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Calculateur de pourcentage

Calculez rapidement une part en pourcentage, la proportion d’une partie et le taux de variation entre deux valeurs.

Maths Resultat en attente
Signaler un probleme

Calculation type

Example: what percent is 30 of 120?

Formula

A (part) ÷ B (whole) × 100

Quick examples

Tap an example to fill the inputs.

Inputs

Example: what percent is 30 of 120?

A is

25%

30 is 25% of 120.

Remaining

75%

As decimal

0,25

As fraction

30 / 120

Visual ratio

A
B
A 25%B 75%

How to read A and B

A is usually the number you check first, and B is the whole or base. Each input explains whether it is a part, whole, old value, or new value.

Formula

  • A as % of B: A (part) ÷ B (whole) × 100
  • A% of B: A (%) ÷ 100 × B (whole)
  • Simplify A:B: Divide A and B by the same greatest common factor
  • Solve A:B = C:?: If A:B = C:X, then X = C × B ÷ A
  • Compare old and new: (new - old) ÷ old × 100

Tips

  • For scores, discounts, and fees, use A as the part and B as the whole.
  • Use ratio simplify for screen sizes, recipes, or mixes.
  • Use A:B = C:? when keeping the same ratio for a new base.

Frequently Asked Questions

How do I remember A and B?v

For 30 out of 120, enter A=30 and B=120. A is the part, B is the whole.

Can I use this for money?v

Yes. Use A% of B for discounts, tax, tips, and fees.

Can it simplify decimals?v

Yes. Decimal ratios are scaled before being reduced.

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