Percentage Calculator
Three quick ways to calculate percentages: find a percentage of a number, find what percent one number is of another, or calculate a percentage change.
Result:—
Formula: Result = (Percent ÷ 100) × Number
Frequently Asked Questions
Divide X by Y and multiply by 100. For example, to find what percent 30 is of 150: (30 ÷ 150) × 100 = 20%. Use the second mode on this calculator to do this automatically.
Multiply the number by the percentage divided by 100. For example, 20% of 150 = (20 ÷ 100) × 150 = 30. The first mode on this calculator does this for you instantly.
Subtract the original value from the new value, divide by the absolute value of the original, then multiply by 100. For example: from 80 to 100 → ((100 − 80) ÷ 80) × 100 = 25% increase. A negative result means a decrease.
A percentage point is an absolute difference between two percentages. If interest rates go from 2% to 5%, that is a 3 percentage point increase, but a 150% relative increase. This distinction matters when comparing rates, polls, or statistics.
Yes. The calculator works with any positive or negative decimal numbers. Results are shown with up to 4 decimal places for precision. All calculations run entirely in your browser — no data is sent to a server.