What kinds of percentage calculations does this tool handle?

Three common ones: finding X% of Y, working out what percent X is of Y, and finding what number X is Y percent of.

Yes, it's a free browser-based calculator, no sign-up required.

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Percentage

Three common percentage calculations, each as its own tab.

X (percentage)

Y (number)

What is X% of Y? — e.g. what is 20% of 500?

Enter valid numbers in both fields.

Result

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Three percentage tools in one page

Pick the tab that matches the question you're actually asking.

X% of Y

Find a percentage of any number.

20% of 250 = 50
15% of 80 = 12
18% of 500 = 90
20% of 75 = 15
25% of 200 = 50
10% of 450 = 45
12.5% of 800 = 100
7% of 1,500 = 105

Useful for: discounts, tips, taxes, commissions, markups, fees, price adjustments, and everyday calculations.

X is what % of Y?

Find what percentage one number represents of another.

50 is what % of 200? = 25%
30 is what % of 120? = 25%
15,000 is what % of 60,000? = 25%
45 is what % of 180? = 25%
75 is what % of 300? = 25%
80 is what % of 500? = 16%
150 is what % of 600? = 25%
900 is what % of 1,200? = 75%

Useful for: comparing expenses, measuring progress, calculating margins, understanding budgets, analyzing performance, and comparing values.

X is Y% of what?

Work backward to find the original amount.

50 is 20% of what? = 250
30 is 15% of what? = 200
75 is 25% of what? = 300
120 is 40% of what? = 300
100 is 10% of what? = 1,000
90 is 30% of what? = 300
150 is 25% of what? = 600
80 is 20% of what? = 400

Useful for: finding original prices, working backward from discounts, calculating pre-tax amounts, determining sales targets, commissions, and reverse percentage calculations.

Everyday ways to use this calculator

Shopping

Calculate discounts, sale prices, markups, taxes, and price changes.
Example: an item costs 200 and is discounted by 25%. 25% of 200 = 50. Subtract that from 200 for a sale price of 150.

Restaurants

Quickly calculate tips and percentage-based charges.
Example: a restaurant bill is 75 and you want to leave a 20% tip. 20% of 75 = 15. Add that to 75 for a total of 90.

Business

Calculate commissions, margins, markups, fees, costs, revenue changes, and sales targets.
Example: a salesperson earns a 5% commission on 10,000 in sales. 5% of 10,000 = 500.

Personal finance

Work out savings rates, expense percentages, investment allocations, and budget shares.
Example: you earn 5,000 per month and save 20%. 20% of 5,000 = 1,000.

School and study

Solve percentage problems, check your answers, and work through percentage formulas quickly.
Example: a test has 80 questions and you answered 68 correctly. 68 is what % of 80? = 85%.

Work and data

Compare values, calculate percentage shares, and measure increases or decreases.
Example: a company's sales increased from 20,000 to 25,000. Increase = 5,000. Using X is what % of Y: 5,000 is what % of 20,000? = 25% increase.

Not sure which tab to use?

Want to find a percentage of a number? → X% of Y
Want to know what percentage one number is of another? → X is what % of Y
Know the percentage and the result, but need the original amount? → X is Y% of what

This calculator puts all three in one place, with a separate tab for each.

Disclaimer: Results are calculated directly from the numbers you enter. This calculator does not provide financial, investment, or tax advice. Please verify all calculations independently — we do not carry any liability for errors, and this calculator may make mistakes. This tool does not provide financial, investment, tax, or legal advice.