Percentage Calculator
Calculate what percentage one number is of another, find a percentage of a value, measure percentage increase or decrease, and add or subtract a percentage from a base number. Every calculation runs in your browser.
Quick reference
This calculation type takes two plain numbers, so the shortcuts do not apply.
How to use
- Choose the kind of percentage calculation you need.
- Enter the two numbers the calculation requires.
- Read the result, which updates as soon as you calculate.
Percentage formulas
Choose the formula that matches your question. The base value is the number you compare against, and it cannot be zero when it is used as the denominator.
- A is what percent of B: (A / B) × 100
- What is P% of B: (P / 100) × B
- Percentage change from old to new: ((new − old) / old) × 100
- Add P% to a base value: base × (1 + P / 100)
- Subtract P% from a base value: base × (1 − P / 100)
Worked percentage examples
- 15 is 7.5% of 200.
- 15% of 200 is 30.
- The change from 80 to 100 is a 25% increase.
- Adding 10% to 120 gives 132.
- Subtracting 15% from 120 gives 102.
Related calculators
- Discount Calculator
Calculate a sale price and the amount saved from one discount rate.
- Unit Converter
Convert measurements when the values you are comparing use different units.
- Bill Split Calculator
Split a shared bill among people after the percentage calculation is complete.
Frequently asked questions
- How do I calculate percentage increase or decrease?
- Choose the percentage-change mode, enter the original value first and the new value second. A positive result is an increase; a negative result is a decrease.
- Is my data sent anywhere?
- No. The calculation happens entirely in your browser.
Privacy
Numbers are calculated in your browser and are never sent to a server.
Related tools
- Discount Calculator
Enter an original price and a discount rate to see the amount saved and the final price, with optional tax. Runs entirely in your browser.
- Unit Converter
Enter a value and its unit to convert instantly to another unit across length, weight, temperature, and more. Converted in your browser.
- Bill Split Calculator
Enter a bill total and the people splitting it to see each person's share, with support for tips and individual payment adjustments. Runs in your browser.