Percentage Calculator
Calculate percentages, percentage increase, and percentage decrease instantly.
The Percentage Calculator handles the everyday percentage math most people forget how to do by hand. It's free and requires no sign-up, so students, shoppers, and professionals can get an instant answer. Use it to find a percentage of a number, work out a percentage increase or decrease, or figure out what percentage one value is of another.
What is Percentage Calculator?
A percentage expresses a number as a fraction of 100, and this tool automates the three most common percentage problems people run into. For percentage change, the calculation is ((new value − old value) ÷ old value) × 100, which tells you whether a number has grown or shrunk and by how much. It's built to give a precise decimal answer instantly rather than requiring manual long division.
How to use Percentage Calculator
- Choose the type of percentage calculation you need.
- Enter the relevant numbers into the input fields.
- Get your instant, accurate percentage result.
Key features
- Calculates percentage of a number, percentage increase, and percentage decrease
- Finds what percentage one value represents of another
- Instant results with no manual formula needed
- Completely free with no sign-up or usage limits
Related tools
Work out savings with the Discount Calculator, check pricing using the Margin Calculator, or compare data with the Average Calculator.
Frequently asked questions
Is Percentage Calculator free?
Yes, the Percentage Calculator is free to use with no sign-up needed. You can run unlimited calculations at no cost.
Can it calculate percentage increase and decrease?
Yes, entering an old value and a new value shows both the percentage change and whether it's an increase or a decrease. This is useful for tracking things like price changes, salary raises, or performance metrics over time.
How do I find what percentage one number is of another?
Enter the part and the whole into the relevant fields, and the calculator divides the part by the whole and multiplies by 100 to give you the percentage. This is the same math used for calculating test scores, discounts, or completion rates.
Does the calculator round the result?
The calculator displays a precise decimal result rather than rounding aggressively, so you see the full accuracy of the calculation. You can round the displayed figure yourself depending on how much precision your use case needs.
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