How it works
Percentage Calculator — Calculate percentages, increases and decreases. All processing happens in your browser — no upload, no signup, no email required. Free forever.
Frequently asked questions
Which percentage formulas are available?
Three: 'X% of Y' (e.g. 20% of 150), 'X is what % of Y' (e.g. 30 is what % of 60), and '% change from X to Y' (positive for increase, negative for decrease).
How is percentage change calculated?
It's ((new − old) / old) × 100. So going from 100 to 120 is +20%, and from 100 to 80 is −20%.
Why does my result show NaN?
It usually means a divisor is zero (you can't compute X / 0). Adjust the second input to a non-zero number.
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