About Custom Formulas
This powerful app lets you create your own custom formulas and then perform computations using them by prompting you for the input values. This app is easy to use, but unlike simpler apps, multiple entered values can be...
This powerful app lets you create your own custom formulas and then perform computations using them by prompting you for the input values.
This app is easy to use, but unlike simpler apps, multiple entered values can be fed into multiple formulas and multiple output values can be displayed. The output of one formula in a group can be fed into the next by using the same variable name.
Related formulas can be grouped into categories to make them easy to find. e.g. Maths formulas, Surveying formulas, Loan interest formulas etc.
The order of variables displayed to the user can be changed, as can the number of decimal digits of precision shown in the output fields.
Three example formulas are pre-installed with the app. In order of increasing complexity they are: slope percentage, compound interest, and point scale factor. There are also a growing number of formulas available to easily download directly in the app from a web sharing hub. Current categories include health, finance, and surveying.
A formula group can be exported or emailed, allowing you to share your creations with other users of the app.
The results from multiple computations using the same formula can be saved to a CSV file for later viewing in a spreadsheet. You can also choose to compute the sum of the formulas for a range of values of one of the input variables using the sigma button.
In addition to evaluating formulas, there is also a calculator tool and a linear equation solving tool on the main page menu.
You can view the online help here: https://www.binaryearth.net/CustomFormulasHelp/
Previous Versions
Here you can find the changelog of Custom Formulas since it was posted on our website on 2016-10-08 07:49:41.
The latest version is 9.6 and it was updated on 2026-10-18 11:35:45. See below the changes in each version.
Custom Formulas version 9.6
Updated At: 2026-09-14
Changes: 9.6: Updated to target Android SDK 36.
9.5: Bug fix.
9.4: Fixed issue with file association.
9.3: Updated to target Android SDK 35.
9.2: Fixed a bug with file association for .cf files.
9.1: Allow entry of formulas in Linear Solver without having to insert *'s between coefficient and variable name.
9.0: Updated calculator tool.
8.9: Updated to target Android SDK 34.
8.8: Updated to target Android SDK 33.
8.7: Bug fix.
8.6: Added min(), max(), and avg() functions which each take two values.
Custom Formulas version 9.5
Updated At: 2026-06-25
Changes: 9.5: Bug fix.
9.4: Fixed issue with file association.
9.3: Updated to target Android SDK 35.
9.2: Fixed a bug with file association for .cf files.
9.1: Allow entry of formulas in Linear Solver without having to insert *'s between coefficient and variable name.
9.0: Updated calculator tool.
8.9: Updated to target Android SDK 34.
8.8: Updated to target Android SDK 33.
8.7: Bug fix.
8.6: Added min(), max(), and avg() functions which each take two values.
Custom Formulas version 9.4
Updated At: 2025-12-05
Changes: 9.4: Fixed issue with file association.
9.3: Updated to target Android SDK 35.
9.2: Fixed a bug with file association for .cf files.
9.1: Allow entry of formulas in Linear Solver without having to insert *'s between coefficient and variable name.
9.0: Updated calculator tool.
8.9: Updated to target Android SDK 34.
8.8: Updated to target Android SDK 33.
8.7: Bug fix.
8.6: Added min(), max(), and avg() functions which each take two values.
Custom Formulas version 9.3
Updated At: 2025-07-08
Changes: 9.3: Updated to target Android SDK 35.
9.2: Fixed a bug with file association for .cf files.
9.1: Allow entry of formulas in Linear Solver without having to insert *'s between coefficient and variable name.
9.0: Updated calculator tool.
8.9: Updated to target Android SDK 34.
8.8: Updated to target Android SDK 33.
8.7: Bug fix.
8.6: Added min(), max(), and avg() functions which each take two values.
Custom Formulas version 9.2
Updated At: 2025-06-17
Changes: 9.2: Fixed a bug with file association for .cf files.
9.1: Allow entry of formulas in Linear Solver without having to insert *'s between coefficient and variable name.
9.0: Updated calculator tool.
8.9: Updated to target Android SDK 34.
8.8: Updated to target Android SDK 33.
8.7: Bug fix.
8.6: Added min(), max(), and avg() functions which each take two values.
Custom Formulas version 9.1
Updated At: 2024-09-06
Changes: 9.1: Allow entry of formulas in Linear Solver without having to insert *'s between coefficient and variable name.
9.0: Updated calculator tool.
8.9: Updated to target Android SDK 34.
8.8: Updated to target Android SDK 33.
8.7: Bug fix.
8.6: Added min(), max(), and avg() functions which each take two values.
8.5: Added an option under the "Copy database" button on the "About" dialog to restore the internal database from a copy in the app folder.
Custom Formulas version 9.0
Updated At: 2024-07-11
Changes: 9.0: Updated calculator tool.
8.9: Updated to target Android SDK 34.
8.8: Updated to target Android SDK 33.
8.7: Bug fix.
8.6: Added min(), max(), and avg() functions which each take two values.
8.5: Added an option under the "Copy database" button on the "About" dialog to restore the internal database from a copy in the app folder.
8.4: Added button on "About" dialog to copy internal database to app data area for backup purposes.
Custom Formulas version 8.7
Updated At: 2023-08-02
Changes: 8.7: Bug fix.
8.6: Added min(), max(), and avg() functions which each take two values.
8.5: Added an option under the "Copy database" button on the "About" dialog to restore the internal database from a copy in the app folder.
8.4: Added button on "About" dialog to copy internal database to app data area for backup purposes.
8.3: Added options to show tenths of seconds and hundreds of seconds for output variables. Bug fix.
8.2: Updated to target Android SDK 31
Custom Formulas version 8.8
Updated At: 2023-08-02
Changes: 8.8: Updated to target Android SDK 33.
8.7: Bug fix.
8.6: Added min(), max(), and avg() functions which each take two values.
8.5: Added an option under the "Copy database" button on the "About" dialog to restore the internal database from a copy in the app folder.
8.4: Added button on "About" dialog to copy internal database to app data area for backup purposes.
8.3: Added options to show tenths of seconds and hundreds of seconds for output variables. Bug fix.
Custom Formulas version 8.0
Updated At: 2022-04-01
Changes: 8.0: Added a linear equation solving tool on the main page menu.
7.9: Default to focusing on first input variable on compute page, and added preference to control this.
7.8: Added a sigma button on compute page which allows a range of values to be used for one input variable, with the output values being summed.
7.7: Bug fix.
7.5: Bug fixes.
7.4: Show location of data files on "About" dialog.
Disclaimer
Official Google Play Link
We do not host Custom Formulas on our servers. We did not scan it for viruses, adware, spyware or other type of malware. This app is hosted by Google and passed their terms and conditions to be listed there. We recommend caution when installing it.
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