Discount Calculator
Find the sale price and how much you save on any discount.
How to use the Discount Calculator
- Enter the original price.
- Enter the discount percentage.
- See the final price and the amount you save.
Saving = Price × discount% · Final = Price − Saving
About the Discount Calculator
Enter an original price and a percentage off, and this returns the saving (price × percentage ÷ 100) and the final price you pay. Showing the saving as real money rather than a percentage is the point: 30% off sounds identical on a $12 item and a $1,200 item, and it very much is not. The discount field is capped at 100%.
The most useful thing to know about discounts is that they do not add up. "20% off, then an extra 10% off at the till" is not 30% off — it is 28%. The second discount applies to the already-reduced price, so the two multiply rather than sum: 0.80 × 0.90 = 0.72, leaving 72% of the original. Shoppers routinely overestimate what they are saving, and the gap widens as the discounts grow: 50% then 50% is not free, it is 75% off.
This handles one discount at a time, so to stack them run it twice — take the final price from the first pass and put it back in as the original price. The order does not matter to the result. It also has no idea whether the "was" price was ever genuinely charged, worth remembering when a sale sign looks too good. For tax on the discounted price see the VAT calculator, and for the underlying maths the percentage calculator.
Frequently asked questions
Is 20% off plus another 10% off the same as 30% off?
No, and this is the most common discount mistake. It comes to 28% off, because the 10% is taken from the already-reduced price, not the original. Multiply what remains: 0.80 × 0.90 = 0.72, so you pay 72% of the original price.
Can I stack two discounts in this calculator?
Not in one pass — it applies a single discount. Run it twice: take the final price from the first calculation and enter it as the original price for the second. That reproduces exactly how the till applies them.
Does the order of two discounts matter?
Not to the final price — multiplication commutes, so 20% then 10% gives the same result as 10% then 20%. It can matter in the real world if a voucher's terms specify what it applies to, or if a minimum-spend threshold is checked before the other discount.
How do I work out what percentage off something is?
Divide the saving by the original price and multiply by 100. If a $80 item is now $60, the saving is $20, and 20 ÷ 80 × 100 = 25% off. The percentage-change calculator does this directly.
Does the final price include tax?
No. The calculator only takes a price and a percentage — it has no tax awareness. Whether tax is already in the price you entered depends on where you are shopping.
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