Math Calculators
Percentage Calculator
Calculate percentages quickly β find what percent one number is of another, or compute a given percentage of any value.
Formula Used
(Value Γ Percentage) Γ· 100
About This Calculator
What It Does
This calculator finds what a given percentage of a number equals. Enter a value and a percentage and it instantly returns the result β for example, 'What is 15% of 200?' The calculator also handles the reverse: '25 is what percent of 80?' and '30 is 15% of what number?' It uses the standard percentage formula for all three common percentage problems.
Worked Example
Example 1 β Find a percentage of a number: What is 15% of 200? 200 Γ 15 Γ· 100 = 30. So 15% of 200 is 30. Example 2 β Find what percent one number is of another: 25 is what percent of 80? 25 Γ· 80 Γ 100 = 31.25%. So 25 is 31.25% of 80. Example 3 β Find the whole from a percentage: 30 is 15% of what number? 30 Γ· 15 Γ 100 = 200. So 30 is 15% of 200.
Real-World Usage
Calculate discounts during sales (30% off a $50 item saves $15). Determine tip amounts (15% on a $60 bill = $9). Compute tax, commission rates, or investment returns. Find what percentage of a budget has been spent (spent $450 of a $1,500 budget = 30%). Teachers use it to calculate final grades from weighted components.
Local Context
Percentages are a universal mathematical concept and work the same way regardless of currency or country. The formula is identical whether you use dollars, euros, yen, or any unit. Percentage calculations underpin everything from retail discounts to financial ratios worldwide.
Last reviewed: May 2026.
Frequently Asked Questions
How do you calculate a percentage?
Multiply the number by the percentage and divide by 100. For example, 20% of 200 is (200 Γ 20) Γ· 100 = 40.
What is a percentage?
A percentage is a number expressed as a fraction of 100. 50% means 50 out of 100, and 100% represents the whole.
How do I find what percent one number is of another?
Divide the part by the whole and multiply by 100. For example, 30 out of 150 is (30 Γ· 150) Γ 100 = 20%.