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Percentage calculator

Three everyday percentage sums, answered as you type.

What do you want to find?
%

Answer

360

15% of 2,400 = 15 ÷ 100 × 2,400 = 360

Results are exact, shown to up to four decimal places.

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How to calculate a percentage

  1. 1

    Pick the question you want answered.

  2. 2

    Type the two numbers.

  3. 3

    Read the answer and the working underneath, and copy it if you need it.

Three calculators in one

  • X% of Y: what is 15% of 2,400? It’s 360. Use it for tips, commissions, GST on a price or a share of a bill.
  • X is what % of Y: what percentage is 452 out of 500? It’s 90.4%. Use it for exam marks, attendance or a budget share.
  • Percentage change: how much did a price go from 80 to 100? A 25% increase. Use it for salary hikes, price rises or growth.

A percent calculator for everyday sums: percentage of marks calculator and percentage increase calculator.

Each answer shows the working underneath, so it’s easy to check or copy into homework or a report.

Formulas

  • Percentage of a number: (X ÷ 100) × Y
  • Percentage one number is of another: (X ÷ Y) × 100
  • Percentage change: (new − old) ÷ old × 100

Common mix-ups

Percentage points vs percent. If an interest rate goes from 8% to 9%, that’s a rise of 1 percentage point but a 12.5% increase.

Reversing a change. A 20% fall followed by a 20% rise doesn’t return to the start: 100 → 80 → 96. To undo a 20% fall you need a 25% rise.

Marks to percentage and CGPA. For CBSE, the commonly used conversion is CGPA × 9.5. Check your board or university’s own rule if it matters for an application.

Results are shown to up to four decimal places. Copy the answer and working with one tap.

Frequently asked questions

How do I calculate the percentage of marks?

Divide marks obtained by total marks and multiply by 100. For 452 out of 500: 452 ÷ 500 × 100 = 90.4%. Use “X is what % of Y”.

How do I calculate a percentage increase?

Subtract the old value from the new one, divide by the old value and multiply by 100. From 80 to 100 is a 25% increase.

Why is a 20% fall not undone by a 20% rise?

Because the second percentage is of a smaller number. 100 falls 20% to 80, and 20% of 80 is only 16, giving 96.

How many decimal places are shown?

Up to four, with trailing zeros removed, so 33.3333% or 25%.

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