Everyday · Shopping
Discount Calculator
What will you actually pay? Find the sale price, add an "extra % off" coupon, include sales tax, and see the real discount you're getting.
Your result
—
How it's calculated
Sale price = Price × (1 − D1) × (1 − D2)
Total = Sale price × (1 + Tax) Stacked discounts multiply; they don't add. 20% off then 10% off is 28% off, not 30%.
Total = Sale price × (1 + Tax) Stacked discounts multiply; they don't add. 20% off then 10% off is 28% off, not 30%.
Worked example
$100 with 20% off, then an extra 10% off, plus 8% tax:
- $100 × 0.80 = $80, then × 0.90 = $72 (a 28% total discount)
- With 8% tax: $72 × 1.08 = $77.76
Common questions
Why isn't "20% + 10% off" the same as 30% off?
The second discount is taken from the already-reduced price, so it's worth less than it sounds.
Is sales tax charged on the original or sale price?
Usually on the price you actually pay after discounts, which is how this calculator works. Some coupons and rebates are taxed differently.
Need other percentage math? Try the percentage calculator.