Percentage Calculator

Work out percentages three ways — marks, discounts, increases and shares.

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About this tool

Three percentage questions run daily life, and they are all here: What is 18% of 2,450? You scored 342 out of 400 — what percent is that? A price climbed from 800 to 950 — by how much, really? Each mode answers in one step, with the formula written underneath so you can show your working, not just your answer.

Students live in the second mode during result season. Shopkeepers live in the first during sale season. And the third mode has saved many people from a “50% off, then 50% more off” misunderstanding — which, as this calculator will happily show you, is not 100% off.

How to use the Percentage Calculator

Choose the type of calculation you need.

Enter the two numbers.

The answer appears with the formula used.

Questions people ask

How do I calculate my marks percentage?

Use the second mode: marks obtained and total marks. For 342 out of 400, that is (342 ÷ 400) × 100 = 85.5%.

How is a percentage increase calculated?

(New − Old) ÷ Old × 100. Going from 800 to 950 is (150 ÷ 800) × 100 = an 18.75% increase.

A shop gives 20% off, then another 10% off. Is that 30% off?

No — the second discount applies to the already-reduced price. On 1,000: 20% off leaves 800, then 10% off that leaves 720. Total discount: 28%, not 30%.

Can I use decimals?

Yes, all fields accept decimal numbers, and the result is rounded sensibly to two decimal places.

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