Frequently Asked Questions
How is discount percentage calculated?
Discount % = (Original Price - Sale Price) / Original Price × 100. For example, $100 item sold for $70 has a 30% discount.
How do stacked discounts work?
Stacked discounts are applied sequentially. A 30% off then 10% off equals 37% total discount (1 - 0.7 × 0.9 = 0.37), not 40%.
Can I calculate tax on the discounted price?
Yes, this calculator can show the final price including sales tax applied to the discounted amount.
Updated 2026 — latest rates