Everyday Free Tools

Percentage Calculator

Calculate percentages instantly in your browser. Use the tabs below for percent of a number, reverse percentage, increase/decrease, or discount price.

Result: —

How it works

  • X% of Y = (X ÷ 100) × Y
  • X is what % of Y = (X ÷ Y) × 100
  • Percentage change = ((new − old) ÷ old) × 100
  • Discount price = original × (1 − discount% ÷ 100)

Examples

  1. 15% of 200 = 30
  2. 30 is what percent of 150? → 20%
  3. From 80 to 100 is a 25% increase
  4. $49.99 with 20% off → $39.99 (you save $10.00)
  5. 42 out of 50 correct → 84%

FAQ

How do I calculate a percentage of a number?

Multiply the number by the percentage divided by 100. Example: 15% of 200 = 0.15 × 200 = 30.

How do I find percentage increase?

Subtract the old value from the new value, divide by the old value, then multiply by 100. From 80 to 100 is a 25% increase.

How do I calculate a discount price?

Sale price = original × (1 − discount% ÷ 100). A $49.99 item at 20% off costs $39.99.

Is my data stored?

No. All math runs locally in your browser. See our Privacy Policy.

When to use which mode

  • X% of Y — tips, tax estimates, “what is 15% of 200?”. Guide: percentage of a number.
  • X is what % of Y — scores and “what percent is 30 of 150?”.
  • Increase / Decrease — old vs new values. Guide: percentage increase.
  • Discount — sale price from original and off-%.
  • Restaurant tip + split bill → prefer the Tip Calculator.

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