The calculator is available by selecting the calculator icon in the top bar of the list or template.

Entering Numbers

Numbers are entered by selecting keys on the keypad. Numbers are built from left-to-right, one key at a time. The only exception is to change the sign of a number. [±] can be selected at any time.

Units use [&] to separate whole and fractional inches and [/] to separate numerator and denominator in those fractional inches. To enter area or volume units, select [ft] or [in] button first then choose the ² or ³ option for that type. Use backspace to remove the designation.

Examples are as follows (brackets indicate buttons):

Real Numbers:

[3] [ . ] [5] to enter 3.5
[3] [ . ] [5] [±] to enter -3.5


[3] [6] [in] to enter 36 inches
[3] [ft] to enter 3 feet
[3] [ . ] [5] [ft] to enter 3.5 feet
[3] [ft] [4] [in] to enter 3 feet, 4 inches ([in] is optional)
[3] [ft] [4] [&] [1] [/] [2] [in] to enter 3 feet, 4 and 1/2 inch ([in] is optional)
[3] [ . ] [5] [in] [in²] to enter 3.5 square inches
[1] [0] [ . ] [5] [ft] [ft³] to enter 10.5 cubic feet

In the last two examples notice how selecting [in] or [ft] button then offers an additional set of options, including the area and volume buttons. The others are conversions, discussed in the Unit Conversions section below.

Performing Math

Math functions either require two numbers (two-variable) or one number (one-variable). Two-variable functions, such as addition and subtraction, take two numbers to calculate while one-variable functions, such as square root and reciprocal (1/x), require only one number.

Two-Variable Functions

To calculate 3 + 4 × 7, enter the following:

[3] [+] [4] [×] [7] [=] displays 31

Notice that 3 + 4 didn't calculate until after 4 × 7 completed. This calculator follows order of operations, which says that multiplication and division should happen before addition and subtraction. Use parentheses to change the order of operations. A full chart is below:

[ ( ] [3] [+] [4] [ ) ] [×] [7] [=] displays 49

Two-variable functions include:
  • Addition: [8] [+] [3] [=] displays 12
  • Subtraction: [8] [−] [3] [=] displays 5
  • Multiplication: [8] [×] [3] [=] displays 24
  • Division: [8] [÷] [3] [=] displays 2.67
  • Power: [3] [yᕽ] [4] [=] displays 81 (3 to the 4th power)
  • Root: [8] [ᕽ√y] [3] displays 2 (3rd root of 8)
  • Percent Change: [30] [ch%] [10] [=] displays 33 (30 + 10% of 30) or [30] [ch%] [±] [10] [=] displays 27 (30 − 10% of 30)

One-Variable Functions

One-variable functions, such as square root and sine, operate on the value currently displayed in the view window. One-variable functions include:
  • Reciprocal: [5] [1/x] [=] display 0.2
  • Square: [5] [x²] displays 25
  • Square Root: [2] [5] [√x] displays 5
  • Natural Log: 4 [ln] displays 1.39
  • Natural Anti-Log: 2 [exp] displays 7.39
  • Trig Functions: 30 [sin] displays .5 (degrees mode) or -0.988 (radians mode)

Unit Conversions

To convert between unit types enter a unit then choose an alternative unit. For instance, entering 3ft offers both options to make the number an area or volume as well as options to convert the value to an inch or feet-inch result. Selecting [in] will convert 3ft to 36in while selecting [ft-in] will convert the result to a feet-inch value, 3ft 0in. The following conversions are available:
  • Feet: convert to decimal inches or feet-inches where the inches are always displayed as a fraction. If there are a whole number of feet then 0in is displayed as the number of inches.
  • Inches: convert to decimal feet or feet-inches where the inches are always displayed as a fraction. If there are 0 feet then that foot portion of the number is not displayed.
  • Feet-Inch: convert to decimal feet or decimal inches.
  • Square Inches: convert to decimal square feet.
  • Square Feet: convert to decimal square inches.
  • Cubic Inches: convert to decimal cubic feet.
  • Cubic Feet: convert to decimal cubic inches.
Examples are as follows (brackets indicate buttons):

[3] [ft] [in] displays 36in
[36] [in] [ft] displays 3ft
[5] [ft] [3] [&] [1] [/] [2] [in] [in] displays 63.5in
[7] [2] [.] [2] [5] [in] [ft-in] displays 6ft 1/4in
[8] [ft] [ft²] [in²] displays 1152in²
[5] [1] [8] [4] [in³] [ft³] displays 3ft³


To save a result for future calculation, select [sto] (store) button. To recall that result in a future calculation, select [rcl] (recall) button.

Clearing Results/Values

Selecting ⊗ (clear) button in the view window clears the currently entered value or result, depending on the state of the calculation. When in the middle of entering a value, selecting clear will clear only the current value. The calculation remains intact and can be continued by entering a different value.

Selecting the clear button after a math function or equals button has been selected will clear the entire calculation. Selecting the clear button twice will always ensure that the current calculation has been cleared for a new calculation.


The view window in portrait mode offers three setting options (from left-to-right): decimal setting (dec-), trig mode (deg, rad) and math functions (math). In landscape these appear as buttons in the top row on the left. Select each to change its setting.

Decimal Setting

Select the decimal setting text to change it. The decimal setting print-out starts with "dec-" and is finished by the setting itself, "0" through "9" or "flt" for float mode.

The float decimal setting shows all available places, 0 through 9 display that number of fixed places.

Trig Mode

Select "deg" or "rad" to change the trig mode. Choose between degrees ("deg") or radians ("rad").

Math Functions

While the primary keypad is fixed, always showing basic math and number pad keys, the top two rows in portrait mode and middle two rows on the left in landscape can be changed. Options include standard functions, units, powers, logarithms, trigonometric and hyperbolic functions.

Order of Operations

Highest to lowest precedence. Higher precedence items occur before lower precedence items. Use parentheses to change the order of operations:
  1. One-Variable Functions
  2. Percent Change
  3. Power, Root
  4. Multiplication, Division
  5. Addition, Subtraction