Free online percentage calculator. Calculate what X% of a number is, find what percent one number is of another, and calculate percent increase or decrease between two values — all in one tool.
What is X% of Y?
X is what % of Y?
% Change A to B
What is X% of Y?
X is what % of Y?
Percent change from A to B
How to Use the Percentage Calculator
- Choose the type of percentage calculation: "What is X% of Y?", "X is what % of Y?", or "% Change A to B"
- Enter the numbers in the input fields
- Click "Calculate" to see the result along with the formula used
Types of Percentage Calculations
- What is X% of Y? — Find a percentage of a number. Example: What is 20% of 150? Answer: 30.
- X is what % of Y? — Find what percentage one number is of another. Example: 30 is what % of 150? Answer: 20%.
- % Change A to B — Calculate the percent increase or decrease between two values. Example: From 100 to 125 is a 25% increase.
Percentage Formulas
- Percent of a number: (X × Y) ÷ 100
- X as a percent of Y: (X ÷ Y) × 100
- Percent change: ((New − Old) ÷ Old) × 100
Common Uses for a Percentage Calculator
- Shopping — Calculate discounts, sale prices, and savings
- Tipping — Compute tips on restaurant bills
- Tax calculations — Figure out sales tax, VAT, or GST amounts
- Grades and scores — Calculate exam percentages and grade weights
- Finance — Compute interest rates, returns, or profit margins
- Statistics — Analyze data and survey results
- Business — Track growth rates, market share, and KPIs
Why Use Our Percentage Calculator?
- 3 calculations in one — Covers every common percentage problem