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About the Percentage Calculator
Three common percentage questions in one place: what is X% of Y, X is what percent of Y, and what is the percentage increase or decrease from one number to another.
How to use it
- Fill in the numbers in the box that matches your question.
- The answer updates as you type.
- Use the percent-change box for price rises, growth rates or discounts.
Frequently asked questions
How do I calculate percentage change?
Percentage change = (new value − old value) ÷ old value × 100. A positive result is an increase and a negative result a decrease.
Why is a 50% increase followed by a 50% decrease not back to the start?
The second percentage applies to a larger number. 100 → 150 (+50%) → 75 (−50%).
Related tools
Discount CalculatorFinal price after one or two discounts, and how much you save.Age CalculatorExact age in years, months and days, plus days to the next birthday.BMI CalculatorBody mass index in metric or imperial units, with the healthy weight range.
Results are estimates for general information. For financial, tax, medical or legal decisions, check with a qualified professional.