Discount Profit Calculator

Sale price = Original price × (1 − Discount%). Profit at sale price = Sale price − Fees − Product cost − Shipping. A $30 item at 20% off sells for $24; if fees run $2.50 and product cost + shipping is $10, profit drops from roughly $13.50 at full price to about $11.50 at the discounted price — a smaller cut than the 20% price cut, because fixed costs don't discount.

Max discount = 1 − (Break-even price / Original price). If your break-even price (the price at which profit = 0) is $18 and your original price is $30, max discount = 1 − (18/30) = 40%. Anything beyond that turns the sale into a loss on that unit, regardless of volume gained.

Extra units needed compares total profit at full price against total profit at the discounted price, divided by profit-per-unit at the discount. A 20% discount that cuts profit-per-unit from $10 to $6 means you'd need roughly 67% more units sold just to match your original total profit — discounts often require far more volume lift than sellers assume to break even on total profit.

Discounting off the sale price without recalculating platform fees, which are usually charged as a percentage of whatever price the item actually sells at. A 20% off sale doesn't just cut $6 off a $30 item — it also lowers the platform fee slightly, but not enough to offset the lost revenue. The dollar-for-dollar hit to profit is almost always larger than sellers expect.

Discounts work when they're financed by genuinely higher volume (clearing inventory, winning a search-ranking boost from 'on sale' badges) or when marginal cost per unit is near zero (digital products). They work poorly on already-thin-margin physical goods, where even a 10% discount can erase most of the profit per unit.

Yes — select a platform preset to auto-fill typical fee rates, or enter your own. The discount math (sale price, fees on sale price, break-even, extra units) applies the same way regardless of platform; only the fee percentages differ.