Percentage Calculator
Created by a developer who needed simple tools
Calculate percentages easily for discounts, tips, tax, and more.
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Quick Examples
How to Calculate Percentages
1. Percentage of a Number
To calculate X% of Y, multiply Y by (X/100). Example: 15% of 200 = 200 × (15/100) = 30.
2. What Percent is X of Y?
Divide X by Y, then multiply by 100. Example: 30 is what % of 200? (30/200) × 100 = 15%.
3. Percentage Change
To find % increase/decrease: (New - Original) / Original × 100. Positive = increase, Negative = decrease.
Real-World Uses
- Discounts: Save 20% on a $50 item = $10 off
- Restaurant Tips: 15% tip on $80 = $12
- Sales Tax: 8% tax on $100 = $8
- Grade Calculator: 45/60 points = 75%
- Investment Returns: $1000 to $1200 = 20% gain
Frequently Asked Questions
How do I calculate a discount?
Multiply the original price by the discount percentage, then subtract from original price.
How to calculate percentage increase in salary?
(New salary - Old salary) / Old salary × 100 = % raise.
What is 10% of 250?
10% of 250 = 25.
How to calculate test score percentage?
(Points earned / Total points) × 100 = percentage score.