Free Percentage Calculator
Perform instant percentage calculations. Find a percentage of a number, calculate percentage change, or determine what percent one number is of another.
Last Updated: 15 Jan 2026
What is X% of Y?
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What are Percentages?
In mathematics, a percentage is a number or ratio expressed as a fraction of 100. It's denoted using the percent sign "%" and represents how large or small one quantity is relative to another. Percentages are used extensively in everyday life, from calculating discounts and taxes to analyzing data and financial planning.
Understanding percentages is essential for personal finance, business calculations, academic work, and data analysis. Whether you're calculating a tip, determining a discount, analyzing growth rates, or comparing values, percentages provide a standardized way to express proportions and changes.
Why Use Our Free Percentage Calculator?
Multiple Calculation Types
Calculate percentage of a number, find what percent one number is of another, or calculate percentage increase/decrease—all in one tool.
Instant Results
Get percentage calculations instantly with clear explanations. No manual math required—enter values and see results immediately.
Accurate Calculations
Eliminate calculation errors with our precise percentage calculator. Perfect for financial planning, shopping, and academic work.
Common Use Cases for Percentage Calculator
Personal Finance
Discount Calculations
Calculate sale prices, discounts, and savings. Find out how much you save with 20% off, 30% off, or any discount percentage.
Tip Calculations
Calculate tip amounts for restaurants, delivery services, or services. Find 15%, 18%, 20%, or custom tip percentages instantly.
Tax Calculations
Calculate sales tax, income tax percentages, or tax deductions. Determine how much tax applies to purchases or income.
Business & Analysis
Growth Rates
Calculate percentage increase or decrease in sales, revenue, profits, or any business metric. Analyze growth trends and performance.
Market Share
Determine what percentage of the market a company or product holds. Calculate market share and competitive positioning.
Data Analysis
Calculate percentages in surveys, polls, research data, or statistics. Find proportions, distributions, and relative frequencies.
Common Percentage Formulas
Percentage of a Number
Result = (Percentage / 100) × NumberExample: What is 25% of 200?
25% of 200 = (25 / 100) × 200 = 0.25 × 200 = 50
One Number is What % of Another
Result = (Part / Total) × 100Example: 50 is what percent of 200?
(50 / 200) × 100 = 0.25 × 100 = 25%
Percentage Change (Increase/Decrease)
Result = ((New Value - Old Value) / Old Value) × 100Example: What is the percentage increase from 50 to 75?
((75 - 50) / 50) × 100 = (25 / 50) × 100 = 0.5 × 100 = 50% increase
Frequently Asked Questions
How do I calculate a percentage of a number?
Multiply the number by the percentage as a decimal. For example, to find 20% of 50, multiply 50 by 0.20 (or divide 20 by 100 first) to get 10.
How do I find what percent one number is of another?
Divide the part by the total, then multiply by 100. For example, to find what percent 25 is of 100: (25 / 100) × 100 = 25%.
How do I calculate percentage increase or decrease?
Subtract the old value from the new value, divide by the old value, then multiply by 100. A positive result indicates an increase; negative indicates a decrease.
What's the difference between percentage points and percentages?
Percentage points measure absolute change (e.g., from 10% to 15% is a 5 percentage point increase). Percentages measure relative change (50% increase from 10% to 15%).
Is this tool free?
Yes, this percentage calculator is 100% free to use with no limits or sign-ups required.
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