# Percentage Calculator

> Work out percentages, percentage change and reverse percentages with the working shown.

To calculate a percentage, choose the type of question and enter your two numbers. The tool covers percentage of a value, percentage change, increases and decreases, and reverse percentages, and shows the working so you can check the arithmetic.

**URL:** https://convertto.tech/t/percentage-calculator
**Category:** Calculators (https://convertto.tech/c/calculators)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Choose the calculate.
2. Set the first value (x).
3. Set the second value (y).
4. The result appears immediately — copy or download it.

## FAQ

### Why is a 50% rise then a 50% fall not back to the start?

Percentages apply to different bases. 100 raised by 50% is 150; 150 reduced by 50% is 75, not 100. The second percentage is taken from the larger number.

## Related tools

- [Fraction Calculator](https://convertto.tech/t/fraction-calculator): Add, subtract, multiply and divide fractions, with the result simplified.
- [Break-Even Point Calculator](https://convertto.tech/t/break-even-calculator): Find how many units you must sell to cover your costs.
- [Compound Interest Calculator](https://convertto.tech/t/compound-interest-calculator): Project savings growth with compound interest and regular contributions.
- [Currency Converter](https://convertto.tech/t/currency-converter): Convert between 30+ currencies using official European Central Bank reference rates.
- [Discount Calculator](https://convertto.tech/t/discount-calculator): Work out sale prices, stacked discounts and how much you actually save.
- [Exponent, Root & Logarithm Calculator](https://convertto.tech/t/exponent-logarithm-calculator): Calculate powers, nth roots, logarithms in any base, and exponentials.
- [GCD & LCM Calculator](https://convertto.tech/t/gcd-lcm-calculator): Find the greatest common divisor and lowest common multiple of any set of numbers.
- [Inflation Calculator](https://convertto.tech/t/inflation-calculator): See what an amount of money is worth after inflation over any period.