Find percent of a number, what percent one number is of another, or percent change. Fully client-side — no account, uploads, or remote storage.
Added Apr 18, 2026
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Enter a value for what do you want to calculate? to see your result.
Calculates percentages in three modes: finding X% of a value, finding what percentage one number is of another, and calculating the percentage change between two values.
20% of 250 = 250 × 20/100 = 50.
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50 ÷ 200 × 100 = 25%.
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(250 − 200) ÷ 200 × 100 = +25%.
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Multiply 250 by 0.20 (which is 20/100). 250 × 0.20 = 50.
Divide (new value − old value) by the old value, then multiply by 100. A positive result is an increase; negative is a decrease.