Percentage Calculator - Easy Percentage Calculations
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What is Percentage?
Percentage means "per hundred" or "out of 100". It's a way to express a number as a fraction of 100. The word "percent" comes from Latin "per centum" meaning "by the hundred".
Percentage Formula
X% of Y = (X × Y) ÷ 100
Example: 20% of 500 = (20 × 500) ÷ 100 = 100
Other Percentage Calculations
- Percentage Increase: ((New - Old) ÷ Old) × 100
- Percentage Decrease: ((Old - New) ÷ Old) × 100
- X as % of Y: (X ÷ Y) × 100
Real-Life Examples
- Shopping Discount: $80 shirt with 20% off = $16 saved, pay $64
- Restaurant Tip: $45 meal with 18% tip = $8.10 tip, total $53.10
- Test Score: 45 correct out of 50 = 90% grade
- Sales Tax: $200 item with 10% tax = $20 tax, total $220
Common Percentage Uses
- Discounts and sales
- Interest rates on loans and savings
- Tax calculations
- Grade and score calculations
- Statistics and data analysis