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Percentage Calculator

Three modes — choose yours and get the result instantly.

Enter both values to see the result

10%

÷ 10

20%

÷ 5

25%

÷ 4

50%

÷ 2

What Can You Calculate with This Tool?

This percentage calculator covers the three most common percentage problems people face in everyday life. Whether you're working out a sale price, tracking a business metric, scoring a test, or calculating a restaurant tip — one of the three modes handles it directly without needing to remember a formula.

Common Use Cases

🛍️ Discounts & Sales

Work out sale prices instantly. What is 30% off £120?

📊 Growth Rates

Track business KPIs. Revenue went from £80k to £100k — what's the % increase?

🎓 Grades & Scores

Convert raw scores to percentages. Got 43 out of 60?

🏦 Tax & VAT

Calculate tax amounts. What is 20% VAT on £450?

💰 Tips & Gratuities

Split the bill fairly. 15% of £87.50 for a restaurant tip?

📈 Profit Margins

Compare costs and revenues. What percentage is £35 profit on a £200 sale?

Frequently Asked Questions

How do I calculate what is X% of Y?

Multiply Y by X and divide by 100. For example, 20% of 250 = (20 × 250) ÷ 100 = 50. The "What is X% of Y" mode does this automatically as you type.

How do I find what percentage X is of Y?

Divide X by Y and multiply by 100. For example, 50 is what % of 200? (50 ÷ 200) × 100 = 25%. Use the "X is what % of Y" mode for this.

How do I calculate percentage change?

Subtract the original value from the new value, divide by the original value, and multiply by 100. Formula: ((New − Old) ÷ |Old|) × 100. A positive result is an increase; negative is a decrease.

What is the quick mental maths trick for 10%?

To find 10% of any number, just move the decimal point one place to the left. For 350, 10% is 35. For 20%, double that: 70. For 5%, halve the 10% result: 17.5.

How do I calculate a discount?

Use the "What is X% of Y" mode. Enter the discount percentage as X and the original price as Y. Subtract the result from the original price to get the sale price.

What is the difference between percentage increase and absolute increase?

Absolute increase is the raw difference (e.g., £20 more). Percentage increase expresses that change relative to the starting value (e.g., 20% more). Percentage change is more useful for comparisons across different scales.

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