Percentage Calculator

Three calculators in one, covering the percentage questions people search for most:

1. What is X% of a number?

Enter the percentage and the value. For example, 15% of 200 = 30. Handy for tips, discounts, tax, and commissions.

2. X is what percent of Y?

Enter the two numbers to get the ratio as a percentage. For example, 25 is 12.5% of 200. Useful for scores, progress, and shares of a total.

3. Percent change (increase / decrease)

Enter a starting value and an ending value to get the percent change, shown with a + for an increase and − for a decrease. For example, 100 → 150 is +50%, and 100 → 50 is −50%. Perfect for price changes, growth rates, and before/after comparisons.

Tips

• Percent change uses the original value as the base, so going up 50% then down 50% does not return you to the start.
• All three run entirely in your browser — nothing is uploaded, and it works offline.