Percentage Calculator - Free Online Percent Tool
Fast, accurate percentage calculations for everyday use. Calculate percentages, find ratios, and convert between formats instantly.
No calculations yet. Use the tools on the right to start calculating.
What is X% of Y?
X is what % of Y?
X is Y% of what?
Percentage change
Percent ↔ Fraction/Decimal
Expression Calculator
📊 What is a Percentage Calculator?
A percentage calculator is a tool that helps you quickly perform calculations involving percentages. Percentages represent fractions of 100 and are used everywhere - from shopping discounts and tax calculations to exam scores and financial analysis.
Simple Examples:
🔧 Understanding Each Tool
① What is X% of Y?
Purpose: Find the actual amount represented by a percentage.
Example: Calculate a 15% tip on a $40 meal → 15% of 40 = $6
② X is what % of Y?
Purpose: Find what percentage one number is of another.
Example: If you scored 18 out of 20 → 18 is 90% of 20
③ X is Y% of what?
Purpose: Find the total when you know a part and its percentage.
Example: If $24 is 30% of your budget → 24 is 30% of 80
④ Percentage change
Purpose: Calculate percent increase or decrease.
Example: Price increased from $50 to $65 → 30% increase
⑤ Percent ↔ Fraction/Decimal
Purpose: Convert between different formats instantly.
Example: 75% = 3/4 = 0.75
⑥ Expression Calculator
Purpose: Type custom calculations like "20% × 80 + 10% × 80"
Example: 20% × 60 + 10% × 60 = 18
💡 Quick Tips
- All calculations happen in your browser - files are never uploaded
- Results are automatically saved in the left panel history
- You can use decimal percentages like 12.5% or 0.5%
- The converter automatically updates all three formats when you change any value
- Click the clear button (🗑️) to reset history anytime