Dropshipping ROAS Calculator
"Just get a 3x ROAS" is the most expensive advice in dropshipping, because the ROAS you need is a function of your margins, not an industry slogan. A 3x ROAS on a fat-margin product is wasteful (you could spend more to grow faster); a 3x ROAS on a thin-margin product is a death spiral. This calculator reverses the question: given your real product cost, shipping, and payment fees, what is your actual break-even ROAS, what is the maximum you can pay to acquire a customer, and what ROAS hits the net margin you actually want? Plug in your numbers and stop guessing.
Your Unit Economics
Break-Even ROAS Is Personal, Not a Slogan
ROAS compares ad-driven revenue to ad spend. But profitability is decided before the ad even runs, by your contribution margin — the money left after product cost, shipping, and payment processing. The relationship is exact:
Break-even ROAS = Price ÷ (Price − ProductCost − Shipping − PaymentFees)
Notice the break-even ROAS gets worse (higher, harder to hit) as your margin shrinks. A 70%-margin product breaks even around 1.4x; a 40%-margin product needs ~1.7x; a 25%-margin product needs 2.0x. This is why two stores with identical "2.5x ROAS" can be in completely opposite financial positions.
Max Affordable CAC: Your Real Bidding Ceiling
CAC (Customer Acquisition Cost) is simply ad spend per order. Your absolute ceiling is the contribution margin per order — spend more than that and you lose money before overhead. But most stores want a target margin, not break-even. The formula:
Max CAC (target margin m) = ContributionMargin − (Price × m)
With a $27.39 margin and a 15% target on a $45 AOV, your max CAC is about $20.62. This number should drive your bidding: if Facebook's auction costs more than $20.62 to land a conversion, you are buying unprofitable orders no matter how good the creative looks.
Why ROAS Falls When You "Win"
The most common panic in dropshipping is watching ROAS decay as spend scales. This is auction mechanics, not a broken store: at low budgets you reach your best-matched users cheaply; as you raise spend you exhaust that pool and pay more for lower-intent users, pushing CAC up and ROAS down. The counter-intuitive fix is rarely "spend less" — it is raise AOV (so break-even ROAS drops and you can outbid competitors) and refresh creative (to reopen cheap, high-intent inventory). Stores that understand this treat ROAS as a moving target tied to margin, not a fixed scoreboard.
Frequently Asked Questions
What ROAS do I need to break even?
Break-even ROAS = Price ÷ contribution margin per order. A $45 product with ~$27.39 margin breaks even at ~1.64x. Below that, every order loses money.
What is a good ROAS for dropshipping?
There is no universal good ROAS — it depends on margin. Sustainable stores usually run 2.0x–4.0x, but a high-margin store can profit at 1.7x while a thin-margin one needs 3x+. Use this calculator for your personal number.
How do I calculate max affordable CAC?
At break-even, max CAC = contribution margin per order. For a target margin m, max CAC = margin − (price × m). With a $27.39 margin and 15% target on $45 AOV, max CAC ≈ $20.62.
Why did my ROAS drop after scaling?
Audience saturation and auction pressure raise CAC as you push budget. Fix with fresh creative and higher AOV so your break-even ROAS is easier to beat — not by cutting spend alone.
Should I include repeat purchases in ROAS targets?
Yes, if you have meaningful repeat rate. LTV raises effective contribution per customer, lowers required break-even ROAS, and lets you bid more aggressively. One-and-done stores should plan on first-order economics.