Name: AppBuilder Classic (C)
Author: flowstate

AppBuilder Classic is in maintenance mode. New users should download AppBuilder 5:
https://apps.garmin.com/en-US/apps/fd690281-9c22-4fee-a81e-3b7f39aa67c5
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Build your own datafield! No coding required. App Builder lets you create a flexible, calculated data field using a simple math formula. If you want to get fancy, there's functions like IF and TIMEG. Your data can be recorded to the FIT activity file.

Full documentation and examples: https://ciq-appbuilder.blogspot.com/
Discussion thread: https://forums.garmin.com/developer/connect-iq/f/showcase/5428/data-field-appbuilder

AppBuilder Classic is one of 4 clone apps, so you can store up to 4 formulas.
All of my apps, including AppBuilder clones:
https://apps.garmin.com/en-US/developer/8545c609-c030-4c0c-b3d8-4bc63ebdc901/apps