Examples:
- 20% discount on $500 → Mode: "A% of B"
- $30 is what % of $100? → Mode: "A is what % of B?"
- $50,000 salary with 10% raise → Mode: "A + B% increase"
🔢 What is Percentage Calculator?
Percentage Calculator solves various percentage problems with four easy modes. Calculate discounts, find ratios, apply increases or decreases—all common percentage operations you need daily. The formula is displayed alongside results so you can understand how the calculation works. Perfect for shopping discounts, tax calculations, growth analysis, and grade conversions.
📊 Percentage Calculation Types
| Mode | Formula | Example Use |
|---|---|---|
| A% of B | A/100 × B | 20% discount on $500 |
| A is what % of B? | A/B × 100 | 30 is what % of 100? |
| A + B% increase | A × (1 + B/100) | $50k salary + 10% raise |
| A - B% decrease | A × (1 - B/100) | Stock $100 down 15% |
💡 Percentage Calculation Tips
- Discounted price: Original × (1 - discount rate) = final price
- Tax included: Price × 1.0825 for 8.25% sales tax
- Sequential changes: 10% up then 10% down ≠ original (actually 99%)
- Reverse calculation: If 30% is $150, total is $150 ÷ 0.3 = $500
Frequently Asked Questions
How do I find the original price from a discounted price?▼
Divide the discounted price by (1 - discount rate). Example: If $80 is the price after 20% off, original is $80 ÷ 0.8 = $100.
Is two 50% discounts the same as free?▼
No. The second 50% applies to the already-discounted price. Two 50% discounts result in 25% of the original price (75% total discount).
Why does 20% up then 20% down not equal the original?▼
The decrease applies to the larger increased amount. Starting at 100: +20% = 120, then -20% of 120 = 96. You lose 4%.
What is Percentage Calculator?
Calculate any percentage quickly: X% of Y, what percent A is of B, percentage change between values, and discount prices. Essential for math, shopping, and finance.