The Percent Change Calculator is a free app that lets you calculate the percent change for three scenarios. It's a quick way to do calculations without having to use any other calculator app.

To use the app, you just need to enter the two numbers, then select one of the three scenarios. Once you're finished, you can share it on social media.

To see where it was calculated from, you can open the settings tab. There you can see the source and the value. You can also add comments to help other users understand the calculations.