Sale price breakdown
Formula
sale = original x (1 - d1) x (1 - d2)
tax = sale x taxRate
final = sale + tax
Quick examples
- $80 with 20% off becomes $64 before tax.
- Stacking 20% and 10% off is not the same as 30% off.
- A higher tax rate changes the checkout total, not the savings amount.
How it works
The calculator applies each discount in sequence. If you enter a second discount, it is taken from the already discounted price rather than from the original price. Tax is then added to the sale price.
This matters because stacked discounts compound. A 25% discount followed by a 10% discount produces an effective markdown of 32.5%, not 35%.
Use this for coupon math, clearance comparisons, and checking whether a second promotion actually changes the total enough to matter.