Percentage Calculator

Three percentage problems solved: of, is-what-percent, and change. Calculate percentages three ways: X% of a number, what percent X is of Y, and percentage increase or decrease between two values. Free percentage calculator.

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À propos de Percentage Calculator

Almost every percentage question is one of three shapes: what is 15% of 240, what percent is 30 of 120, and what is the change from 80 to 100. This calculator answers all three in one place with labelled inputs, so you never have to remember which way to divide. Results appear instantly as you type, and each mode shows the calculation it performed — useful for homework checks, discounts, taxes, tips and growth reports.

Comment utiliser Percentage Calculator

  1. Pick the mode matching your question.
  2. Enter the two numbers.
  3. Read the result — it updates as you type.
  4. Check the shown working for homework or reports.

Fonctionnalités clés

How do I calculate percentage change?
Subtract the old value from the new value, divide by the old value, and multiply by 100. A change from 80 to 100 is (100−80)/80 × 100 = 25%.
Why is a 50% increase followed by a 50% decrease not zero?
Percentages apply to different bases: 100 up 50% is 150, and 150 down 50% is 75. Percentage change always depends on which number is the reference.

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