Percentage Increase Calculator
Calculate the percentage increase between two numbers or apply a percent rise to a value with this free maths calculator in your browser.
Enter Values
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How to use this calculator
- Enter the value and the increase.
- Press Calculate.
How it works
Adds a percentage to a value: result = value × (1 + percent ÷ 100).
Worked example
200 + 15%. = 230.
Common mistakes
- Adding the percentage to the wrong base — an increase applies to the original amount.
- Confusing a percentage-point change with a percentage change.
Frequently asked questions
How do I calculate a percentage increase?
Increase = (new − old) ÷ old × 100. To add x% to a number, multiply it by (1 + x ÷ 100).
How do I reverse a percentage increase?
Divide the new amount by (1 + x ÷ 100), not by (1 − x ÷ 100); a reverse-percentage tool gives the original value.
How do I work backwards from the final amount?
To find the original value before an increase, use the reverse percentage calculator.
Related tools
- Percentage Decrease Calculator
- Percentage Change Calculator
- Reverse Percentage Calculator
- Percent Error Calculator
- Percentage Difference Calculator
- Fraction to Percent Calculator
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Cite this tool
Zerdly. (2026). Percentage Increase Calculator. Retrieved from https://www.zerdly.com/tools/percentage-increase-calculator/
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.