Percentage Calculator

Find a percent of a number, what percent one number is of another, or the percent change between two numbers.

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How this is calculated

X% of Y = X ÷ 100 × Y. X as a percent of Y = X ÷ Y × 100. Percent change = (Y − X) ÷ |X| × 100.

Assumptions

  • Standard percentage math; results are rounded for display.

Estimates for planning and education only. Not financial, tax or legal advice, and not an official government calculation. Calculations run in your browser; nothing you enter is stored or sent.

Three common percentage questions

  • What is X% of Y? Useful for discounts, tips and tax. Example: 15% of 240 is 36.
  • X is what percent of Y? Useful for budgets. Example: if rent is $1,400 of a $4,200 take-home pay, rent is 33.3% of income.
  • Percent change from X to Y. Useful for price changes. Example: a bill that rises from $80 to $92 went up 15%.

A common mistake

A 50% increase followed by a 50% decrease does not bring you back to where you started. $100 up 50% is $150; $150 down 50% is $75. The same logic explains why stacked store discounts are smaller than they look. Try the discount calculator to see it in action.

Frequently asked questions

What is the difference between percent and percentage points?

If an interest rate goes from 4% to 5%, it rose by 1 percentage point, which is a 25% increase in the rate itself. News reports sometimes mix the two up.

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