๐Percentage Change Calculator
Find percentage increase, decrease, or reverse a known percentage change to find the original value.
Free Percentage Change Calculator
Our free percentage change calculator finds the percentage increase or decrease between two numbers instantly. Enter an original value and a new value, and get the exact percentage change along with the absolute difference โ perfect for tracking price changes, salary raises, weight loss, or any before-and-after comparison.
Switch to reverse mode to solve the opposite problem: if you know a value increased or decreased by a certain percentage, this tool works backward to find the original starting value. This is useful for figuring out a pre-discount price or a pre-raise salary.
Every result shows the formula and substitution used, so you can follow the math rather than just trust a black-box answer. No sign-up, no downloads โ everything runs instantly in your browser.