Discount Calculator Australia
Enter the original price and discount percentage to calculate the final sale price and exact dollar saving instantly.
How to calculate a discounted price
Multiply the original price by the discount percentage to find the saving, then subtract that saving from the original price. For example, 25% off $80 saves $20 and gives a final price of $60.
On this page
Calculate sale price and total savings
Enter the original price and discount percentage to calculate the dollar saving and final sale price. The calculation is original price × (1 − discount ÷ 100), with currency rounding applied to the displayed result.
For stacked discounts, calculate them one after another. A further 20% off an item already reduced by 30% produces a combined 44% reduction, not 50%.
How this discount calculator works
Enter the original price and the advertised percentage off. The calculator turns the percentage into a dollar saving and subtracts it from the original price. For example, an $80 item at 25% off saves $20 and costs $60 before any additional checkout charges.
This tool calculates a single percentage discount. It does not automatically apply coupon stacking, delivery fees, loyalty credits or a minimum-spend promotion. If a second discount applies to the reduced price, calculate the first sale price and use that as the starting price for the next calculation.
For an Australian GST-inclusive shelf price, the displayed saving and sale price are also GST-inclusive if you enter that shelf price. A discount alone does not calculate the GST component of a tax invoice; use the GST Calculator for a separate GST calculation.
Discount percentage and sale price formula
Dollar saving = original price × (discount percentage ÷ 100). Sale price = original price − dollar saving. Equivalently, sale price = original price × (1 − discount percentage ÷ 100).
To work backwards from a marked-down price, percentage off = (original price − sale price) ÷ original price × 100, provided the original price is greater than zero. For example, reducing $79 to $59 saves $20; $20 ÷ $79 × 100 ≈ 25.32%.
Enter the same currency and GST basis when comparing two prices. The calculator displays cents after rounding; individual retailers may apply rounding or coupon restrictions differently at checkout.
How to check a sale price
- Find the original price shown for the item and enter it in dollars.
- Enter the advertised discount percentage, such as 20 for 20% off.
- Select Calculate and check the dollar saving and final sale price.
- For two successive offers, enter the first calculated sale price as the starting price for the second offer.
- When comparing different pack sizes or sellers, account for delivery and compare the unit price rather than the headline percentage alone.
Worked discount examples
20% off a $120 item
$120 × 0.20 = $24 saved; $120 − $24 = $96 sale price.
Two discounts applied one after the other
A $100 item at 30% off costs $70. A further 20% off that $70 saves $14, so the checkout price is $56. The combined reduction is 44%, not 50%.
Working backwards from $79 to $59
The saving is $20. Divide $20 by the $79 original price to find a discount of approximately 25.32%. This backwards calculation is explained here; the form above applies a percentage you enter to an original price.
What the result does and does not tell you
The sale price and dollar saving are deterministic results for the two numbers entered; they are not a forecast or a range. They do not establish that a deal is good value, that an advertised reference price is accurate, or that a business can afford the promotion.
If you are pricing products, compare the reduced selling price with costs using the Profit Margin Calculator before publishing a promotion. If you are shopping, compare like-for-like pack sizes and include any delivery charge when evaluating the total cost.
Discount mistakes to avoid
- Adding successive percentages: 30% off followed by 20% off means 44% off overall.
- Entering 0.20 when the discount field asks for 20.
- Comparing a sale price without delivery or a required minimum spend.
- Assuming the original reference price proves the item is good value.
- For a business promotion, treating the customer’s saving as the business’s remaining margin.
What this discount calculation covers
The form accepts an original price and one discount percentage. It returns the saving and reduced price for those inputs. It has no sale-price input or reverse mode.
Delivery, coupon eligibility, loyalty credits, multi-buy conditions and checkout rounding are separate checks. The worked section explains how to calculate percentage off from two known prices manually.
Supporting guides for this calculator
Use these related guides and comparison pages to interpret Discount Calculator, check assumptions and move to the next useful calculator faster.
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Discount Calculator FAQs
What do I enter?
Enter the original price and the percentage discount. For 20% off, enter 20 in the discount field.
What formula does it use?
Saving = original price × (discount percentage ÷ 100). Sale price = original price − saving.
Can I enter the original and sale prices to find percentage off?
The form has no reverse mode. Calculate (original price − sale price) ÷ original price × 100 manually, using an original price greater than zero.
How do I calculate two successive discounts?
Apply the first discount, then use its sale price as the starting price for the second. A 30% reduction followed by 20% off leaves 56% of the original price.
Does the result include delivery?
No. Add the applicable delivery and checkout charges separately when comparing the total purchase cost.
Does a discount tell me the remaining profit margin?
No. Use the reduced selling price and your direct costs in the Profit Margin Calculator to check that separately.
Compare the sale price with the pack size
A bigger discount does not always mean a lower cost for the amount you receive. After calculating the sale price, use the unit price calculator to compare the discounted pack per 100 g, 100 mL or item. The unit-price tool accepts kilogram and litre inputs and converts them to those fixed comparison units.
Checking the final price
Use the original price and percentage off to calculate the saving and sale price. Verify coupon conditions and delivery at checkout. For multiple reductions, apply each discount to the price remaining after the previous one.