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Calculadora de porcentajes

Usa una sola página para calcular el porcentaje de un valor, la proporción de una parte y el cambio porcentual.

Matematicas Esperando resultado
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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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