powerOne calculator works in both algebraic and RPN input modes. It includes input and output of numbers in real (decimal), scientific, engineering, fraction and feet-inch formats and includes a wide array of math functions, from basic math, powers, and trig to programmer's math, matrices and complex numbers. Details about input modes, number types and math functions is available by selecting the '?' Help icon in the top, right corner of the calculator and then choosing "Examples".

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


On the iPhone and iPod touch there are four keypads: primary, math, advanced and history. (Primary is always visible in landscape calculator.) Select each icon below the calculator frame to move between keypads. The math keypad includes power and log functions. The advanced keypad includes a customizable keypad and access to all advanced math functions via the "more" button. The history keypad includes both a calculation log and memory locations. The advanced keypad, 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 advanced. Math tab displays power and log functions while the advanced tab displays a customizable keypad and access to all advanced math functions via the "more" button. Advanced math keypad, history and memory are described below.

Math Functions

powerOne includes over 150 math functions that can be used with the calculator, and even more that can be used with template creation. See the Math Functions section for details on all available math functions.

View Window, Moving the Cursor & Copy/Paste

The view window is where numbers, math functions and symbols appear as you select buttons. In algebraic mode it displays the entire expression and, when you select '=', the result. In RPN mode it displays the stack of results, which can be scrolled to show stack items that have scrolled off the top.

To adjust a number either use the backspace key or select down on the cursor and drag to the desired location. In algebraic mode you can move the cursor anywhere within the equation or result. In RPN mode the cursor can be moved within the currently entered stack item only.

Selecting down on the cursor and releasing will display a menu for copy and paste. In algebraic mode, copy copies the entire view window's contents and paste inserts the clipboard's contents at the cursor position. In RPN mode, copy copies the bottom item on the stack while paste creates a new stack item. 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 powerOne.

Advanced Keypad

The advanced keypad is customizable. Select the "more" button and choose a keypad at the top. In addition, all math functions are listed below the keypads in the "more" list. Select any one to perform its function. This list also includes a brief description for how to enter each function. While the display is designed for algebraic notation, it also indicates the correct order of entry for RPN mode. Push values onto the stack in left-to-right order. For instance, 3^4 in algebraic mode is pushed as 3 [ENT] 4 [^] in RPN.

The function list and keypads include functions ranging from powers, logs and trig to programmer's math, complex numbers and matrices. All functions are included with the Pro editions of powerOne. The Lite editions include powers, logs, trig and hyperbolic. All functions can be purchased by selecting the cart button in the lower, left corner of the template list.

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 (algebraic mode) or create a new stack item (RPN mode). To store to a memory location, select the STO button on the desired row. Algebraic mode will store the contents of the view window, whether equation or results. RPN mode will store the last stack item.

LAST is a special variable used in algebraic input mode. Since Algebraic input mode 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 include:
  • Theme: choose between three available calculator "skins"
  • Input Mode: swap between algebraic and RPN modes.
  • Keyboard: impacts the buttons available by default on the math keypad. All additional functions available in the advanced keypad by selecting the "more" button.
  • Display Mode: displayed output format for each result type. See Toggle section for more information.
  • Precision: real, scientific, engineering and complex number precision includes Float (see as many decimal places as possible) and 0 through 10 places. Fraction rounds the denominator to 1 through 4 places (x, xx, xxx, xxxx), 2, 4, 8, 16, 32, 64, 10, 100 or 1000. Feet-inch rounds the denominator for the fractional inches to 2, 4, 8, 16, 32 or 64. For fractions and feet-inches, powerOne will round to the desired setting and then reduce to the lowest common denominator.
  • Trig Mode: choose between degrees and radians mode for trigonometric math functions.
  • Key Clicks: turn on or off the keypad key click noise for the calculator, number editor and table editor.
In addition there are application wide settings in Apple's Settings app. Numbers can either be displayed in 1,000.00 or 1.000,00 format and the noise made by selecting buttons in the calculator (called Key Clicks) can be turned off.


Toggle (⇆ button) rotates between different display modes for various results. Find the toggle button in the math tab for each keyboard mode. Options include:
- Numbers: real (3.5) and fraction (3&1/2)
- Lengths: feet-inch as fractions (3'6&1/2"), decimal feet (3.5417'), fractional inches (42&1/2") and decimal inches (42.5")
- Areas: feet (3.5ft^2) and inches (504in^2)
- Volumes: feet (2.3ft^3) and inches (3974.4in^3)
- Integer: binary (101_b), octal (17_o), decimal (43_d) and hexadecimal (0A5_h or 5F_h)
- Complex: rectangular (3;4) and polar (3;@4)

For instance, to see the result of 3.125 + 3.5 as a fraction, perform the math then select the toggle button until a result of 3&5/8 appears. Note that the toggle setting will retain the last used output until you select the toggle button again.

Calculator-Template Integration

The number editor 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.