Percentage of a number
Find a percentage of a given number.
25% of 200 = 50
Free Percentage Tool
Percentage Calculator
Calculate percentages, percentage increases and decreases, percentage changes, and what percentage one number is of another.
Percentage calculator
Example: What is 25% of 200? The answer is 50.
Quick percentage examples
What is a percentage?
A percentage expresses a number as a fraction of 100. The word percent means "per hundred," so 25% means 25 parts out of 100.
Percentages are used in many everyday situations, including shopping discounts, price changes, test scores, budgets, business reports, statistics, and financial calculations.
This calculator provides several common percentage calculations so you can choose the method that matches the problem you are solving.
Types of percentage calculations
Percentage increase
Add a percentage to an original value.
200 + 10% = 220
Percentage decrease
Subtract a percentage from an original value.
200 − 10% = 180
Percentage change
Compare an original value with a new value.
100 → 125 = 25% increase
What percentage?
Find the percentage that one value represents of a total.
25 ÷ 200 × 100 = 12.5%
Percentage formulas
Percentage of a number
Percentage ÷ 100 × Number
Example: 25 ÷ 100 × 200 = 50
Percentage increase
Original + (Original × Percentage ÷ 100)
Example: 200 + (200 × 10 ÷ 100) = 220
Percentage decrease
Original − (Original × Percentage ÷ 100)
Example: 200 − (200 × 10 ÷ 100) = 180
Percentage change
(New − Original) ÷ Original × 100
Example: (125 − 100) ÷ 100 × 100 = 25%
What percentage?
Value ÷ Total × 100
Example: 25 ÷ 200 × 100 = 12.5%
Common uses for percentage calculations
Shopping discounts
Calculate how much a discount reduces the original price and estimate the final amount.
Price increases
Calculate the new price after a percentage increase.
Test scores
Convert marks into percentages to understand performance.
Business calculations
Compare changes in sales, costs, revenue, quantities, or other business figures.
Budgets
Calculate what portion of a budget is represented by a particular expense.
Statistics
Express a value as a percentage of a total when analyzing groups or categories.
How to use this percentage calculator
- 1. Choose the type of percentage calculation you need.
- 2. Enter the numbers requested by that calculation.
- 3. Select Calculate.
- 4. Review the result and the calculation explanation.
- 5. Select Reset to start a new calculation.
Percentage calculation tips
- • A percentage is always based on a reference or total value.
- • A percentage increase and percentage decrease are calculated relative to the original value.
- • Percentage change can be positive or negative depending on whether the value increased or decreased.
- • When finding what percentage one value represents of another, the total cannot be zero.
- • For financial or business decisions, verify important results against the underlying source data.
Browser-based percentage calculations
The calculations on this page are performed directly in your web browser. No account is required, and the numbers entered into the calculator do not need to be uploaded to a server for the calculation itself.
Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 25% of 200 is 50.
How do I calculate a percentage increase?
Multiply the original value by the percentage divided by 100, then add the result to the original value. For example, increasing 200 by 10% gives 220.
How do I calculate a percentage decrease?
Multiply the original value by the percentage divided by 100, then subtract the result from the original value. For example, decreasing 200 by 10% gives 180.
How do I calculate percentage change?
Subtract the original value from the new value, divide by the original value, and multiply by 100.
What percentage is one number of another?
Divide the value by the total and multiply by 100. For example, 25 is 12.5% of 200.
Is this percentage calculator free?
Yes. The ToolNoveHub percentage calculator is available for free in a web browser.
Can I use this calculator on a phone?
Yes. The calculator is designed to work across desktop, tablet, and mobile browsers.