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Percentage Calculator Online

Calculate percentages, percentage change, and what percent one number is of another

Como usar Calculadora de Porcentagem

  1. 1

    Choose calculation type

    Select from 'X% of Y', 'X is what % of Y', or 'Percentage change'.

  2. 2

    Enter values

    Fill in the number fields — the result updates instantly.

  3. 3

    Read the formula

    The formula used is shown alongside the answer for transparency.

Perguntas frequentes

Is my data safe?
Yes. All processing happens entirely in your browser. Your data never leaves your device and is never uploaded to any server.
What types of percentage calculations are supported?
Three core calculation types: (1) What is X% of Y? (e.g., 15% of 200 = 30), (2) X is what percentage of Y? (e.g., 30 is what % of 200 = 15%), and (3) What is the percentage change from X to Y? (e.g., 200 to 230 = 15% increase).
How is percentage change calculated?
Percentage change = ((New Value - Old Value) / Old Value) × 100. A positive result indicates an increase; a negative result indicates a decrease.
Can it calculate percentage decrease?
Yes. Enter the original (higher) value as the starting number and the new (lower) value as the ending number. The result will be a negative percentage indicating the decrease.
Why is percent different from percentage points?
A percentage point is the arithmetic difference between two percentages. If interest rates rise from 2% to 5%, that is a 3 percentage point increase, but a 150% relative increase. These are different measures and are often confused in financial reporting.

Saiba mais

O que é Percentage Calculator?

Calculate percentages, percentage changes, and percentage of totals instantly. Find what percent X is of Y, calculate percentage increase or decrease between two values, or work out what value equals a given percentage. All calculations happen instantly in your browser — no sign-up, no server required.

Por que usar Percentage Calculator?

  • Multiple calculation modes — 'X% of Y', 'X is what % of Y', and 'percentage change from X to Y'.
  • Instant results — calculations update as you type, no button needed.
  • Shows formula alongside the answer so you can understand and verify the math.
  • Handles negative percentage changes (decreases) correctly.
  • Completely private — no data is sent anywhere.

Casos de uso de Percentage Calculator

Sales discounts and pricing

Calculate discounted prices (20% off $85), tax amounts, or profit margins for retail pricing decisions.

Grade and score calculations

Find what percentage score you got on a test (45 out of 60 correct = what percent?).

Financial growth and change

Calculate percentage increase in revenue, stock price, or investment returns between two periods.

Statistics and data analysis

Calculate what fraction of a total a subset represents — for example, 230 out of 1500 survey respondents = what percent?

Dicas e boas práticas

  • 💡To find the original price before a discount: divide the sale price by (1 - discount%). E.g., $80 after a 20% discount means the original was $80 / 0.8 = $100.
  • 💡Percentage change = (New Value - Old Value) / Old Value × 100. A negative result means a decrease.
  • 💡Percentage of total: (Part / Total) × 100. This is the most common type of percentage question.
  • 💡Tip amount: multiply the bill total by the tip percentage (e.g., $45 × 0.18 = $8.10 tip for 18%).

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