Please provide two values below to calculate.
| Original price | $279.00 |
| 1st percent off | 20.00% |
| Final price | $223.20 |
| You saved | $55.80 |
A percent-off sale lowers the price by a share of the original price. "20% off" means you save 20 out of every 100 dollars of the tag price and pay the other 80. The two key formulas are Saved = Original × Percent ÷ 100 and Final price = Original × (1 − Percent ÷ 100).
Worked example: an item costs $279 with 20% off. Saved = 279 × 0.20 = $55.80. Final price = 279 − 55.80 = $223.20.
A stackable discount is a second percentage taken off the already-reduced price, for example a store sale plus a coupon. Continuing the example, a further 15% off $223.20 saves another $33.48, so the final price is $189.72 and the total saving is $89.28.
The total discount is 32%, not 35%, because the second 15% is taken from a smaller number. In one step: Final price = Original × (1 − first%) × (1 − second%) = 279 × 0.80 × 0.85 = $189.72. Choose "Yes" for the stackable option to include this second discount.
Enter any two of original price, percent off, final price and amount saved. From the final price and percent: Original = Final ÷ (1 − Percent ÷ 100). From the two prices: Percent = (1 − Final ÷ Original) × 100. From the saving and percent: Original = Saved ÷ (Percent ÷ 100).
10% off is easy: move the decimal point one place left. 20% is twice that, 5% is half of it, and 25% is a quarter of the price. For 30% off, find 10% and multiply by three. These shortcuts let you check a till receipt in seconds.
Are two 50% discounts the same as free? No. Half of half is a quarter, so you still pay 25% of the price.
Does the order of stacked percentages matter? No. 20% then 15% gives exactly the same final price as 15% then 20%.
Why does my receipt differ slightly? Shops round each step to the cent, and tax is usually added after the discount.