Percentage Calculator
Fast percent math: X% of Y, what percent is A of B, percent change, and increase/decrease.
1) What is X% of Y?
Formula: Y × (X / 100)
2) A is what percent of B?
Formula: (A / B) × 100
3) Percent change (from Old to New)
Formula: ((New − Old) / Old) × 100
4) Increase / decrease by X%
Formula: Base × (1 + X/100)
Tip
You can type decimals with a dot (.) or comma (,). Negative percentages work too.
🧮 Percent math
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📱 Mobile-friendly
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A single responsive unit is enough to start.
Common questions
“What is 15% of 240?” “How much did it increase from 120 to 150?” “25 is what percent of 200?” Use sections 1–4 above depending on the question.
15% of 240 → 36
120 → 150 → 25%
25 of 200 → 12.5%