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Percentage Calculator
The three percentage questions, answered instantly: what is X% of Y, what percent is X of Y, and the percent change between two numbers. No sign-up, free.
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Runs 100% in your browser Instant results as you type Free, no sign-up
How to calculate percentages
Pick the question
Three modes cover discounts, shares and changes - each phrased in plain words.
Enter the two numbers
The result updates live as you type.
Read the answer
A single clear figure - the discount amount, the share, or the increase/decrease in percent.
Percentage questions, answered
Is my data sent to a server?
No. It is instant arithmetic in your browser - prices, salaries and margins never leave your machine.
How do I calculate a discount?
Use 'What is X% of Y': 15% of 80 is 12 - the money you save; pay 68.
What is percentage change?
The difference relative to the STARTING value: going from 50 to 65 is +30%, but going back from 65 to 50 is −23.1% - the asymmetry trips everyone up.
Why can a percentage be over 100?
150% of 40 is simply 60 - percentages are just hundredths and scale past the whole without issue.