Percentage Calculator
Calculate percentages instantly — find what X% of a number is, what percent one number is of another, and percentage change between two values.
What is X% of Y?
X is what % of Y?
Percentage Change
How to use this tool
- Choose the type of percentage calculation you need from the three sections below.
- Enter your numbers into the input fields — results update instantly as you type.
- Read the explanation line under the result to see the formula and working.
- Click "Copy" to copy the result to your clipboard.
Why use our Percentage Calculator?
Percentage calculations come up constantly — from working out a discount at the checkout to calculating a tip at a restaurant, tracking a grade, or measuring business growth. This tool gives you three of the most common percentage formulas in one place, with live results and a clear explanation of the working so you understand the math, not just the answer.
Frequently Asked Questions
How do I calculate X% of a number?
Multiply the number by the percentage and divide by 100. For example, 15% of 200 = 200 × 15 ÷ 100 = 30. The first calculator on this page does this automatically.
How do I find what percent one number is of another?
Divide the part by the whole, then multiply by 100. For example, 30 is what percent of 200? = (30 ÷ 200) × 100 = 15%. The second calculator handles this.
What is the percentage change formula?
Percentage change = ((New Value − Old Value) ÷ Old Value) × 100. A positive result means an increase; a negative result means a decrease. For example, going from 80 to 100 is a +25% increase.
What is the difference between percentage and percentage points?
A percentage point is an absolute difference between two percentages. If an interest rate goes from 2% to 5%, it increased by 3 percentage points, but that is a 150% relative increase. Percentage change measures the relative change; percentage points measure the absolute difference.
How do I calculate a percentage decrease?
Use the percentage change calculator. Enter the original (higher) value as "From" and the new (lower) value as "To". The result will be negative, indicating a decrease. For example, from 100 to 80 gives −20%, meaning a 20% decrease.
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