Free Percentage Calculator Online
Quickly find percentages, percentage decreases, and incremental differences.
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How to Calculate a Percentage Online
Our percentage calculator supports multiple calculation modes. To find what percentage one number is of another (e.g. what % is 25 of 200), enter both numbers and the tool calculates instantly. To find a percentage of a number (e.g. 15% of 340), enter the percentage and the number. To calculate percentage increase or decrease between two values, enter the original and new values and the percentage change is shown immediately. All calculations update in real time as you type.
Common Percentage Calculations Explained
Percentage of a number: Multiply the number by the percentage and divide by 100. Example: 20% of 500 = (500 × 20) / 100 = 100. Percentage increase: ((New Value - Old Value) / Old Value) × 100. Example: price went from 200 to 250 = 25% increase. Percentage decrease: ((Old Value - New Value) / Old Value) × 100. Example: price went from 500 to 400 = 20% decrease. These formulas are built into our calculator so you never have to do the math manually.
Real-World Uses for a Percentage Calculator
A percentage calculator is one of the most universally useful math tools. Students use it for calculating exam scores and grades. Shoppers use it to calculate discount savings during sales events. Business owners use it to calculate profit margins, tax amounts, and revenue growth. Marketers use it to measure campaign performance changes. Investors use it to track portfolio gains or losses. Teachers use it to calculate grading curves and class averages.
Frequently Asked Questions
Can this calculate VAT or sales tax?
Yes. Enter the original price and the tax percentage (e.g. 15%) to find the tax amount and final price.
What if I get a negative percentage?
A negative result means a decrease. For example, -10% means the value went down by 10%.
Is this calculator accurate for large numbers?
Yes. The calculator handles any number size with full decimal precision.