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Percentage Calculator
Three common questions in one place: what is X% of Y, what percentage is X of Y, and the percentage increase or decrease between two values. Everything runs in your browser – nothing is uploaded or saved.
Formulas
Percentage = part ÷ total × 100. Percentage change = (new − old) ÷ old × 100. Examples: 15% of 2000 = 300, 450 out of 600 = 75%, and 400 → 500 is a 25% increase.
🔒 Privacy: this tool runs entirely in your browser. Nothing you type is saved, uploaded or sent anywhere – close the tab and it is gone.
Frequently asked questions
How do I calculate a percentage increase?
(New − old) ÷ old × 100.
Can I work out exam marks as a percentage?
Yes. Enter your marks and the total in the second row.
Does it support decimals?
Yes.
Is anything saved?
No.