Ad ROI Calculator
ROAS, CAC, contribution margin and break-even — without spreadsheets.
Ad ROI
ROAS, CAC, margin and break-even of your ad campaigns.
What you spent on Meta, Google or TikTok Ads.
Gross revenue attributed to the campaign.
Your margin on the product. Physical 20–50%, digital 70–90%.
Return on investment
2.50×ROAS
ROI
+150%
Contribution margin
$0.00
real profit
CPA
$17
max $17
You're near break-even. Minimum ROAS required to not lose: 2.50×.
CTR
2%
click-through
CVR
1.2%
conversion
CPM
$4.00
per mille
CPC
$0.20
per click
Gross profit
$1,000
40% margin
Net (pre-margin)
$1,500
before margin
Assumptions
- • Margin applied: 40%
- • Break-even ROAS: 2.50×
- • Break-even CPA: $17
- • Contribution margin is the real money left after covering product + ads.
Metrics based on reported attribution. Doesn't include LTV, assisted organic traffic or operating costs.
What each metric means
ROAS = revenue / ad spend. Revenue per dollar spent.
ROI = (revenue − spend) / spend. Profit relative to spend.
CPA = spend / conversions. Cost of each sale.
Contribution margin = revenue × margen − spend. The real money left.
Break-even ROAS = 1 / margen. Minimum ROAS to not lose.
FAQ
- What ROAS is good?
- Depends on margin. With 40% margin, break-even is 2.5×. For real profit aim for 3×+ on prospecting and 5×+ on retargeting.
- ROI vs ROAS — which matters?
- ROAS is the honest ad metric (revenue/spend). ROI is net ((revenue-spend)/spend). We show both + real contribution margin.
- What gross margin should I use?
- Physical ecomm: 20–50%. Dropshipping: 15–30%. SaaS / digital: 70–90%. Services: 40–70%. When in doubt, 40% is a safe default.
- Why is my CPA high?
- Weak creatives, broad audiences or poor landing. Compare against break-even CPA (AOV × margin). If actual CPA > break-even, every sale loses money.