Math Tools5 min read•2026-05-30
Percentage Calculator Free: Calculate Percentages Online
By FreeToolbox Team
Percentage Calculator Free: Calculate Percentages Online
Need to calculate a percentage? Our free calculator handles all common percentage calculations.
Common Percentage Calculations
| Type | Example | Result |
|---|---|---|
| Percent of number | 15% of 200 | 30 |
| Percentage increase | 50 to 75 | +50% |
| Percentage decrease | 80 to 60 | -25% |
| What percent is X of Y | 30 of 150 | 20% |
Why Calculate Percentages?
- Shopping discounts (30% off)
- Interest rates and tax calculations
- Grade percentages and GPA
- Profit margins and growth rates
- Body fat percentage
FreeToolbox Percentage Calculator
Features: - 100% free, no registration - Multiple calculation types - Instant results - Step-by-step explanation
Try: [Percentage Calculator](/tools/percentage-calculator)
How to Use
Percentage of a Number 1. Enter the percentage (e.g., 25) 2. Enter the number (e.g., 200) 3. Result: 25% of 200 = 50
Percentage Change 1. Enter original value 2. Enter new value 3. Get increase or decrease percentage
Real-World Examples
- 30% off a $150 jacket: Save $45, pay $105
- 5% raise on $60,000: New salary $63,000
- 18% tip on $85: Tip $15.30, total $100.30
Quick Mental Math Tips
- 10% = Move decimal left (10% of 250 = 25)
- 5% = Half of 10% (5% of 250 = 12.5)
- 20% = Double 10% (20% of 250 = 50)
- 50% = Divide by 2 (50% of 250 = 125)
Frequently Asked Questions
**Q: How do I calculate percentage increase?** A: ((New - Old) / Old) x 100
**Q: Can I chain percentages?** A: They are multiplicative, not additive. 10% then 10% = 21% total.
[Percentage Calculator](/tools/percentage-calculator)