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CALC 1 Overview

CALC 1 uses multiple calculators so each calculator has the most important keys for that task on the top row.

Focused Calculators

Each Focused Calculator has a different set of keys on the top row, with the SHIFT, STO and RCL keys related to the keys on the top row. Each Focused Calculator has it's own documentation.

The index of all Focused Calculators can be found here.

Formula Calculators

The top row of the Formula Calculators are for a single formula. The top left key (under the CALC 1 button) evaluates that formula. The other keys on the top row are for storing the parameter values.

The index of all Formula Calculators can be found here.

See the Formula Calculators General Help for details.

Form Calculators

Form Calculators let you view all of the values and labels at once. They share values with their corresponding Focused Calculators so you can easily switch between them without having to re enter values.

The index of all Form Calculators can be found here.

Key Preview

For the TVM calculators and all Formula Calculations the value that is stored, recalled or calculated is displayed on the key under the label. Also tapping the STO or RCL key will display the value for the storage variable.


To help you with the hundreds of solutions CALC 1 provides, there are hints for every key.

diplay showing hint

To see a key's function, touch and hold the key and a hint will appear in the display. Drag your finger completely off the key if don't want to execute the command, otherwise just lift your finger and the command will be executed.


If you make a mistake you can undo the last command. You can press the RCL key, located at the bottom left corner, and if there is an undo action available, you will see it on the wide x() (ENTER in RPN mode) key. Press the STO key for a redo action if available.


Tap three

to open the CALC 1 help page for that calculator. An internet connection is required.

There are also help buttons for most forms.

At the top of every page there is a search field to help find anything on the site.

If you cannot find an answer on the documentation site, use the Contact link.

Calculation Modes

From Options you can choose chain (CHN), algebraic (ALG) or reverse polish notation (RPN) as the calculation mode.

Display Format of Numbers

CALC 1 display options can be set in the Options view. You have the 3 number styles (None, Decimal and Scientific), the number of digits and rows to display.



display of an error

If you make an error, the display will show a message describing the error. Press the back button key to clear the error message.

The History Details will show you more information if needed.

Navigating CALC 1

CALC 1 used standard iOS navigation. Pressing the back button button on the upper left corner of a calculator will navigate back to the list of calculators.

On the iPad, the navigation is on the left side of the display when in landscape. In portrait, swipe the top toolbar to see the navigation menu.

Calculator Lists

In addition to selecting calculators, you can tap the info button to edit the calculator. The edit button on the Calculator List allows you to reorder the list or add new calculators.

Reordering your calculator list makes it easier to use the "swipe" gesture to quickly switch between your favorite calculators.

You can check the Downloads for new calculators and updates.


iphone toolbar

The iPhone toolbar has shortcuts to the Currency and UOM form calculators and the utility views for the History, List Manager and Options.

On the iPad, you can access the conversion form calculators from the CALC 1 button and the utility views from the split view in landscape.

The Display

In algebraic calculation mode the formula is above the result, x().