Templates combine the what-if scenario analysis power of a calculator with the visual effect and easy entry of a simple spreadsheet. Each row of a template consists of three elements: a label, a value and an equals button (if the row can be computed).

Each template is available by selecting its title in the Template List.

Basic Functionality

To perform a computation enter the data you know then select the equals button on the row you don't. Enter data by selecting the desired row and entering its data in the displayed editor.

To calculate select the equals button on the desired row. In some cases, however, powerOne can successfully predict what needs to be calculated. As each row is entered the equals button turns gray to indicate that it is known data. If enough data is known it will calculate automatically. (If powerOne is wrong you can override the calculator by selecting a grayed out equals button.)

Also note that some rows have beige backgrounds. This indicates that these rows are read-only.

Data Types

There are six kinds of data available: Numbers, Tables, Dates, Lists, Text and Equations. Number rows can either be decimal numbers, fractions or feet-inch.

Each type has its own editor. Enter a number then select Save to save to the template. In addition on iPad you can select outside the editor to save. Cancel will throw out any changes. See the Data Types section for additional details on data entry.

The number editor -- for decimal, fraction and feet-inch entry -- also offers basic math capabilities. It uses the same input mode as the calculator (algebraic or RPN input). Select the "math" button to see available functions. In addition the number editor also has a button labeled "show". This button displays the full precision of calculated, rounded results. See Calculation Accuracy section below for details. Finally on an iPhone or iPod touch, the landscape calculator and number editor are integrated. See calculator for details.

Amortization Tables

Some templates, such as Time Value of Money and Mortgages, includes an Amortization Table row. Select it to display a full amortization table. When a template is shared, the amortization table is included as an attachment.


Some templates, such as Summary Data, Two-Variable Statistics, and Savings, include graphing. Others, such as Function Graph, are designed specifically for that purpose. Enter in the appropriate equations or data, calculate, then select the graph row to see data visually. See the Graphing section for details.

Calculation Accuracy

The decimal places displayed in the template is different from the decimal places stored in the application to ensure calculation accuracy.

For many template results you can see the full precision. Display it in the number editor then click 'show' once to show the full precision of the displayed value. Click it again to revert back to the displayed row's precision. (In fact, this button will also act as an undo, taking you back to the previously stored result.)


  • New: returns the template results to its default values. Also stores the previously entered and calculated data to history.
  • Favorite: select the empty star to designate this template as a Favorite. See the Categories section for additional information.
  • Sync: manually updates the currency data. See below for details.
  • History: access the calculation history for this template.
  • Send: email the template and its results.
  • Edit: edit or review the template's source code.
  • Help: view template descriptions and examples.
The Edit button may not be visible depending on the template author's wishes. Templates you create or receive via email can be edited. However, templates included in powerOne or downloaded from the Library are read-only. The template creator has the option of sharing source code or not.

Sync also may not be visible if the template does not use currency data. The sync option is available for manual update if the application's setting for Update Data is OFF. (This setting is available in the device's Settings app.) Normally powerOne will automatically check for and update currencies once per day (3am GMT/7pm PST). The data is provided by multiple sources. Because the data represents the previous day's rates, the previous day's date will appear in the Currency template.