Percentage Calculator
Pick a mode, enter your numbers, and get the result with a tiny explanation. Everything runs in your browser.
Mode
Quick formulas
- x% of y → (x/100) × y
- x is what % of y → (x / y) × 100
- Increase y by x% → y × (1 + x/100)
- Decrease y by x% → y × (1 − x/100)
- Percent change from a to b → ((b − a)/a) × 100
- Discount x% on price p → p × (1 − x/100)
- Original price before discount → final ÷ (1 − x/100)