Money & Finance · Free tool

Percentage Calculator

Calculate percent of a number, percent change, and add/subtract a percent. Fast, clean, and mobile-friendly.

Updated April 2026

What is X% of Y?

X (percent)Y (value)

Result: —

X is what % of Y?

X (part)Y (whole)

Result: —%

Percent change from X to Y

X (start)Y (end)

Result: —

What it does

A fast percentage calculator that covers the three formulas that actually come up in daily life: “what is X% of Y”, “A is what percent of B”, and “percent change from old to new”. All three are live on the page — fill the one you need. Negative results show red so a price drop or account loss reads at a glance.

For tip and bill-split math specifically, use the Tip Calculator. For a written walkthrough of five common formulas, including markup and reverse percent, see How to calculate percentages.

How to use it

Use the first card for “what is X% of Y” — enter two numbers.
Use the second for “A is what % of B”.
Use the third for percent change — negative means a drop.
Numbers update as you type; nothing to submit.