Discount calculator
Work out the dollar saving and sale price from a percentage off.
What the result means
A discount is a percentage of the original price, subtracted from that original. 15% off $240 is $36, leaving $204 — not 15% of some other figure.
How it is calculated
Sale = original × (1 − %/100). Saving = original − sale
- Original: The ticketed price before the markdown.
The percentage always uses the original as the base. Two successive 10% discounts are not 20% off.
Assumptions
- Estimates only — not tax, legal, credit or financial advice. Check the official source or your contract before relying on a figure.
- A single percentage off one price, not stacked coupons.
Worked example
15% off $240
A jacket on sale.
- Saving
- $240 × 15% = $36
- Sale price
- $204
That is the decrease mode of a percentage, specialised for a price ticket.
GST sits on the price you actually pay
If a ticketed price already includes GST, the discounted price usually still includes GST. Use the GST calculator if you need the tax component of the sale price.
Questions
How do I stack two discounts?
Apply the first sale price as the new original. 10% then 10% is 19% off, not 20%.
Related calculators
- GSTAdd 10% GST, remove GST from an inclusive price, or see the GST component using the Australian 1/11 rule.
- PercentageFind a percentage of a number, reverse a percentage, or calculate percentage increase, decrease and difference.
- Margin & markupSee why a 25% markup is a 20% margin, and price from either figure.
Sources
business.gov.au
Finance and accounting for business
Last reviewed 2026-08-19
Everyday · Last reviewed 2026-08-19
Estimates only. Not tax, legal or financial advice. Check official sources before relying on a figure.
Printed from OzCalc (ozcalc.com). Last reviewed 2026-08-19. Estimates only — not tax, legal or financial advice.