Discount Calculator
Sale price and real saving, including stacked and multi-buy offers.
How this works
Sale price = Original × (1 − Discount ÷ 100)
Original = Sale price ÷ (1 − Discount ÷ 100)
- Stacked discounts multiply, never add: $200 → $140 → $112.
- Tax applies after the discount, so a discount lowers the tax too.
- A multi-buy only saves money on items you would have bought anyway.
Currency
- Amounts follow the currency selected above.
Is 30% off plus 20% off the same as 50% off?
No. The second discount applies to the already-reduced price, giving 44% off in total. A $200 item costs $112, not $100.
How do I find the original price from a sale price?
Divide by 1 minus the discount as a decimal. A $90 item after 25% off was originally 90 ÷ 0.75 = $120.
Is tax charged before or after the discount?
Almost always after. Sales tax, VAT and GST apply to what you actually pay, so a discount lowers the tax too.
How do I work out the discount percentage between two prices?
Subtract the sale price from the original, divide by the original, then multiply by 100. A $120 item marked down to $90 saved $30 ÷ $120 = 25% off.
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