Black Friday Discount Calculator
Enter the original price and the percentage off, add a coupon code on top, and see the price you actually pay and what the stacked discount really works out to.
How stacked discounts really work
The most common shopping mistake on Black Friday is adding percentages together. A 30 percent sale plus a 20 percent coupon is not 50 percent off. The coupon comes off the already reduced price, so you pay 70 percent of the original, then 80 percent of that, which is 56 percent of where you started: a true discount of 44 percent, not 50. On a $200 item that gap is $12.
The calculator does this properly. Enter the original price and the advertised percentage off, then add the coupon in the second box, and it shows the sale price, the final price, the amount saved and the true combined discount. Change the currency to pounds or euros and everything is reformatted instantly.
Judging whether a deal is actually a deal
- Check the reference price. Retailers often discount from a list price nobody has paid in months. What matters is the difference from the price you would otherwise pay this week.
- Track it before the sale. Note prices in early November. Price tracking extensions and browser history are both useful here, and a few minutes of checking beats a guess.
- Watch for thresholds. Spend more to save more offers often push you past what you meant to spend. Work out the final cost per item, not the headline saving.
- Include delivery. A 40 percent discount with $15 shipping can easily be worse than 30 percent delivered free.
- Check the returns window. Some retailers shorten it during sales, and gifts bought in November may fall outside it by the time they are opened.
When are Black Friday and Cyber Monday?
Black Friday is always the day after Thanksgiving in the United States, which is the fourth Thursday of November, so the date moves every year and can fall anywhere between November 23 and November 29. Cyber Monday is the Monday that follows. The Thanksgiving countdown calculates both dates for you automatically.
Although it started in the United States, Black Friday is now a fixture in the United Kingdom, Canada, Australia and across Europe, where it is mostly an online event rather than a doorbuster one. In practice the sales now stretch across the whole week, and many of the best prices appear either early in the week or late on Cyber Monday when retailers clear remaining stock.
Once you know what you are spending, the Christmas gift budget calculator keeps the running total under control across your whole list.
Frequently asked questions
How do I calculate a discount price?
Multiply the original price by one minus the discount as a decimal. A 30 percent discount on $80 is 80 x 0.70 = $56. The calculator above does this for you and adds a second, stacked coupon if you have one.
Does 30% off plus 20% off equal 50% off?
No. The second discount applies to the already reduced price, so you pay 0.70 x 0.80 = 56 percent of the original, which is a true discount of 44 percent rather than 50 percent.
When is Black Friday?
The day after Thanksgiving in the United States, which is the fourth Thursday of November. The date moves each year and falls between November 23 and November 29. Cyber Monday is the Monday that follows.
Does the calculator include sales tax or VAT?
No. It works on the pre-tax price you are shown, because tax rules differ by country and by state. Add tax and delivery separately when comparing the real cost at checkout.
Can I use this calculator for other sales?
Yes. It works for any percentage discount, including Cyber Monday, the January sales, end of season clearances and everyday coupon codes.