Percentages and discounts

Choose a calculation and see the formula beside the result.

Calculation type

Use a decimal point or comma. Spaces can separate thousands.

The calculation runs in your browser. Inputs and results are not saved or sent to the server.

How this was calculated

One percent is one hundredth. Choose the mode for your task: the same percentage can require a different calculation.

Percentage change keeps the original value’s sign in the denominator: −100 to −50 gives −50%.

How we calculate
  • Percent of a number: Base × percentage ÷ 100
    12.5% of 240 = 240 × 12.5 ÷ 100 = 30.00.
  • Percentage share: Part ÷ base × 100
    7 out of 20 = 7 ÷ 20 × 100 = 35.00%.
  • Percentage change: (New value − original value) ÷ original value × 100
    80 → 100: (100 − 80) ÷ 80 × 100 = 25.00%.
  • Discounted price: Price × (100 − discount) ÷ 100
    €80 with a 12.5% discount: 80 × 87.5 ÷ 100 = €70.00.

These are ordinary arithmetic operations. No tax year, statutory rates or tax rules apply to this calculator.

Sources and methodology →

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