Discount Calculator

The Discount Calculator helps you determine the final price of an item after applying a percentage discount. It shows you exactly how much you save and what you actually pay, making it easy to evaluate deals during sales, promotions, and coupon offers.

Understanding discounts is essential for smart shopping. A '50% off' deal sounds great, but a '$20 off' coupon might save you more depending on the item's price. Stacking discounts (like 20% off + an additional 10% off) doesn't equal 30% off — it's actually 28% off the original price. This calculator helps you avoid common discount traps.

How the Formula Works

Discount Amount = Original Price × (Discount % ÷ 100). Final Price = Original Price − Discount Amount. For stacked discounts: Final = Price × (1 − D1%) × (1 − D2%).

• Single discount: Savings = Price × Discount% ÷ 100
• Final price = Original − Savings
• Stacked discounts: Apply each discount sequentially, not additively
• Example: 20% + 10% off $100 = $100 × 0.80 × 0.90 = $72 (not $70)

How to Use This Calculator

1. Enter the original price of the item
2. Enter the discount percentage
3. View the discount amount and final price you'll pay
4. Optionally add sales tax to see the true total

Tips & Best Practices

• Always calculate the per-unit price when comparing 'buy one get one' vs. percentage-off deals
• Stacked discounts are not additive — 20% off + 10% off = 28% off, not 30%
• Compare the dollar savings, not just the percentage — 10% off a $500 item saves more than 50% off a $20 item
• Factor in sales tax when comparing online vs. in-store prices

Important Limitations

• Does not account for membership fees or minimum purchase requirements for certain discounts
• Cannot calculate BOGO (buy one get one) deals — use per-unit price comparison instead