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Calculate percentages without guessing the formula

Choose the question that matches your problem and see the working.

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Percentage Calculator

Choose the percentage question

Result

30

Substituted formula: (20 ÷ 100) × 150

What the percentage calculator answers

Five question-shaped modes cover percentage of a value, ratio as a percentage, percentage change, a value after a change, and the original value before a change. Each result includes the substituted arithmetic.

Common percentage questions

  • Find a portion, score, discount, markup, or completion rate.
  • Compare an old value with a new value as a percentage change.
  • Recover the original amount from a known increased or reduced result.

How to calculate a percentage

  1. Choose the percentage question you need to answer.
  2. Enter both values in the labeled prompt.
  3. Review the result and substituted formula, then copy it if needed.

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