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Percentage Calculator
Calculate percentages instantly with 5 different modes. Find percentages, percentage change, increases, decreases, and more.
What is X% of Y?
Find the percentage of a number. Example: What is 20% of 150?
X is what % of Y?
Find what percentage one number is of another. Example: 30 is what % of 150?
Percentage Change
Calculate the percentage increase or decrease between two values. Example: From 80 to 100.
Increase by Percentage
Add a percentage to a number. Example: Increase 200 by 15%.
Decrease by Percentage
Subtract a percentage from a number. Example: Decrease 200 by 15%.
Why Use Our Percentage Calculator?
5 Calculation Modes
From basic percentages to increases, decreases, and changes — all in one tool.
Instant Results
See results as you type. No need to press a button — calculations happen in real-time.
Formula Reference
Each calculator shows the exact formula used, helping you learn the math behind percentages.
Mobile Friendly
Works perfectly on phones, tablets, and desktops. Calculate percentages anywhere.
100% Private
All calculations happen in your browser. No data is sent to any server.
Free Forever
No signup, no limits, no hidden fees. Use it as many times as you need.
Understanding Percentages
What is a Percentage?
A percentage is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign, "%". For example, 45% (read as "forty-five percent") is equal to 45/100, or 0.45.
Percentages are used to express how large or small one quantity is relative to another. They're essential in everyday life — from calculating discounts and tips to understanding statistics and financial data.
Basic Percentage Formulas
- Find X% of Y:
(X / 100) × Y - X is what % of Y:
(X / Y) × 100 - Percentage Change:
((New - Old) / |Old|) × 100 - Increase by P%:
X + (X × P / 100) - Decrease by P%:
X - (X × P / 100)
Common Percentage Conversions
| Percentage | Fraction | Decimal |
|---|---|---|
| 1% | 1/100 | 0.01 |
| 10% | 1/10 | 0.10 |
| 25% | 1/4 | 0.25 |
| 50% | 1/2 | 0.50 |
| 75% | 3/4 | 0.75 |
| 100% | 1/1 | 1.00 |
| 150% | 3/2 | 1.50 |
| 200% | 2/1 | 2.00 |
Real-World Examples
Shopping Discounts: A $80 item with a 25% discount costs $60. Calculation: $80 - ($80 × 0.25) = $60.
Tips: A 15% tip on a $50 restaurant bill is $7.50. Calculation: $50 × 0.15 = $7.50.
Salary Raise: A 10% raise on a $50,000 salary gives you $55,000. Calculation: $50,000 + ($50,000 × 0.10) = $55,000.
Tax: 8% sales tax on a $100 purchase is $8. Total: $108. Calculation: $100 × 1.08 = $108.
Frequently Asked Questions
How do I calculate 20% of a number?
To calculate 20% of any number, multiply the number by 0.20 (or divide by 5). For example, 20% of 150 = 150 × 0.20 = 30. You can also use our "% of Number" calculator above for instant results.
How do I calculate percentage increase?
Use the formula: ((New Value - Original Value) / Original Value) × 100. For example, if a price goes from $50 to $65, the increase is ((65-50)/50) × 100 = 30%.
What is the difference between percentage change and percentage difference?
Percentage change has a direction (increase or decrease) from an original value. Percentage difference is the absolute difference between two values divided by their average, always positive. Use percentage change when comparing before/after values.
How do I calculate a discount percentage?
To find the discount amount: Original Price × (Discount % / 100). To find the final price: Original Price - Discount Amount. For example, 30% off $100 = $100 × 0.30 = $30 discount, final price = $70.
Can percentage be more than 100%?
Yes! Percentages can exceed 100%. For example, if you had $100 and now have $250, that's a 150% increase. 200% means double the original amount. Percentages over 100% simply mean the value is more than the reference amount.
How do I convert a decimal to a percentage?
Multiply the decimal by 100 and add the % sign. For example, 0.75 × 100 = 75%. To convert a percentage to a decimal, divide by 100: 75% ÷ 100 = 0.75.
Is this calculator free to use?
Yes, 100% free with no limits, no signup required, and no hidden fees. Use it as many times as you need for school, work, or personal calculations.
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The most versatile free percentage calculator on the web. No downloads, no signup, just math.
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