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Calculadora de Porcentagem Grátis

Calcule porcentagens instantaneamente — rápido, privado e grátis.

PercentEase is a free online percentage calculator that solves five types of problems: finding X% of Y, determining what percent X is of Y, calculating percentage change, finding the whole from a known part and percentage, and computing increase or decrease by a percentage. All calculations run instantly in your browser with no data collected. Available in 20 languages with no sign-up required.

How Do You Use PercentEase?

  1. 1

    Choose Your Calculation Mode

    Select from five modes: find X% of Y, determine what percent X is of Y, calculate percentage change, reverse-solve, or increase/decrease by a percentage.

  2. 2

    Enter Your Numbers

    Type your values into the input fields. Results appear instantly as you type.

  3. 3

    Copy Your Result

    Your answer appears immediately below the inputs with the formula and calculation shown.

Common Percentage Calculations

ProblemAnswer
What is 10% of 100?10
What is 15% of 200?30
What is 20% of 50?10
What is 25% of 80?20
What is 30% of 150?45
What is 50% of 60?30
15 is what % of 75?20%
7 is what % of 28?25%
Change from 40 to 5025% increase
Change from 200 to 15025% decrease
What is 12.5% of 400?50
45 is what % of 180?25%

Real-World Percentage Examples

Restaurant Tip

Your dinner bill is $65. You want to leave an 18% tip.

Tip = $65 × 18 ÷ 100

$11.70

Sale Discount

A jacket costs $120 and is 35% off.

Discount = $120 × 35 ÷ 100

You save $42 — pay $78

Test Score

You scored 42 out of 50 on an exam.

Grade = (42 ÷ 50) × 100

84%

Price Change

Gas went from $3.20 to $3.84 per gallon.

Change = (($3.84 − $3.20) ÷ $3.20) × 100

20% increase

Fraction ↔ Decimal ↔ Percentage

FractionDecimalPercentage
1/20.550%
1/30.33333.33%
2/30.66766.67%
1/40.2525%
3/40.7575%
1/50.220%
2/50.440%
3/50.660%
4/50.880%
1/80.12512.5%
3/80.37537.5%
1/100.110%

Entendendo Porcentagens

Uma porcentagem é um número expresso como fração de 100. A palavra vem do latim 'per centum', significando 'por cento'.

Exemplos Rápidos

  • • Quanto é 20% de 150? → 30
  • • 15 é qual % de 60? → 25%
  • • Variação de 50 para 75 → aumento de 50%

Frequently Asked Questions

Uma porcentagem é uma forma de expressar um número como fração de 100. O símbolo % representa 'por cento'. Por exemplo, 50% significa 50 de 100, ou metade.
Para encontrar X% de Y, multiplique Y por X e divida por 100. Exemplo: 20% de 150 = 30.
Divida a parte pelo todo e multiplique por 100. Exemplo: 30 é qual % de 150? → 20%.
Subtraia o valor antigo do novo, divida pelo valor antigo absoluto e multiplique por 100.
Sim! Completamente grátis. Sem cadastro, sem coleta de dados.
View all FAQs →