How to use the Complete Guide to Discount Calculations
Discount math shouldn't be a guessing game. Whether you're standing in a store aisle or shopping online, knowing the real price (after that "20% Off" sticker and sales tax) is the key to smart spending. Use this tool to find your final price in seconds.
💰 Tax Comes Last
In most regions, sales tax is calculated on the discounted price, not the original sticker price. This saves you a little extra money!
🏷️ The "Stacking" Trap
Be careful with "Extra 20% Off" signs. They usually apply to the already reduced price, not the original. (50% off + 20% off ≠ 70% off. It's actually 60% off).
The Formula
Sale Price = (Original - Discount) + Tax
Common Shopping Discounts Explained
| Discount Type | $100 Item | You Pay |
|---|---|---|
| 10% Off | Save $10 | $90 |
| 25% Off | Save $25 | $75 |
| 50% Off | Save $50 | $50 |
| Buy 1 Get 1 50% | Save $50 on 2 | $150 for 2 |
🧠 The Psychology of Discounts
- Anchoring: Stores show a high "Original Price" to make the sale price feel like a steal, even if the item is never sold at full price.
- Urgency: "Sale ends tonight!" triggers FOMO (Fear Of Missing Out), causing impulse buys.
- Decoy Pricing: Placing a $100 item next to a $200 item makes the first one seem cheap, even if it's overpriced.