Percentage Calculator
Calculate percentages quickly and easily
What is X% of Y?
X is what % of Y?
Percentage Change
Add Percentage
Subtract Percentage
Free Online Percentage Calculator
Calculate percentages quickly and accurately with our free online percentage calculator. Whether you need to find what percentage one number is of another, calculate discounts, determine percentage increases or decreases, or solve any other percentage problem, our tool makes it simple.
Percentages are everywhere in daily life. From calculating sales tax and tips to understanding investment returns and grade point averages, percentage calculations are essential. Our calculator provides five different calculation modes to cover all common percentage scenarios you might encounter.
All calculations are performed instantly in your browser. Simply enter your numbers and get accurate results immediately. No registration required, no data stored, and completely free to use.
Available Calculations
What is X% of Y?
Calculate a percentage of any number. Example: 25% of 200 = 50
X is what % of Y?
Find what percentage one number is of another. Example: 50 is 25% of 200
Percentage Change
Calculate the percentage increase or decrease between two values.
Add/Subtract Percentage
Add or subtract a percentage from a number. Perfect for taxes and discounts.
Common Uses for Percentage Calculations
Shopping & Discounts
Calculate sale prices, apply coupon codes, and figure out how much you save on discounted items.
Restaurant Tips
Quickly calculate 15%, 18%, 20% or any custom tip percentage for your restaurant bill.
Taxes
Calculate sales tax, VAT, income tax percentages, and tax deductions for financial planning.
Grades & Scores
Convert test scores to percentages, calculate GPA weights, and determine grade averages.
Finance & Investments
Calculate investment returns, interest rates, loan payments, and portfolio growth.
Business Analytics
Analyze growth rates, profit margins, market share changes, and sales performance.
Frequently Asked Questions
How do I calculate a percentage?
To find X% of Y, multiply Y by X and divide by 100. For example, 25% of 200 = 200 × 25 ÷ 100 = 50. Our calculator does this automatically.
How do I calculate percentage change?
Percentage change = ((New Value - Old Value) / Old Value) × 100. A positive result means increase, negative means decrease.
How do I add a percentage to a number?
To add X% to a number, multiply the number by (1 + X/100). For 100 + 15% = 100 × 1.15 = 115.
How do I calculate what percentage one number is of another?
Divide the first number by the second and multiply by 100. For example, 50 is what % of 200? = (50 ÷ 200) × 100 = 25%.
What is the difference between percentage and percent?
They mean the same thing. "Percent" comes from Latin "per centum" meaning "by the hundred." The symbol % represents both terms.
How accurate are these calculations?
Our calculator uses JavaScript floating-point arithmetic with results displayed to 2 decimal places. This is more than sufficient for everyday percentage calculations.