Enter the original price and discount percentage to find the sale price and your total savings.
Enter your details and click Calculate
Sale price, total savings, effective discount %, and tax-adjusted totals will appear here instantly.
Discount Formulas — Percent Off, Stacking, and Reverse Pricing Explained
Most people assume stacked discounts add up. They don't — and that one misunderstanding costs shoppers real money. Here's every formula you need.
Standard Percent Off
Stacked / Sequential Discounts
Why Stacked Discounts Don't Add Up
Reverse — Find Original Price
BOGO — True Effective Discount
Discount with Sales Tax
- Always apply discount first, then add sales tax
- Final = Original × (1 − Discount%) × (1 + Tax%)
- Example: $100, 20% off, 8% tax → $80 × 1.08 = $86.40
- You save the tax on the discounted portion too
Discount Reference Tables (2026)
Quick lookup for the most common price and discount combinations. Use the calculator above for any exact value.
Percent Off Quick Reference — Sale Price
| Original Price | 10% off | 15% off | 20% off | 25% off | 30% off | 40% off | 50% off |
|---|---|---|---|---|---|---|---|
| $20 | $18.00 | $17.00 | $16.00 | $15.00 | $14.00 | $12.00 | $10.00 |
| $25 | $22.50 | $21.25 | $20.00 | $18.75 | $17.50 | $15.00 | $12.50 |
| $30 | $27.00 | $25.50 | $24.00 | $22.50 | $21.00 | $18.00 | $15.00 |
| $40 | $36.00 | $34.00 | $32.00 | $30.00 | $28.00 | $24.00 | $20.00 |
| $50 | $45.00 | $42.50 | $40.00 | $37.50 | $35.00 | $30.00 | $25.00 |
| $60 | $54.00 | $51.00 | $48.00 | $45.00 | $42.00 | $36.00 | $30.00 |
| $75 | $67.50 | $63.75 | $60.00 | $56.25 | $52.50 | $45.00 | $37.50 |
| $80 | $72.00 | $68.00 | $64.00 | $60.00 | $56.00 | $48.00 | $40.00 |
| $100 | $90.00 | $85.00 | $80.00 | $75.00 | $70.00 | $60.00 | $50.00 |
| $120 | $108.00 | $102.00 | $96.00 | $90.00 | $84.00 | $72.00 | $60.00 |
| $150 | $135.00 | $127.50 | $120.00 | $112.50 | $105.00 | $90.00 | $75.00 |
| $200 | $180.00 | $170.00 | $160.00 | $150.00 | $140.00 | $120.00 | $100.00 |
| $250 | $225.00 | $212.50 | $200.00 | $187.50 | $175.00 | $150.00 | $125.00 |
| $300 | $270.00 | $255.00 | $240.00 | $225.00 | $210.00 | $180.00 | $150.00 |
| $400 | $360.00 | $340.00 | $320.00 | $300.00 | $280.00 | $240.00 | $200.00 |
| $500 | $450.00 | $425.00 | $400.00 | $375.00 | $350.00 | $300.00 | $250.00 |
Stacked Discounts — True Effective % (not additive)
| Discount 1 | Discount 2 | Effective Total | What People Think | Over-Estimate |
|---|---|---|---|---|
| 10% | 5% | 14.5% | 15% | +0.5% over |
| 15% | 10% | 23.5% | 25% | +1.5% over |
| 20% | 10% | 28.0% | 30% | +2.0% over |
| 20% | 15% | 32.0% | 35% | +3.0% over |
| 25% | 10% | 32.5% | 35% | +2.5% over |
| 25% | 20% | 40.0% | 45% | +5.0% over |
| 30% | 10% | 37.0% | 40% | +3.0% over |
| 30% | 20% | 44.0% | 50% | +6.0% over |
| 40% | 10% | 46.0% | 50% | +4.0% over |
| 50% | 20% | 60.0% | 70% | +10.0% over |
BOGO Deals — True Effective Savings per Item
| Deal | Face Claim | Effective % per Item | Cost for 2 Items at $50 each |
|---|---|---|---|
| Buy 1 Get 1 Free (BOGO 100%) | "Get one FREE" | 50.0% | $50 |
| Buy 1 Get 1 50% Off (BOGO 50%) | "50% off second item" | 25.0% | $75 |
| Buy 2 Get 1 Free | "Free item!" | 33.3% | $66.67 avg per item |
| Buy 3 Get 1 Free | "Free item!" | 25.0% | $37.50 avg per item |
| Buy 2 Get 2 Free | "BOGO x2!" | 50.0% | $50 avg per item |
| 20% Off All + 10% Coupon | "Up to 30% off" | 28.0% | $36 (not $35) |
How to Get the Most from Discounts — What Retailers Don't Tell You
Discount marketing is designed to make savings feel larger than they are. These strategies help you compare deals accurately.
Verify the "Original" Price
In 2026, retailers commonly inflate original prices before applying discounts. A "$200 item, 50% off" may routinely sell for $100. Research the typical price before assuming any discount is genuine.
Order Matters for Stacked Discounts
If you have both a fixed-dollar coupon ($10 off) and a percentage coupon (20% off), the order of application affects your total. Apply the percentage discount first when the item is at full price for maximum savings.
BOGO vs Outright Discount
BOGO Free = 50% off per item only if you need two. If you only need one item, a straightforward 30% off is better than a BOGO deal you'll partially waste.
Stacking Credit Card Rewards
Credit card cashback and rewards stack on top of retailer discounts and apply to the post-discount price. A 2% cashback card on a $72 final price (after stacked discounts) gives you $1.44 back — use our Stack mode to factor this in as a third discount.
Sales Tax Reduces Your Net Savings
Tax is applied after discount. A $100 item at 20% off with 10% tax costs $72 — you saved $20 on the item but still paid $7.20 in tax. Our calculator shows both the pre-tax and post-tax totals so you know exactly what leaves your wallet.
Bulk Pricing: Calculate Cost Per Unit
Bulk discounts look attractive but only make sense if you'll use the quantity. Use our Bulk mode to compare the per-unit cost at each tier against buying exactly what you need.
Discount Calculator — Frequently Asked Questions
Answers to the most common questions about calculating sale prices, stacking discounts, BOGO deals, and reverse pricing.