What is a ROAS calculator and how to use it
A ROAS calculator computes return on ad spend by dividing revenue by ad spend. ROAS of 3.0 means you generated $3 in revenue for every $1 spent on ads. The return on ad spend calculator also calculates profit per unit and profit margin, so you see real dollars not just ratios. Since ROAS alone does not tell you whether you are making money (a $100 product at 3x ROAS might be highly profitable; a $5 product at 4x ROAS might lose money per unit), a good ad spend ROI calculator breaks down profit after cost of goods, payment processing and ad spend.
Performance marketers and ecommerce teams use a ROAS calculator daily. The profit margin calculator for ads helps you compare campaigns fairly: one campaign might be 2.5x ROAS and one might be 3.5x, but the first is actually more profitable because the product cost is lower. An advertising efficiency calculator lets you see which channel or campaign is truly the best performer in dollars, not just ratios.
ROAS = Revenue / Ad Spend
Profit = (Revenue x Margin%) - Ad Spend
ROI = (Profit / Ad Spend) x 100%
Cost Per Order = Ad Spend / Number of Orders
ROAS is revenue divided by what you spent to make it. Profit is what's left after the margin on that revenue minus the ad spend. Cost per order tells you the ad cost side of unit economics.
A worked example
$25,000 revenue, $10,000 spend, 50% margin:
- ROAS = 25,000 / 10,000 = 2.5x
- Profit = (25,000 x 0.50) - 10,000 = $12,500 - $10,000 = $2,500
- ROI = (2,500 / 10,000) x 100 = 25%
- If 100 orders: cost per order = 10,000 / 100 = $100
A 2.5x ROAS on a 50% margin business means you made $2,500 on $10,000 spent. Scale works when the next $10,000 brings the same $2,500 profit. Stop when marginal ROAS falls below break-even.
ROAS is not the only metric
ROAS tells you if the campaign is profitable. Three habits make it actionable:
- Watch marginal ROAS, not average. The first $1,000 of spend might be 4x, the next $5,000 might be 1.5x, and the last $10,000 might be 0.8x. The average stays fine long after you should have stopped spending.
- ROAS is margin-dependent. A 2.5x ROAS on a 60% margin is a win. The same 2.5x on a 20% margin is a loss. Always compute both metrics.
- Set the bid target below break-even times 1.3. Most teams guess. A campaign with a 2x break-even ROAS should target 2.6x to 3x to leave room for variation. Use this calculator to find your break-even first.
When to scale and when to cut
Scale when:
- ROAS is at least 1.5x your break-even ROAS (usually 2x or higher).
- Marginal ROAS on the most recent spend sits above break-even.
- You have tested the next tier of budget and it holds.
Cut when:
- Average ROAS falls below break-even.
- Marginal ROAS on new spend has slipped below break-even on two consecutive days or days.
- The audience is exhausted and new segments do not respond.
How to use this ROAS calculator
- Enter Total revenue.
- Enter Ad spend.
- Enter Profit margin: Contribution margin: revenue minus cost of goods, fees and other variable costs.
- Enter Number of orders: If known.
- Read ROAS, which updates as you type: Revenue divided by ad spend.
- Check the supporting figures: Profit (at margin %), ROI, Cost per order.
- Read the verdict under the result. It says what the number means for you and what to change first.
- Use Copy results to paste the figures anywhere, Copy link to this result to share the exact scenario, or Embed on your site to put the calculator on your own page.
Questions people ask
What is a good ROAS?
One that exceeds your break-even ROAS by a safe margin. There is no universal number. A 4x ROAS is a loss at a 20% margin and excellent at a 60% margin. Compute your break-even using the break-even ROAS calculator first.
Should I include shipping in revenue or as a cost?
If customers pay for it, it is part of revenue. If you absorb the cost, count it as a cost. Either way, your margin should reflect the actual customer money.
What if I do not know my exact margin?
Start with cost of goods divided by price, then add 5% for fees and other variable costs. For services, use the billable rate minus the direct cost (labour, materials) divided by the rate.
Does ROAS include fixed costs?
No. ROAS is a per-order metric: does this campaign's revenue cover its variable costs plus the ad spend? Fixed costs (salaries, rent, software) belong in a P and L, not in ROAS.
How do I know when to stop scaling?
Stop when the marginal return on the last tranche of spend falls below your break-even ROAS. At that point each new dollar is a loss. You can continue with an existing budget if it is profitable, but new spend is no longer justified.
Is 3x ROAS good?
It depends. Three times return means you generated $3 for every $1 spent. With a 40% margin, 3x ROAS returns $1.20 of margin per dollar of ad spend, so 20 cents of profit after the ad is paid for; the calculator shows the same arithmetic for your own margin. Compare to your target profit margin and your other channels.
What is the difference between ROAS and ROI?
ROAS is revenue divided by ad spend. ROI (return on investment) includes all costs: COGS, payment fees, shipping and overhead. This ROAS calculator shows both. Use ROI to decide whether a campaign is profitable. Use ROAS to compare campaign efficiency across channels.
Last reviewed 23 September 2026. Formulas and benchmarks are published on the page so you can check them. This tool gives estimates, not quotes.
