Percentage Calculator
Percentage Calculator
Calculate percentages instantly. Free, accurate, and 100% private.
📊 What Is X% of Y?
📊 Common Percentages
What Is a Percentage?
A percentage is a number expressed as a fraction of 100. The word comes from the Latin “per centum,” meaning “by the hundred.” The symbol % means “divided by 100,” so 25% is the same as 0.25 or 25/100.
The Formula
To find X% of Y:
Step-by-Step Example
Find 20% of 150:
- Divide: 20 / 100 = 0.20
- Multiply: 0.20 × 150 = 30
- Result: 20% of 150 = 30
Why Use Our Calculator?
Our tool is fast, accurate, and free. It shows the formula so you can learn the math. Everything runs in your browser — nothing is uploaded or stored.
Key Features
- ⚡ Instant results as you type
- 📐 Shows the formula used
- ⚡ Quick presets for common cases
- 📊 Reference chart (% to decimal to fraction)
- 📋 One-click copy of result
- 🔐 100% private
Perfect For
❓ FAQ
How do I calculate X% of a number?
Use the formula: Result = (X / 100) × Y. Example: 20% of 150 = (20 / 100) × 150 = 30.
Is this Percentage Calculator free?
Yes, our percentage calculator is 100% free with no signup and no limits.
How do I find percentage increase?
Formula: ((New − Old) / Old) × 100. Example: 100 → 120 = +20%.
How do I find the original price after a discount?
Use reverse percentage: Original = Final / (1 − % / 100). Example: after 20% off, price is 80 → original = 80 / 0.8 = 100.
How do I convert a percentage to a decimal?
Divide by 100. So 25% = 0.25, 50% = 0.5, 100% = 1.0.
How do I calculate a tip percentage?
Multiply the bill by the tip percent. 15% tip on $40 → 40 × 0.15 = $6.
What does “%” mean?
The % symbol means “per hundred” or “divided by 100.” It expresses a number as a fraction of 100.
Is my data stored or shared?
No. All calculations happen in your browser. Your values never leave your device.
Does it work on mobile?
Yes, our percentage calculator is fully responsive on phones, tablets, and desktops.
