Percentage Calculator
Calculate percentages quickly — find X% of a number, what percent one number is of another, or the percentage change between values
What is X% of Y?
Free Percentage Calculator Online
Our free percentage calculator helps you solve the three most common percentage problems instantly: finding a percentage of a number, determining what percent one number is of another, and calculating the percentage change between two values. Whether you are analyzing marketing metrics, calculating discounts, tracking growth rates, or working with financial data, this tool gives you accurate results in seconds.
Common Uses for Percentages
- Marketing analytics - Calculate conversion rates, click-through rates, bounce rates, and churn rates to measure campaign performance.
- Business growth - Track revenue growth, user acquisition rates, and month-over-month percentage changes for data-driven decisions.
- Pricing & discounts - Calculate sale prices, markups, margins, and the impact of promotional discounts on revenue.
Percentage Tips
- Percentage trick - X% of Y always equals Y% of X. So 8% of 50 is the same as 50% of 8 (both are 4). Use whichever is easier to calculate.
- Percentage points vs. percent - Going from 5% to 10% is a 5 percentage point increase, but a 100% increase in relative terms. Be precise in your communication.
- Compound growth - Repeated percentage increases compound. A 10% increase followed by another 10% increase results in 21% total growth, not 20%.
Frequently Asked Questions
How do I calculate a percentage of a number?
To find X% of Y, multiply Y by X and divide by 100. For example, 25% of 200 is (200 × 25) ÷ 100 = 50. You can use our calculator above to compute this instantly.
How do I find what percentage one number is of another?
To find what percentage X is of Y, divide X by Y and multiply by 100. For example, 30 is what percent of 150? (30 ÷ 150) × 100 = 20%. This tells you 30 is 20% of 150.
How do I calculate percentage change?
Percentage change is calculated with the formula: ((New Value - Old Value) ÷ Old Value) × 100. A positive result means an increase, while a negative result means a decrease. For example, going from 80 to 100 is a 25% increase.
What is the difference between percentage and percentile?
A percentage is a fraction expressed out of 100 (e.g., 85% on a test means 85 out of 100). A percentile indicates a value below which a given percentage of data falls (e.g., the 90th percentile means you scored better than 90% of test-takers).
How do I calculate a percentage increase?
To calculate percentage increase: ((New Value - Original Value) ÷ Original Value) × 100. For example, if sales went from $10,000 to $15,000, the percentage increase is ((15000 - 10000) ÷ 10000) × 100 = 50% increase.
How do I calculate a percentage decrease?
To calculate percentage decrease: ((Original Value - New Value) ÷ Original Value) × 100. For example, if traffic dropped from 5,000 to 3,500 visitors, the decrease is ((5000 - 3500) ÷ 5000) × 100 = 30% decrease.
How are percentages used in marketing analytics?
Percentages are fundamental to marketing analytics. Click-through rate (CTR), conversion rate, bounce rate, churn rate, revenue growth rate, and market share are all expressed as percentages. Understanding percentage calculations helps you interpret KPIs and make data-driven decisions.
How do I convert a fraction to a percentage?
To convert a fraction to a percentage, divide the numerator by the denominator and multiply by 100. For example, 3/4 = (3 ÷ 4) × 100 = 75%. To convert a decimal to a percentage, multiply by 100 (e.g., 0.85 = 85%).
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