What is X% of Y?
What is % of
X is what percent of Y?
is what % of
Percentage increase / decrease
From to
Work out percentages three ways — percent of a number, X as a percent of Y, and percentage increase or decrease.
Runs in your browser — nothing uploaded
Covers common percent questions
Results in one click
No registration required
Use the first calculator: enter the percentage and the number, for example 20% of 150, and click Calculate to get the result instantly. Completely free.
Use the second calculator: enter both numbers, for example 30 is what percent of 120, and it returns the percentage.
Use the third calculator: enter the original and new values, and it shows the percentage change, positive for an increase and negative for a decrease.
No. All calculations happen entirely in your browser. Nothing is uploaded — guaranteed privacy.
Yes. You can enter decimal numbers and percentages, and results are rounded to a sensible number of decimal places.
Percent of a number is (percent ÷ 100) × number. X as a percent of Y is (X ÷ Y) × 100. Percentage change is ((new − old) ÷ old) × 100.