ZYBERMART

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Calculadora de porcentagem

Resolva os problemas de porcentagem mais comuns: X% de um número, quantos por cento um número é de outro e aumento ou redução percentual.

What is X% of Y?

What is % of ?

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X is what percent of Y?

is what % of ?

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Percentage change

From to

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Increase or decrease by a percentage

%

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Percentage formulas

A percentage is a number expressed as a fraction of 100. These four formulas cover almost every everyday percentage question:

QuestionFormulaExample
What is X% of Y?Y × X ÷ 10015% of 80 = 12
X is what % of Y?X ÷ Y × 10012 is 15% of 80
% change from X to Y(Y − X) ÷ |X| × 10050 → 65 = +30%
Increase X by Y%X × (1 + Y ÷ 100)200 + 10% = 220

Everyday uses

  • Discounts: 25% off a $60 item saves $15, so you pay $45.
  • Tips: a 20% tip on a $45 bill is $9.
  • Pay rises: a raise from $3,000 to $3,150 a month is a 5% increase.
  • Grades: 42 correct answers out of 50 is 84%.
  • Sales tax and VAT: adding 8% tax to $50 gives $54.

Frequently asked questions

How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. For example, 15% of 80 is 80 × 15 ÷ 100 = 12.

How do I calculate percentage change?

Subtract the old value from the new value, divide by the old value, and multiply by 100. Going from 50 to 65 is (65 − 50) ÷ 50 × 100 = a 30% increase.

What's the difference between percentage change and percentage points?

Percentage points measure the plain difference between two percentages, while percentage change is relative. An interest rate going from 4% to 5% rises by 1 percentage point, which is a 25% increase.

Why doesn't a 50% drop followed by a 50% rise get me back to where I started?

Because each percentage applies to a different base. 100 minus 50% is 50, and 50 plus 50% is only 75. To get back to 100 from 50 you need a 100% increase.

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