Percentage Calculators
Choose a free percentage calculator for the exact problem you need to solve. Every tool includes a clear formula, realistic example, and calculation breakdown.
Part of Math.
Calculators
- Percentage CalculatorSolve five common percentage problems, including percentage of a number, percent of a total, reverse percentage, and percent greater or less.
- Percentage Change CalculatorCalculate directional percentage change between an old value and a new value.
- Percentage Decrease CalculatorCalculate the absolute decrease and percentage decrease from an original value to a lower value.
- Percentage Difference CalculatorCalculate the symmetric percentage difference between two nonnegative values.
- Percentage Increase CalculatorCalculate the absolute increase and percentage increase from an original value to a higher value.
- Reverse Percentage CalculatorFind the original value before a discount, reduction, markup, tax, or percentage increase was applied.
- What Percentage Is X of Y CalculatorFind what percentage one value represents of another value.
Guides
- How Percentages Work: Complete Guide with Examples
- How to Calculate Percentages Without a Calculator: Mental Math Methods
- Percentage Difference vs. Percentage Change: What's the Difference?
- Reverse Percentage Explained: Find the Original Value Before a % Change
- What Is Percentage Increase? Formula, Examples, and Common Uses
Frequently Asked Questions
- What is a percentage?
- A percentage is a ratio expressed per 100. For example, 25% means 25 out of 100, or 0.25 as a decimal.
- Which percentage calculator should I use?
- Use Percentage Change for a before-and-after comparison, Percentage Difference for two peer values, and Reverse Percentage to find an original value before an adjustment.
- How do I calculate a percentage of a number?
- Convert the percentage to a decimal and multiply by the number. For example, 20% of 150 is 0.20 × 150 = 30.
- Why are percentage increase and decrease not exact opposites?
- They use different reference values. Increasing 80 by 25% gives 100, but decreasing 100 by 25% gives 75.
- Are these percentage calculators free?
- Yes. They are free to use and require no account.
Last updated 7/17/2026