What will your BFCM offer cost, and how many more orders does it need?
Pick the offer you're planning for Black Friday and Cyber Monday: a percent off, free shipping, a gift with purchase or a spend-and-save tier. Add your AOV and gross margin. It shows what the offer costs you per order and across the weekend, the lift in orders it needs to break even, what's left once you pay peak-season ad prices, and how a non-price incentive stacks up against it.
Every offer gives away part of the gross profit on each order. To come out even, you need enough extra orders to replace it: the order lift required is your gross profit per order divided by what's left after the offer, minus one. At an $80 AOV and 60% margin, 20% off needs 50% more orders just to stand still.
- Gross profit per order = AOV x gross margin. Cost of goods doesn't move when the price does, so the whole discount comes out of profit.
- Cost per order by offer: percent off = AOV x discount. Free shipping = the shipping you'd have charged x the share of orders that paid it. Gift with purchase = the gift's landed cost. Spend-and-save = the reward x the share of orders that qualify.
- Break-even order lift = gross profit per order / (gross profit per order - offer cost) - 1. If the offer costs as much as the order earns, no lift pays for it.
- Peak ad prices: subtract ad cost per order from both sides and run the same formula. The thinner the margin after ads, the steeper the lift.
- Store credit for the next order costs only the product cost of what gets redeemed: credit x redemption rate x (1 - gross margin).
- A spend-and-save tier pays for itself when a qualifying basket grows by the reward divided by your margin.
- Common mistake: judging the weekend on revenue. A sale can set a revenue record and still leave less gross profit than a normal week at full price.
How the offer cost and the break-even lift are calculated
Each order earns AOV times gross margin in gross profit. An offer takes a fixed amount out of that, and your cost of goods stays where it was. Percent off removes the discount share of the price. Free shipping costs the shipping you would have charged, but only on the orders that were paying it. A gift costs its landed cost. A spend-and-save tier costs the reward on the orders that reach the threshold. Whatever is left is what each order earns during the sale, and the order lift you need is the ratio of the two, minus one. Multiply the per-order cost by the orders you'd expect over the weekend and you get the gross profit the offer gives away if it brings in nothing extra.
My view: BFCM pairs the most expensive week of the year to acquire a customer with the biggest discount of the year, and the buyers it brings in are mostly shopping for the number. Ads cost the most that week. Lebesgue's 2025 Meta data put CPMs 59% above September in Black Friday week, though conversion rose enough that cost per purchase fell 20%. Then look at what the order turns into: across Ometria's retail clients, only 4% of Black Friday 2024 new customers bought again within a year. That's why the tool subtracts ad cost per order and runs the break-even again. Some brands still have to play, because their category trained shoppers to wait. For them the job is a small, structured offer, and a gift or credit toward the next order usually costs far less per order than a cut to the price.
Before you set the offer, see how deep other DTC brands are going in the BFCM Discount Tracker. If you'd rather not lead with price at all, the free-shipping threshold calculator finds a threshold that raises cart size, and the conversion vs margin calculator runs the same math on a permanent price change. Your inputs carry from tool to tool across the full set of free DTC calculators.