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Percentage Calculator
Three instant percentage calculations in one tool. Find X% of a number, compare two numbers as a percentage, or find the original from a percentage. No sign-up needed.
Type of calculation
50
25% of 200 = 50
How percentage works
A percentage is a fraction of 100. "25%" means "25 out of every 100" or mathematically 0.25. All four modes above are algebraically equivalent — we just rearrange which variable you want to solve for.
Frequently asked questions
Can I use this for percentage increase or decrease?
Yes — the fourth mode (% change from X to Y) handles this directly. A positive number is an increase, negative is a decrease.
Why does the third mode divide by zero?
If you enter 0 as the percentage, the original number is undefined (any number is 0% of itself). We show 0 in that case as a safe fallback.
Last updated
For general calculations only. Not financial, tax, or legal advice — see our disclaimer.