How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. For example, 25% of 200 = (25 × 200) / 100 = 50. Use the first calculator section above.

How do I find what percentage one number is of another?

Divide the part by the whole and multiply by 100. For example, 30 is what percent of 150? Answer: (30 / 150) × 100 = 20%. Use the second calculator section.

How do I calculate percentage increase or decrease?

Use the formula: ((New - Old) / Old) × 100. For example, if a price goes from $80 to $100, the increase is ((100 - 80) / 80) × 100 = 25%. Use the third calculator section.

What is the difference between percentage and percentile?

A percentage is a ratio expressed as a fraction of 100 (e.g., 75%). A percentile indicates the value below which a given percentage of observations fall (e.g., scoring in the 90th percentile means you scored better than 90% of people).

Can I use this online percent calculator for tax or discount math?

Yes, for basic tax rate, discount, markup, and growth calculations. For example, to find the tax on a $500 purchase at 8% tax, enter 8 and 500 in the first calculator to get $40. For complex tax scenarios, consult a tax professional.

Calculators

Percentage Calculator

Use this free percentage calculator to handle the most common percentage tasks in one place: calculate a percent of a number, find what percent one value is of another, and measure percentage increase or decrease.

What is X% of Y?

100.00

X is what percent of Y?

25.00%

Percentage change

25.00%

Usage notes

Use the first calculator for discounts: '20% of 150' gives you the discount amount.
Percentage change is great for tracking prices, weight loss, grade improvements, and revenue growth.
Results are for informational purposes only — not professional financial advice.

Discount Calculator Guide: Calculate Percentage Change Compare: Percentage vs Discount Calculator All Calculators

How to Use This Tool

1Choose one of the three percentage calculators: X% of Y, X is what % of Y, or Percentage Change.
2Enter the required values in the input fields.
3The result appears instantly below each calculator section.

Frequently Asked Questions

How do I calculate a percentage of a number?: Multiply the number by the percentage and divide by 100. For example, 25% of 200 = (25 × 200) / 100 = 50. Use the first calculator section above.
How do I find what percentage one number is of another?: Divide the part by the whole and multiply by 100. For example, 30 is what percent of 150? Answer: (30 / 150) × 100 = 20%. Use the second calculator section.
How do I calculate percentage increase or decrease?: Use the formula: ((New - Old) / Old) × 100. For example, if a price goes from $80 to $100, the increase is ((100 - 80) / 80) × 100 = 25%. Use the third calculator section.
What is the difference between percentage and percentile?: A percentage is a ratio expressed as a fraction of 100 (e.g., 75%). A percentile indicates the value below which a given percentage of observations fall (e.g., scoring in the 90th percentile means you scored better than 90% of people).
Can I use this online percent calculator for tax or discount math?: Yes, for basic tax rate, discount, markup, and growth calculations. For example, to find the tax on a $500 purchase at 8% tax, enter 8 and 500 in the first calculator to get $40. For complex tax scenarios, consult a tax professional.