by pressing desired width
followed by [2ND] [Run] .

To activate battery, carefully remove plastic tab from battery
compartment.

Your calculator utilizes chaining logic allowing you to carry
our successive intermediate operations using the [=] key to
finalize operations. See page 34 for Chaining

1 5

2 5

3 5

4 5

8.

28.

4.

8.

53

9 5

74

7 92

Working with Dimensions and Units

When entering dimensional values, you must always enter
the largest dimension first. When entering fractions, enter
the numerator followed by the dedicated denominator key
( [/2]  [/64] ). If an operation is performed with mixed units,
your calculator will automatically convert the result to the
units of first entry.

Addition:

Enter

1

5

Feet Inch

/ 16

7

9

5

6 1Feet Inch

12 Ft - 4 1/16 INCH

Enter

1

5

Feet756·

· 6 Feet

12.3 Ft

- 12 -

GETTING STARTED

- 13 -

GETTING STARTED

Subtract:

Enter

6 Ft - 6 3/4 INCH

Feet Inch

/ 4

9

4

131

Feet Inch 1

5

2

Enter

2

5

13 Ft - 3 INCH

Feet

7 56

2 0

· Feet

Multiply:

Enter

21.6 SQ Ft

Feet81

2·1 Feet

3

5

Enter

54 INCH

Inch81 3

3 5

Divide:

Enter

12 INCH

Inch63 3

4 5

Enter

7 Ft - 0 3/64 INCH

Feet / 3241 23

4 5

Enter

2.5

Inch5 2 Inch

4 5

- 14 -

GETTING STARTED

DEFAULT SETTINGS

Reduced Fraction Mode

Your calculator is set to Reduced Fraction mode which give
the most accurate result (to the /64th). To change your results
to a Fixed Fraction you must press [2ND] [2] and desired
denominator. The FIX icon will blink. To confirm your selection
press [2ND] again.

Example: To change to /8th fixed fraction:

Press

/ 822ND 2ND

. Your calcula-

tions will now result to the nearest /8th.

To Restore back to Reduced Fraction Mode press [2ND] [2]

Weight/Volume

The density default values are 1.5 Tons/Cu Yd, 3000 lb/Cu
Yd, and 1779.829 kg/Cu M. The density is used in calculating
weight. When using English units, the density is entered as
tons per cubic yard or pounds per cubic yard; when using
metric units, the density is entered as kilograms per cubic
meter.

You can recall the density by entering [2ND] [5]. Continuing
to press 5 causes the calculator to cycle through the various
units: Tons/Cu Yd, LB/Cu Yd and kg/Cu M. You can set a
new density by entering the weight followed by [2ND] [5].

Example: To change and work in a density of

4000 LB/CuYd.
Enter:

450

2ND

0 0

5

Display : 4000 LB/Cu Yd

- 16 -

GETTING STARTED

To convert between decimal feet and feet, inch, fractions
press the [Feet] key to cycle through them.

Key Sequence Result Displayed

Convert 1.6 feet 1.6 [Feet] 1.6 Ft

To feet, inch, [Feet] 1 Ft- 7 13/64 INCH
fraction

To convert a displayed fraction to another, only the desired
fraction key need to be pressed

Key Sequence Result Displayed

Convert 7/32" 7 [/32] 0 7/32 INCH

To /16th [2ND] [/16] 0 4/16 INCH

Area Conversions

Key Sequence Result Displayed

Convert 10.5625

10.5625 Sq Ft [Sq] [Feet] 10.5625 SQ Ft

To Square Meters [2ND] [Yard] 0.981288 SQ M

To Square [2ND] [Feet] 9812.884 SQ CM
Centimeters

- 17 -

GETTING STARTED

Volume Conversions

Key Sequence Result Displayed

Convert 9 9 [2ND] [Sq]
Cubic Meters [2ND] [Yard] 9. CU M

To Cubic Feet [Feet] 317.832 CU Ft

To Cubic Inches [Inch] 549213.7 CU INCH

Weight Conversions

Key Sequence Result Displayed

Convert 10 pounds 10 [lbs] 10. LB
To kgs [2ND] [kg] 4.535924 KG

Liquid Conversions

Key Sequence Result Displayed

Convert 10 Gallons 10 [Gal] 10. GL
To Liters [2ND] [Gal] 37.85412 L

Temperature Conversion

Key Sequence Result Displayed

Convert 104°F 104 [F°] 104. °F
To Celsius [2ND] [F°] 40. °C

- 15 -

GETTING STARTED

To store and proceed press [CE/CLR]. Your Wt/Vol. is now
set at 4000 Lb/CuYD

Construction Settings

This unit contains a set of default values that are used during
various construction calculations. These values can be
changed as required.

Setting English Metric

Stair Riser Height 7 1/2" 18.5 cm
Stair Tread Width 10" 250 cm
Raked Wall On Center 16" 60 cm
Regular Jack On Center 16" 60 cm
Weight per Volume 1.5 Tons/Yd3 1775 kg/m3

To check setting press [RCL] then desired setting.

NOTE: The Restore Defaults key [2ND] [%] restores ALL
changed values to their default values.

CONVERSIONS

Linear Conversions

Key Sequence Result Displayed

To Convert 1 Yard 1 [Yard] 1. Yd
To Feet [Feet] 3. Ft
To Inches [Inch] 36. INCH
To Centimeters [2ND] [Feet] 91.44 CM

- 18 -

GETTING STARTED

Paperless Tape Review

The Paperless Tape Review feature allows you to review up
to 20 entry steps and calculation results. The display will
show the entered or calculated value, along with the entry
step number.

Clear Calculator and enter a string of numbers
(i.e. 2 + 3 + 4 - 6 + 7 = 10)

Enter Tape Review

5

2ND

Tape

icon is activated

Display will read

Tape

06 = 10.

The [+] and [-] keys allow you to step forward and backward
through the last 20 steps entered into the calculator. After
the initial display of the result, the [+] key starts sequencing
through the series of entries and calculations starting with
the first step of the sequence. The [-] starts sequencing
through the series in the reverse order starting with the next
to last entry.

To review 2 + 3 + 4 - 6 + 7 = 10 in the forward direction

Key Sequence Result Displayed

[2ND] [=]

Tape

06= 10.

[+]

Tape

01 2.

[+]

Tape

02+ 3.

[+]

Tape

03+ 4.

[+]

Tape

04- 6.

[+]

Tape

05+ 7.

[+]

Tape

06= 10.

- 19 -

GETTING STARTED

To review in the reverse direction

Note: If more than one series of calculations have been
performed, the Paperless Tape will only review the last series
of calculations. Previous series of calculations will be deleted.

Example:

Enter Calculation Series #1:

41 2 3

1 51 1

10.

Then Enter Calculation Series #2:

Feet 42 3

3 5

Feet

3

Feet

24 CU Ft

Your paperless tape will only review the Calculation
Series #2

To exit Paperless Tape Review press

2ND ·

.

Key Sequence Result Displayed

[-]

Tape

05+ 7.

[-]

Tape

04- 6.

Etc.

- 20 -

EXAMPLE PROBLEMS

Complex Area

Determining the square feet of an L shaped room when
depth is unknown.

Enter:

RCL2ND

to clear Memory.

Enter:

Feet Inch8

9 5

1

2

3

3

5

Feet Inch

Answer: 536.8542 SQ Ft

Press:

M+

to store in memory.

Enter:

Feet

Inch

130

3

5

Feet1 0

Answer: 102.5 SQ Ft

Press:

2ND M+

(to subtract from memory) then

Press:

RCL RCL

to recall total 434.3542 SQ Ft.

NOTE: [RCL] [RCL] should only be used when you no longer
need to keep in memory otherwise use [RCL] [M+] to recall
and keep in memory.

29' 5"

10'

18' 3"

10' 3"

- 21 -

EXAMPLE PROBLEMS

Carpentry Rough Opening

Given 5 windows, each 2' 11 7/16" wide, find their overall
width if they are placed side by side in a wall.

Enter:

Feet Inch / 167

5

12

3

1

5

Answer: 14 Ft- 9 3/16 INCH

Carpentry  Joist Numbers

Find the number of joists on 16" centers needed for a 32' 4"
long room.

Enter:

Feet Inch4

61

23

4

5

Inch

Answer: 24.25
( Add 1 for the end = 25.25 and round up to 26 )

2' 11 7/16" × 5 = ??

32' - 4"

- 22 -

Costing a Concrete Walkway

To find the cost of concrete for this courtyard when the
concrete costs $50.00 per cubic yard:

Press

RCL2ND

to clear Memory.

First you must find the area of {a}  Enter:

Feet Inch5 6 3 0

3 5

Inch

Answer: 13.75 SQ Ft Press M+ to add to memory.

Find Area of {b}  Enter:

Feet Inch9 6 3 0

3 5

Inch

Answer: 23.75 SQ Ft Press M+ to add to memory.

Find Area of {c}  Enter:

Feet Inch53 0

3 5

3

Answer: 87.5 SQFt Press M+ to store in memory.

Press

RCL RCL

to recall 125 total SQ Ft

then multiply by depth

Inch4

3 5

Answer: 41.66667 CU Ft

To convert to Cubic Yards press

Yard

Answer: 1.54321 CU Yd
Press:

5 0 Cost

3

Answer: $77.16

EXAMPLE PROBLEMS

35'

30"

12'

8'

9' 6"

5' 6"

30"

b

c

a

30"

- 23 -

Squaring a Foundation

Calculate the
DIAGONAL
of this rectangle

Press:

RunFeet Inch / 2856 1

Then

Rise Diag

Feet Inch

/ 4

9 41

3

Answer: 68 Ft - 6 9/64 INCH
To convert answer to /8ths press

/ 82ND

Stair  Run Known

Build a stairway where the value of the Run (22' 5 1/4") is
known with a floor-floor height of 20' 6 1/2" using the default
riser height of 7 1/2".

Operation: Reset
Enter:

CE/CLRCE/CLR

Display: 0.

Operation: Enter floor to floor height
Enter:

RiseFeet Inch / 26 12 0

Display: RISE 20 Ft - 6 1/2 INCH

Operation: Enter Run
Enter:

RunFeet Inch / 45 12 2

Display: RUN 22 Ft - 5 1/4 INCH

EXAMPLE PROBLEMS

65' - 8 1/2"

19' - 4 3/4"

diagonal

?

- 24 -

EXAMPLE PROBLEMS

Operation: Enter Nominal Riser Height
Enter:

RiseInch / 27 1 2ND

Display: R-HT 7 1/2 INCH

Operation: Find Number of Risers
Enter:

Rise

2ND

Display: RSRS 33.

Operation: Find Actual Riser Height
Enter:

Rise

Display: R-AH 7 1/2 INCH

Operation: Find Underage/Overage of Risers
Enter:

Rise

Display: R+ / - 1 INCH

Operation: Find Number of Treads
Enter:

Rise

Display: TRDS 32.

Operation: Find Tread Width
Enter:

Rise

Display: T-WD 8 7/16 INCH

Operation: Find Underage/Overage of Treads
Enter:

Rise

Display: T+ / - 0 3/4 INCH

Operation: Find Stringer Length
Enter:

Rise

Display: STRG 30 Ft - 0 1/64 INCH

Operation: Find Incline
Enter:

Rise

Display: INC° 41.59389°

- 25 -

EXAMPLE PROBLEMS

Stairs with Unconventional Risers & Treads

Build an entryway where your rise is 3' and you require
shorter risers (5") and wider treads (3') for physically
challenged user.

Operation: Reset
Enter:

CE/CLR CE/CLR

Display: 0.

Operation: Enter Height
Enter:

RiseFeet3

Display: RISE 3 Ft - 0 INCH

Operation: Enter Riser Height
Enter:

RiseInch5 2ND

Display: R-HT 5 INCH

Operation: Enter Tread Width
Enter:

RunFeet3 2ND

Display: T-WD 3 Ft - 0 INCH

Operation: Find Number of Risers
Enter:

Rise2ND

Display: RSRS 7.

Operation: Find Height of Risers
Enter:

Rise

Display: R-AH 5 1/8 INCH

- 26 -

EXAMPLE PROBLEMS

Operation: Find Overage/Under
Enter:

Rise

Display: R+ / -  0 1/8 INCH

Operation: Find Number of Treads
Enter:

Rise

Display: TRDS 6.

Operation: Find Width of Treads
Enter:

Rise

Display: T-WD 3 Ft - 0 INCH

Operation: Find Overage/Underage
Enter:

Rise

Display: T+ / - 0 Ft - 0 INCH

Operation: Find Run Required
Enter:

Rise

Display: RUN 18 Ft - 0 INCH

Operation: Find Stringer Length
Enter:

Rise

Display: STRG 18 Ft - 2 13/64 INCH

Operation: Find Inclination
Enter:

Rise

Display: INC° 8.134744°

- 27 -

EXAMPLE PROBLEMS

Raked Wall  Stud Lengths

Find the stud lengths in the raked wall with a peak of 7'5"
and length of 14' 8" (using the 16" default OC).

Operation: Reset
Enter:

CE/CLR CE/CLR

Display: 0.

Operation: Check OC Default
Enter:

DiagRCL 2ND

Display: OCTR 16 INCH

Operation: Enter Run
Enter:

RunFeet Inch841

Display: RUN 14 Ft - 8 INCH

Operation: Enter Rise
Enter:

RiseFeet Inch7 5

Display: RISE 7 Ft - 5 INCH

Operation: Find Length of Longest Stud
Enter:

Diag2ND

Display: RW1 6 Ft - 8 29/32 INCH

Operation: Find Length of Second Stud
Enter:

Diag2ND

Display: RW2 6 Ft - 13/16 INCH

Operation: Find Length of Third Stud
Enter:

Diag2ND

Display: RW3 5 Ft - 4 47/64 INCH

NOTE: Continue until you have last stud. To convert

result to /16th press [2ND] [/16]

- 28 -

EXAMPLE PROBLEMS

Board Feet Lumber

Find the total cost for eight 2 inch x 4 inch x 12 foot piece
of lumber when the unit price is $1.60/Bd Ft.

Enter:

4 12 2ND

3 3

2 1

Answer: 8. B Ft

Then press:

8

3 5

Answer: 64. B Ft

Then press:

61 · Cost

3

Answer: $102.40

Remember: 1 board foot is 144 cubic inches or 0.08333
cubic foot of lumber, conversions can only be done to and
from other cubic measurements.

Circle Solutions

After entering the diameter of a circle, the Circle function is
used to find the circumference and area of a circle. After
finding the circumference of a circle, the area of the circle
may be found by entering [7] a second time. Entering [7] a
third time displays the circle diameter.

Circumference & Area

To find the circumference and the area of a circle whose
diameter is 10 inches.

- 29 -

EXAMPLE PROBLEMS

Enter Display

Inch 71 0 2ND

DIA 10 INCH

7

CIRC 31 27/64 INCH

7

AREA 78.53982 SQ INCH

Arc Length

The Arc function is used to find the length of an arc. Note
that the circumference will display as soon as [2ND] [7] is
pressed, and will remain on the display until [2ND] [4] is
pressed. To find the arc length of an 85° arc whose diameter
is 5 inches.

Enter Display

Inch 75 2ND

DIA 5 INCH

8 45 2ND

ARC 3 45/64 INCH

Simple Concrete Footings

Determine how much cement is needed to pour 5 concrete
footings that have an 8 inch diameter and are 12 inches
deep.

Enter Diameter by pressing

Inch 78 2ND

Find surface area by
continuing to press the

7

key twice.
Answer: AREA 50.26548 SQ INCH
Then compute volume

by entering:

Inch1 2

3 5

Answer: 603.1858 CU INCH

- 30 -

EXAMPLE PROBLEMS

Then multiply:

5

3 5

Answer: 3015.929 CU INCH

Convert to feet
by pressing:

Feet

Answer: 1.745329 CU Ft

Concrete Weight/Volume

Determine the weight and volume for this concrete patio.
Use default 1.5Tn/Cu Yd and depth of 6"

First check weight/volume default by pressing [2ND] [5].
If not 1.5 Tn/Cu Yd see Default Section

Enter:

Feet Inch8

5 6

13

3

5

3 3

Feet Inch

3

Inch

Answer: 225.8472 CU Ft

Convert to Cubic yards: Press

Yard

Answer: 8.364712 CU Yd

To determine weight: Press

82ND

Answer: 12.54707 Tn

33' 8"

13' 5"

- 31 -

Roof Rise

Given any two - pitch, rise, run or diagonal  will automatically
solve for the other two. Here is a useful calculation in determin­ing wall heights. This example will figure the RISE of a roof
knowing the PITCH is 4 in 12 and the RUN is 13' - 2 3/8"

Remember: The PITCH of a roof equals its RISE in INCHES
over a RUN of 12" thus a 4/12 roof has a SLOPE of 4".
(when entering SLOPE always use inches) In Metric  pitch
is expressed in millimeters over 1,000 millimeters of run.

Enter Display

PitchInch4

PTCH 4 INCH

Run

Feet

Inch / 8

1 23

3

RUN 13 Ft - 2 3/8 INCH

Rise

RISE 4 Ft - 4 51/64 INCH

Diag

DIAG 13 Ft - 10 15/16 INCH

Pitch

PTCH 4 INCH

Pitch

PTCH 0.333333 (In Ratio)

Pitch

PTCH 18.43495°

EXAMPLE PROBLEMS

rise

Run = 13 2 3/8

Rise = ??

4

Pitch

12

run

- 32 -

EXAMPLE PROBLEMS

Roof Pitch  Given Rise & Run

Enter Display

RiseFeet Inch86

RISE 6 Ft- 8 INCH

RunFeet2 0

RUN 20 Ft- 0 INCH

Pitch Pitch

PTCH 4 INCH

Remember: Pitch is always rise in inches over a run of 12
inches.

Regular Hip/Valley & Jack Rafter

When two roofs are perpendicular (90°) to each other and
have the same pitch, they meet at a 45° angle. This is known
as a regular condition.

Given a run of 12' and a rise of 6' calculate common rafters,
hip/valley rafters, hip jack/valley jack rafters. Standard on­center spacing is assumed.

Operation: Rise
Key Sequence:

RiseFeet6

Display: RISE 6 Ft- 0 INCH

rise

Run = 20 0

Rise = 6 8

Pitch = ??

12

run

- 33 -

EXAMPLE PROBLEMS

Operation: Run
Key Sequence:

RunFeet1 2

Display: RUN 12 Ft- 0 INCH

Operation: Common Rafter
Key Sequence:

Diag

Display: DIAG 13 Ft- 5 INCH

Operation: Hip Rafter Length
Key Sequence:

H/V

Display: H/V 18 Ft- 0 INCH

Operation: Jack Rafter Lengths
Key Sequence:

Jack

Display: RJ 1 11 Ft- 11 7/64 INCH

Key Sequence:

Jack

Display: RJ 2 10 Ft- 5 7/32 INCH

Key Sequence:

Jack

Display: RJ 3 8 Ft- 11 21/64 INCH

Key Sequence:

Jack

Display: RJ 4 7 Ft- 5 7/16 INCH

Continuous entry of [Jack] will display the descending sizes
of the jack rafters until 0 is displayed.

- 34 -

EXAMPLE PROBLEMS

Irregular Hip/Valley & Jack Rafter

When the pitch of a main roof and the pitch of the adjacent
roof are not the same, this is referred to as irregular and
we calculate the regular (main roof) and irregular (hip or
gable) values.

Given a main roof with a run of 12' and a pitch of 6" and the
hip roof with a pitch of 8", calculate the common rafter, hip
rafter, irregular hip/common rafter, irregular and irregular hip
jack rafters. (standard on-center spacing applies to main
roof and 18" on-center spacing applies to hip roof) Fix Fraction
to /8ths.

Operation: Change Fixed Fraction
Key Sequence:

/ 822ND 2ND

Display:

Fix

0.

Operation: Run
Key Sequence:

RunFeet1 2

Display:

Fix

RUN 12 Ft- 0 INCH

Operation: Regular Pitch
Key Sequence:

PitchInch6

Display:

Fix

PTCH 6 INCH

Operation: Irregular Pitch
Key Sequence:

H/VInch8 2ND

Display:

Fix

IPCH 8 INCH

Operation: Common Rafter
Key Sequence:

Diag

Display:

Fix

DIAG 13 Ft- 5 INCH

- 35 -

EXAMPLE PROBLEMS

Operation: Rise
Key Sequence:

Rise

Display:

Fix

RISE 6 Ft- 0 INCH

Operation: Regular Jack OC Spacing
Key Sequence:

Jack

Inch61

Display:

Fix

R-OC 16 INCH

Operation: Irregular Jack OC Spacing
Key Sequence:

JackInch81 2ND

Display:

Fix

IROC 18 INCH

Operation: Find Irregular Jack Rafters
Key Sequence:

Jack2ND

Display:

Fix

IJ 1 9 Ft- 5 5/8 INCH

Key Sequence:

Jack

Display:

Fix

IJ 2 8 Ft- 1 3/8 INCH

Key Sequence:

Jack

Display:

Fix

IJ 3 6 Ft- 9 1/8 INCH

Continue to press [Jack] until 0 is displayed. Then continuing
to press [Jack] will cause unit to cycle thru the regular jack
rafters

Key Sequence:

Jack

Display: RJ 1 11 Ft- 5 1/8 INCH
Key Sequence:

Jack

Display: RJ 2 9 Ft- 5 2/8 INCH

Continue to press [Jack] until 0 is displayed.

- 36 -

REFERENCE

Chaining

Your calculator utilizes chaining logic allowing you to carry
out successive intermediate operations using the [=] key to
finalize operations. Since the chaining logic works from left
to right, you must use care when combining operation such
as addition and multiplication by first addressing operations
within brackets.

Example: 1 + 2 x 3 + 4 = 13 Enter the values and operators
as they are written and press [=] to get the answer.

Example: (1 + 2) x (3 + 4) = 21

Enter 1 [+] 2 [=] [M+]
Then enter 3 [+] 4 [x] [RCL] [M+] [=]

NOTE:
To recall and remove from memory press [RCL] [RCL].
To recall & keep in memory storage press [RCL] [M+].

Error/Overflow

An error/overflow condition occurs when the result of a
calculation has more than 7 digits to the left of the decimal
point, or when you attempt to divide a value by zero or
calculate mixed units that are not alike. An Error condition
is indicated by the "Error" displayed. You must clear the
calculator display by pressing [CE/CLR] before continuing
operations. Clearing an Error condition will not clear
values stored in the memory registers.

Auto-Range

If the input or calculation result with small units is out of the
7 digit range of the display, the answer will be expressed in

- 37 -

REFERENCE

the next larger units instead of showing "Error"

Care

Dont leave calculator in direct sunlight for long periods, or
store it where excessive temperatures are possible. Dont
leave the calculator on when not in use (NOTE- To save the
battery, calculator will turn off automatically after 10-12
minutes of inactivity, at which time the displayed value and
memory contents will be cleared.

Battery

This unit requires one 3V lithium battery (CR2032 or
equivalent). The average battery operating life is 2000 hours.
When the display slows down and/or becomes dim, it is time
for a new battery.

To change the battery

1.) Turn power off.

2.) Remove screw from battery lid & slide cover off.

3.) Before removing the battery, be sure to touch a metal
object. This is to avoid any accidental discharge of
static electricity, which may harm the circuit board.

4.) Install new battery with the (+) side up.

Resetting Your Calculator

To reset your calculator, turn unit over and see RESET.
Press with point of ball point pen. You calculator is now reset.

NOTE: RESETTING YOUR CALCULATOR WILL ERASE
ANYTHING IN MEMORY OR PAPERLESS TAPE.

- 38 -

APPENDIX

Conversion Tables

1 square inch = 6.4515 sq centimeters
1 square foot = 144 square inches
1 square foot = 0.92903 sq meters
1 square yard = 9 square feet
1 square yard = 0.836127 sq meters
1 cubic inch = 16.3871 cu centimeters
1 cubic foot = 1728 cubic inches
1 cubic foot = 0.02831 cu meters
1 cubic yard = 27 cubic feet
1 cubic yard = 0.76455 cu meters
1 mile = 5,280 feet
1 mile = 1.609344 kilometers
1 acre = 43,560 square feet
1 ounce = 28.349532 grams
1 pound = 0.4535924 kilograms
1 (U.S.) gallon = 3.7854118 liters
1 (U.K.) gallon = 4.546090 liters
1 fluid ounce = 29.574 milliliters
Fahrenheit = 9/5 (C) + 32
Centigrade = 5/9 (F - 32)
pi (p) = 3.141593

- 39 -

APPENDIX

Area Formulas

Circle

Triangle

Sphere

Cylinder

ab

2

r

a

b

r

I

r

p r

2

4p r

2

2p r(r+I)

- 40 -

APPENDIX

Volume Formulas

Sphere

Cylinder

Cone

4p r

3

3

p b2 a

12

r

I

a

b

r

p r2I

- 41 -

APPENDIX

Lumber Sizes

Normal Size Actual Size (S4S)

1" x 2" 3/4" x 1 1/2"
1" x 3" 3/4" x 2 1/2"
1" x 4" 3/4" x 3 1/2"
1" x 6" 3/4" x 5 1/2"
1" x 8" 3/4" x 7 1/4"
1" x 10" 3/4" x 9 1/4"
1" x 12" 3/4" x 11 1/4"

2" x 2" 1 1/2" x 1 1/2"
2" x 3" 1 1/2" x 2 1/2"
2" x 4" 1 1/2" x 3 1/2"
2" x 6" 1 1/2" x 5 1/2"
2" x 8" 1 1/2" x 7 1/4"
2" x 10" 1 1/2" x 9 1/4"
2" x 12" 1 1/2" x 11 1/4"

4" x 4" 3 1/2" x 3 1/2"
4" x 6" 3 1/2" x 5 1/2"
4" x 8" 3 1/2" x 7 1/4"
4" x 10" 3 1/2" x 9 1/4"
4" x 12" 3 1/2" x 11 1/2"

CUSTOMER SERVICE

TECHNICAL ASSISTANCE

If you have any questions or need technical
assistance, e-mail to:

CUSTOMER SERVICE

SONIN takes pride in offering unmatched customer
service to owners of SONIN products. If you have
any questions or would like additional information,
please call:

or e-mail to:

[e-mail]

1 - 800 - 223 - 7511 (USA)

[e-mail]

- 43 -- 42 -

APPENDIX

FCC Statement

This device has been tested and found to comply
with the limits for a Class B device, pursuant to
part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against
harmful interference in a residential installation.
This device generates, uses and can radiate radio
frequency energy and, if not used in accordance
with the instructions, may cause harmful
interference to radio communications. However,
there is no guarantee that interference will not
occur in a particular installation. If this equipment
does cause harmful interference to radio or
television reception, which can be determined by
turning the device off and on, the user is
encouraged to try to correct the interference by
one or more of the following measures:

- Reorient or relocate the receiving antenna

- Increase separation between the device and
receiver

The Measure of Excellence

®