Five ways to calculate percentages: find a percent of a number, ratio, increase, decrease, or percent change. Results update as you type.
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Use this to find a portion of a number. For example: What is 20% of 150? Answer: 30. Great for discounts, tips, and commission.
Use this to find the percentage ratio. If you scored 45 out of 60 on a test: 45 is 75% of 60. Useful for grades and proportions.
Add a % to a number to calculate a price after markup or a value after growth. Adding 15% to £200 gives £230.
Subtract a % to find sale prices or reductions. Subtracting 25% from £80 gives £60.
Use the increase/decrease from X to Y mode to find growth rates. Going from 50 to 75 is a 50% increase. Useful for comparing metrics over time.
To calculate a restaurant tip: enter the bill amount, add the tip percentage. A 20% tip on £45 = £9, total £54.
This percentage calculator makes percent calculations fast and easy. Enter your values and results update instantly as you type.
What is 15% of 200?
Result: 30
45 is what percent of 180?
Result: 25%
Add 20% to £50
Result: £60
Subtract 10% from 250
Result: 225
Percentage change from 80 to 100
Result: 25% increase
What is 25% of 400?
Result: 100
What percent is 30 of 120?
Result: 25%
Add 15% to 80
Result: 92
The word 'percent' comes from the Latin 'per centum', meaning 'per hundred'. Percentage calculations have been used since ancient Rome, where the Senate set interest rate limits expressed as fractions of 100. The % symbol itself evolved from the Italian 'per cento', which was abbreviated over centuries into the sign used today.
A percentage is a way of expressing a number as a fraction of 100. For example, 25% means 25 out of every 100, or one quarter. Percentages make it easy to compare proportions regardless of the original quantities involved — a 20% discount on a £50 item and a 20% discount on a £200 item both mean you save a fifth of the price.
Divide the first number by the second, then multiply by 100. For example, 45 out of 60 is (45 ÷ 60) × 100 = 75%. This is useful for test scores, completion rates, market share calculations, and any situation where you want to express a part as a proportion of a whole.
To add a percentage: multiply the original number by the percentage, then add it on. For example, adding 15% to £200: 200 × 0.15 = 30, so £200 + £30 = £230. To subtract a percentage: 200 × 0.15 = 30, so £200 − £30 = £170. The 'Add % to Y' and 'Subtract % from Y' modes do this automatically.
These are often confused. A percentage point is an absolute difference between two percentages: if your savings rate rises from 3% to 5%, it went up by 2 percentage points. Percent change is a relative measure: going from 3% to 5% is a 66.7% increase in the rate. Percent change from X to Y = ((Y − X) / X) × 100.
If you know the result after a percentage increase or decrease and want to find the original value, divide by (1 + rate) or (1 − rate). For example, if a price after 20% VAT is £120, the pre-VAT price is £120 ÷ 1.20 = £100. Similarly, if a sale price after 25% off is £60, the original was £60 ÷ 0.75 = £80.