📊 Solve Any Percentage Problem Instantly
Percentages show up everywhere — tips, taxes, discounts, test scores, interest rates, sales growth. This calculator handles all four major percentage calculations you'll ever need, with clear step-by-step results.
🎯 The 4 Types of Percentage Problems
1. What is X% of Y?
Example: What is 15% of $80? → $12
2. X is what % of Y?
Example: 30 is what % of 150? → 20%
3. % Increase / Decrease
Example: $50 → $65 = 30% increase
4. Percent Difference
Between two values, either direction
💡 Common Everyday Uses
- Tips at restaurants — 15%, 18%, 20% of the bill
- Sales tax — Add 6–10% to purchase price
- Discounts — "30% off" means multiply by 0.70
- Test scores — 45/50 = 90%
- Investment returns — Portfolio grew 12% this year
- Body weight — Lost 8% of starting weight
📐 Quick Formula Reference
- % of a number = (percent ÷ 100) × number
- X is what % of Y = (X ÷ Y) × 100
- % change = ((new − old) ÷ old) × 100