Percentage Calculator
Find percentages, percentage change, and what-percent-of-what in seconds.
How this percentage calculator works
The percentage calculator takes the numbers you enter and applies a standard formula for this kind of calculation, showing the result instantly with no page reload. Find percentages, percentage change, and what-percent-of-what in seconds.
Everything runs client-side in JavaScript, so your inputs never leave your device — there's no server, no account and no tracking involved in getting your answer.
Frequently asked questions
Multiply the number by the percentage, then divide by 100. For example, 20% of 150 is (20 × 150) ÷ 100 = 30 — exactly what the calculator above does when you choose “X% of Y”.
Subtract the original value from the new value, divide by the original value, then multiply by 100. A positive result is an increase; a negative result is a decrease.