The calculator is available by selecting "Calculator" in the List. On the iPhone there is also a landscape version of the calculator. Rotate to landscape orientation from the List, Calculator or any template to access it.

This information, number entry information and function examples are all available by selecting ? button in the calculator.

Entering Numbers

Real Numbers:

3.5 or -3.5
3.5E3 or 3.5E-3
-3.5E3 or -3.5E-3


3&1/2 or -3&1/2
1/4 or -1/4


36" [36 inches]
3' [3 feet]
3.5' [3.5 feet]
3'4 [3 feet, 4 inches]
3'4" [3 feet, 4 inches]
3'4&1/2 [3 feet, 4 and 1/2 inch]
3'4&1/2" [3 feet, 4 and 1/2 inch]
3'4.5 [3 feet, 4.5 inches]
3.5in² [area]
3.5ft² [area]
10.5in³ [volume]
10.5ft³ [volume]

See Data Types for additional details.


On the iPhone and iPod touch there are four keypads: primary, math, trig and history. (Primary is always visible in landscape calculator.) Select each icon below the calculator frame to move between keypads. The math keypad includes measurement, power and log functions. The trig keypad includes trigonometric and hyperbolic functions. The history keypad includes both a calculation log and memory locations. History and memory are described below.

On the iPad there are four tabs and the primary keypad is always visible. The four tabs, from left to right, are history, memory, math and trig. Math tab displays power and log functions while the trig tab displays trigonometric and hyperbolic functions. History and memory are described below.

View Window, Moving the Cursor & Copy/Paste

The view window is where numbers, math functions and symbols appear as you select buttons. To perform mathematics, enter the entire expression and select '=' button to return a result.

To adjust a number either use the backspace key or select down on the cursor and drag to the desired location.

Selecting down on the cursor and releasing will display a menu for copy and paste. Copy copies the entire view window's contents and paste inserts the clipboard's contents at the cursor position. Copy and paste are available in the calculator and the template's number editor. The clipboard functions across the iOS device so copy and paste work within and outside of the app.

History & Memory

The calculator includes two types of storage. History (calculation log) includes a log of previous entries and calculations while memory includes 10 locations to store any numbers or equations. See the Keypad section above for details on accessing them.

Select a row to recall it to the cursor position in view window. To store the view window's contents, select the STO button on the desired memory location.

LAST is a special variable. The calculator evaluates based on what is actually displayed on the screen, rounded results create inaccurate follow-on results. For instance, 1/3 = is .333 but the rounded result means multiplying by 3 will leave a result of .999 instead of 1. LAST retains the full precision of the previous result, which is more complete than the history result or the result displayed in the view window. LAST can be returned by selecting its button in the history keypad.

To clear the history and/or memory locations, select the grey 'x' button in the history keypad on the iPhone or iPod touch or select either the history or memory tab twice on the iPad.


Select the gear icon (button) in the top, right corner to change the calculator settings. Settings are broken into three groups:


  • Keyboard: different calculation types offer different keyboard configurations. Default is feet-inch (ft-in). The current keyboard has no impact on the kinds of math that can be performed. For instance, ft-in keyboard can still perform real and fractional math.
  • Real: whether real number results should be displayed in decimal or fractional format.
  • Length: whether length results should be displayed in feet-inch format, decimal feet format, fractional inch format or decimal inch format.
  • Area: whether area results should be displayed in decimal square feet or decimal square inch format.
  • Volume: whether volume results should be displayed in decimal cubic feet or decimal cubic inch format.


  • Decimal: displayed number of places for decimal results. Float shows all available places, 0 through 10 display that number of fixed places.
  • Fraction: rounded denominator for fractional results. The calculator rounds to that numerator and then reduces to the lowest common denominator. Options include 2, 4, 8, 16, 32 or 64.
  • Feet-Inch: rounded denominator for fractional inch results. The calculator rounds to that numerator and then reduces to the lowest common denominator. Options include 1 through 4 places (x, xx, xxx, xxxx), 2, 4, 8, 16, 32, 64, 10, 100 or 1000.


  • Trig Mode: choose between degrees and radians mode for trigonometric math functions.
  • Key Clicks: hear or mute the sound made when clicking keyboard keys. This affects the calculator and templates.

Calculator-Template Integration

The number editor in the templates and landscape calculator are integrated together. When the number editor is displayed, rotate your iPhone or iPod to landscape mode to access the calculator. The template row's result is available via the "T" memory location and any calculations are automatically inserted back in the number editor when rotating back to portrait mode. This feature is not available on the iPad. Instead either use copy/paste or the math capabilities built into the number editor.