How to calculate selling price from cost, margin, and fees

The selling price formula depends on the target. For margin, divide total unit cost by 1 minus target margin. For markup, multiply total unit cost by 1 plus markup. If a percentage fee comes out of the sale, subtract that fee rate in the margin formula too.

Formula and example math on this page were checked on July 3, 2026. The formulas are not platform rates. They are pricing math, so they only change if your cost, fee assumption, or target profit changes.

A $40 cost needs a $66.67 selling price to keep a 40% margin before fees. A $40 cost with a 40% markup sells for $56 and keeps a 28.6% margin before fees.

Use margin for the final price. Markup is fine for a quick quote, but margin is better for real selling because it tells you how much of the sale is left after cost. That is the number that has to pay for fees, discounts, ads, and owner pay.

The common mistake is adding 40% to cost and thinking the product has a 40% profit margin. It does not. Adding 40% creates a 40% markup, which is only a 28.6% margin before fees.

Use markup only when the decision is cost-based, like quoting a wholesale job from a known cost sheet. Use margin when the product has to survive the real store.

To calculate selling price per unit, add every batch cost, divide by the number of sellable units, then use that unit cost in the margin formula. Count sellable units, not produced units, because damaged units still cost money even if they cannot be sold.

If a batch costs $900 and only 110 units can be sold, the unit cost is $8.18, not $7.50. Pricing from the 120 units produced would hide $0.68 of cost inside every sale.

The tighter the product margin, the more this matters. A small unit-cost error can erase the profit on low-priced items.

Fees change the formula because many fees are taken from the selling price, not from cost. If your product costs $35, your target margin is 35%, and your percentage fee assumption is 5%, the price is $35 divided by 0.60, or $58.33.

Do not add percentage fees after the price is set if you need an exact margin. Put the fee rate in the denominator. Fixed fees work differently, so add them to the cost side before dividing.

A $35 unit cost with a 35% target margin and a 5% percentage fee needs a $58.33 selling price. That price leaves $20.42 profit after the $2.92 fee.

If competitors sell for less than your profit-safe price, do not copy them blindly. First check whether they have lower costs, higher volume, cheaper shipping, a different product, or weaker margins. Your price floor is the lowest price that still covers cost, fees, and required profit.

The right move is not always to lower price. Sometimes the better move is to reduce cost, sell a bundle, change the offer, or stop selling that item. A product that only works at someone else's cost structure is not a product you can scale.

Use competitor prices as a market check, not as the formula. The formula tells you what the product must earn. The market tells you whether the offer deserves that price.

Discounts and free shipping should be priced before launch, not after the product is live. A 15% coupon reduces revenue immediately. Free shipping is not free for the seller, so it belongs in unit cost if you pay for the label.

If a $70 product has a 15% coupon, the customer pays $59.50 before tax. If the product was priced to barely hit margin at $70, that coupon can turn a good-looking order into a weak one.

The clean workflow is simple. Price the product at the normal price, test the discounted price, then test the shipping scenario. If all three work, the product is much safer to publish.