How the calculator works
Every order has a fixed amount of room for advertising. Take the sell price, subtract product cost, shipping, and platform fees, and what's left is your contribution — the absolute maximum you can spend to win that sale before you start losing money.
Your break-even ROAS is just the sell price divided by that contribution. It answers one question: how many dollars of revenue does each ad dollar need to bring back before this order stops costing you money?
Here's the math, line by line, for the numbers you entered above:
| Revenue (sell price) | $36.00 |
| − Product cost | −$12.00 |
| − Shipping | −$5.00 |
| − Platform & transaction fees | −$1.80 |
| = Contribution before ads(47.8% of revenue · break-even ROAS 2.09×) | $17.20 |
| − Ad spend(at 3×) | −$12.00 |
| = Net profit / order(14.4% margin) | $5.20 |
What drives your break-even ROAS?
Your break-even ROAS is just the inverse of your contribution margin — so anything that thins the gap between cost and price pushes it up. The wider that gap, the lower the ROAS your ads have to hit. Each lever is color-coded, and you'll spot the same colors in the “where each sale goes” bar in your results above and in the key-term formulas further down — so you can follow a single cost everywhere it shows up.
The bigger your COGS, the thinner the contribution — and the higher your break-even ROAS.
Slow, expensive shipping raises cost and refunds, lifting the ROAS you need.
Platform + payment fees skim a % off every order before ads even start.
Higher perceived value widens contribution, so a lower ROAS still profits.
Every refund is an order you paid to acquire and lost — raising your real break-even.
What's a healthy ROAS?
Because most dropshipping stores net 15–30% margins, sellers typically need a 3–4× ROAS to profit after every cost. But that's a symptom, not a rule — the thinner your margin, the higher the ROAS you need just to stand still.
How to lower your break-even ROAS
- Raise perceived value, not just price. Better photos, bundles, and positioning widen contribution so a lower ROAS still profits.
- Lower your COGS with better suppliers. A cheaper, reliable source drops the biggest cost on every order.
- Ship faster and closer. Domestic fulfillment cuts shipping time and the refunds that quietly raise your real break-even.
- Lift average order value. Bundles and upsells spread one ad cost across more revenue, improving effective ROAS.
- Pick higher-margin categories. Beauty, eco, and accessories carry more contribution than commoditized goods.
Know the numbers behind your ROAS
Every term comes with its formula — and the chip colors match the levers above.
How Doba protects your ROAS
Every number above traces back to one decision: where you source. The wider your contribution margin, the lower the ROAS your ads have to hit — and that gap is set at sourcing, not in the ad account. Doba is an AI-powered, US-first dropshipping platform built so those numbers land in your favor — over 1 million products from vetted, US-warehoused suppliers, not marketplace guesswork.
- 1M+ products to start from. Vetted suppliers, so you're picking from a real catalog on day one.
- 90%+ US-warehoused. Fast 2–7 day domestic shipping means fewer late-delivery refunds.
- No transaction fees. On any plan — the margin you calculate is the margin you keep.
- Trusted since 2002. 3.2M+ sellers have built on Doba.
A lower break-even starts before the ad does
You can't lower your break-even ROAS inside an ad account — it's set by what the product costs and what it sells for. These four AI tools work on that half.
AI Store Builder
Get ready-to-sell in minutes.
Try it now →AI Pickr
Smarter sourcing, bigger profits.
Start sourcing →AI Listing Optimizer
Smart titles & descriptions, written by AI.
Refine listings →AI Image Studio
From compliant to scroll-stopping — in one tool.
Open the studio →From single tools to Conversational AI Agent.
Doba Pilot turns your request into action — guiding product discovery, store setup, listing and fulfillment through one conversational AI workflow.
More free tools
Browse all free tools →Frequently asked questions
What is break-even ROAS?
Break-even ROAS is the return on ad spend at which an order makes exactly $0 profit — every dollar of revenue is consumed by product cost, shipping, fees, and the ad that won the sale. Run ads above your break-even ROAS and you profit; below it and you lose money on each order.
How do you calculate break-even ROAS?
Break-even ROAS = sell price ÷ contribution before ads, where contribution = sell price − product cost − shipping − platform/transaction fees. For example, a $36 product with $18.20 of cost, shipping, and fees has $17.80 of contribution, so its break-even ROAS is about 2.02×. This calculator does the math automatically as you type.
What is a good ROAS for dropshipping?
There’s no universal number — a good ROAS is comfortably above your break-even ROAS. Because most dropshipping stores net 15–30% margins, sellers typically need a 3–4× ROAS to profit after every cost. The thinner your margin, the higher the ROAS you need just to break even.
What’s the difference between ROAS and ACoS?
They’re inverses of the same number. ROAS (return on ad spend) is revenue ÷ ad spend, expressed as a multiple like 3×. ACoS (advertising cost of sale) is ad spend ÷ revenue, expressed as a percentage. A 4× ROAS is the same as a 25% ACoS. Break-even ACoS equals your contribution margin.
How do I lower my break-even ROAS?
Widen the gap between what a product costs and what it sells for: raise perceived value so you can charge more, lower product cost with better suppliers, and cut shipping and refunds with fast domestic fulfillment. A bigger contribution margin means a lower break-even ROAS — so your ads have more room to work.
What ROAS do I need to hit a 20% profit margin?
Enter your costs and a 20% target margin and the calculator returns the exact ROAS required. As a rule, the higher your margin goal, the higher the ROAS you need — and a target above your contribution margin isn’t reachable at any ad spend, which is the signal to fix your unit economics first.
Is a 3x ROAS good for dropshipping?
It depends entirely on your margin. A 3× ROAS is profitable if your break-even ROAS is below 3× — but if your costs push break-even to 3.5×, that same 3× loses money. Always read ROAS against your own break-even, not a generic benchmark.
How do I find high-margin products to dropship?
Start with sourcing rather than guesswork. Doba’s AI Pickr analyzes market trends and demand signals to surface in-demand products in your niche, and Doba Pilot can run the whole workflow — sourcing, store setup, and listings — from a single request. Both draw on vetted, US-warehoused suppliers with fast 2–7 day domestic shipping that protect your margin.
