Math · Three ways

Percentage calculator

Find a percentage of a number, what percent one number is of another, or the percent change between two values.

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Rough sheet

step-by-step
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The three percentage calculations covered

"Percent of a value" multiplies your number by the percentage as a decimal (e.g., 20% of 50 = 0.20 × 50). "What percent is X of Y" divides X by Y and converts to a percentage. "Percent change" subtracts the old value from the new value, divides by the old value, and converts to a percentage — a negative result means a decrease. These three cover the vast majority of everyday percentage questions, from calculating a discount to figuring out how much a value has grown.

Frequently asked questions

Percentage change is (new value − old value) ÷ old value × 100. Switch to the "Change" mode above and enter your two values — it’s calculated live.

"X% of Y" finds a portion of a number, "X is what % of Y" finds a ratio between two numbers, and "Change" finds the percent increase or decrease between two values.