Percent increase or decrease between an old and new value, with absolute difference.. Percentage Change Calculator is a free online tool from the ToolsRift Math Calculators collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.
Enter the original value and the new value and the calculator returns the percentage change and the absolute difference.
Percentage change = (new − old) / |old| × 100%, positive for an increase and negative for a decrease.
An increase gives a positive result; a decrease gives a negative one — the sign shows the direction of change.
Simply new minus old, the raw amount of change before it is expressed as a percentage.