Percentage Calculator

Make percentages make sense.

Calculate percentages in seconds. Find a percentage of a number, compare two values, calculate percentage changes or work backwards from a percentage.

⚡ Instant results 🔢 Four calculation modes 📚 Worked examples ✨ Free to use

🔢 Choose your calculation

What is X% of Y?

Find a percentage of any number. For example, 20% of 150.

Percentage (%)

Number

Enter a percentage and the number you want to calculate it from.

🧠 How to calculate percentages

A percentage represents a number out of 100. Percentages are useful for discounts, grades, price changes, statistics, financial calculations and everyday comparisons.

Percentage of a number = Number × Percentage ÷ 100

What percentage = Part ÷ Whole × 100

Percentage change = (New value − Original value) ÷ |Original value| × 100

🧮 Example: Finding 20% of 150

To calculate 20% of 150, divide 20 by 100 and multiply the result by 150.

That gives 0.20 × 150 = 30.

🎯 20% of 150 = 30

💡 Frequently Asked Questions

🔢 How do I calculate a percentage of a number?

Multiply the number by the percentage expressed as a decimal. For example, 15% of 200 is 200 × 0.15 = 30.

📈 How do I calculate percentage increase?

Subtract the original value from the new value, divide by the absolute value of the original, and multiply by 100. For example, increasing from 80 to 100 is a 25% increase.

📉 Can a percentage be negative?

Yes. A negative percentage can describe a decrease or a negative proportional relationship, depending on the calculation.

🔄 What is a reverse percentage?

A reverse percentage finds an original amount from a known percentage of it. For example, if 25% of a number is 50, the original number is 200.