Percentage Calculator, developed by Philip Stephens, is a free Android app that provides an easy-to-use interface for calculating percentage changes. It offers the ability to calculate both forward and reverse percentages, making it a versatile tool for a variety of practical uses. One of its main features is the ability to calculate VAT (sales tax) from either the original price or the final selling price.

The calculator's colors are customizable, allowing users to personalize the app to their liking. It also has a user-definable decimal marker (point or comma) and an optional thousands separator that can be set to either a space or comma/point (depending on the decimal marker). With variable precision up to 20 decimal places, Percentage Calculator is a precise and reliable tool for anyone who needs to calculate percentages. An ad-free version of the app is also available.