Dropshipping looks like pure margin: sell at $49 what costs you $22 and keep $27. In practice, payment processing, returns, chargebacks and advertising consume most of that gap, and a store can be busy all month and still lose money. This guide builds the full calculation and introduces break-even ROAS, the number that decides whether your ads are viable.
The real per-order cost stack
Take a product sold at $49.00 with a supplier cost of $22.00:
| Line item | Amount | Basis |
|---|---|---|
| Revenue | $49.00 | — |
| Supplier cost | −$22.00 | Includes item price |
| Supplier shipping (often separate) | −$5.00 | ePacket / standard |
| Payment processing (2.9% + $0.30) | −$1.72 | On gross revenue |
| Platform / app fees | −$0.50 | Amortised per order |
| Returns (at ~8% of orders) | −$2.16 | Blended across orders |
| Chargebacks & fraud (~1%) | −$0.49 | Blended, plus fee per case |
| Contribution before ads | $17.13 | 35% of revenue |
| Advertising at $20 per order | −$20.00 | Typical early-stage CPA |
| Net per order | −$2.87 | Loss |
This is the most common failure pattern: a product that looks like a 55% markup and a healthy 35% contribution loses money at a $20 cost per acquisition. The margin was fine; the ad cost was not.
Check your own numbers with the Dropshipping Profit Calculator, and compare channels with the Reselling Profit Calculator.
Break-even ROAS
ROAS (return on ad spend) is revenue divided by ad spend. The break-even ROAS is simply 1 ÷ contribution margin:
With a 35% contribution margin: 1 ÷ 0.35 = 2.86. So you need $2.86 of revenue per $1 of ad spend just to break even on this order. Anything above 2.86 is profit; anything below is loss.
Translating to CPA: with a $49 average order value, break-even ROAS of 2.86 means a maximum CPA of $49 ÷ 2.86 = $17.13 — exactly the contribution figure. That is the sanity check to run before scaling any campaign. Many new stores bid toward a $20–$30 CPA on a product whose ceiling is $17, which loses money in proportion to how well the campaign performs.
Why returns dominate in dropshipping
Return rates in dropshipping run higher than in traditional retail, often 8–15%, because the customer cannot see the product before buying, shipping times are long, and sizing expectations are unreliable. Each return costs more than the refund: you may pay return shipping, the original shipping is sunk, and the item may not be resellable.
The effect is larger than the line item suggests, because a return removes revenue while several costs are already spent. Model returns as a blended cost across all orders rather than a per-incident annoyance — an 8% return rate on a $49 order with $27 of sunk cost removes about $2.16 from every sale.
Why AOV and conversion rate beat margin
There is a tempting instinct to raise prices when margins look thin, but in paid-traffic businesses the two levers that usually matter more are average order value and conversion rate, because both attack the advertising cost rather than the product cost.
Consider a store with a 2% conversion rate, a $49 AOV and a $20 CPA. Every 100 clicks cost $20 and generate two orders worth $98 — so $98 of revenue for $20 of ads, a ROAS of 4.9. Now suppose a bundle lifts AOV to $65 with no change in conversion or ad spend: the same 100 clicks still cost $20 but generate $130, a ROAS of 6.5. The product margin did not change at all; the revenue per click did.
Conversion rate works the same way from the other direction. Lifting conversion from 2% to 3% on identical traffic produces three orders from the same $20, dropping effective CPA from $20 to $13.33 — which can move a losing campaign into profit without touching price, supplier cost or shipping.
Price increases, by contrast, tend to reduce conversion rate. A 10% price rise that halves conversion usually destroys more profit than it creates. That does not make price rises wrong — it makes them a decision that should be tested against conversion, not assumed.
Levers that actually move the number
- Raise AOV. Bundles and order bumps spread the fixed ad cost across more revenue, which improves ROAS without touching the product.
- Negotiate landed cost. Cutting $2 from supplier plus shipping adds $2 straight to contribution — the same effect as a $5.70 revenue increase at 35% margin.
- Cut return rate. Better sizing charts, accurate photography and honest shipping estimates can move returns by several points, worth more than most price changes.
- Improve conversion rate. A better product page lowers CPA directly, which is often the single biggest lever available.
Key Takeaways
Dropshipping profit is revenue minus supplier cost, shipping, payment fees, blended returns and chargebacks, then advertising — and the advertising line usually decides the outcome. Compute break-even ROAS as 1 ÷ contribution margin (35% margin = 2.86 ROAS) and never bid above the CPA it implies. Returns should be modelled as a blended per-order cost, not an occasional event.