Return on Ad Spend (ROAS)
The revenue generated for every dollar spent on advertising, calculated by dividing revenue attributed to ads by total ad spend.
ROAS Is the Wrong Metric for Most B2B SaaS Companies
Controversial take: ROAS works for e-commerce where someone clicks an ad and buys within 24 hours. For B2B SaaS with 60-180 day sales cycles, ROAS measured in real time is almost always wrong. The ad spend happened months before the revenue. Attributing revenue to the right ad requires a multi-touch model and a CRM that actually tracks the full journey.
That said, ROAS still matters — you just need to measure it correctly. Use cohorted ROAS: take all the ad spend from Q1, then measure the revenue from those leads over 6-12 months. That gives you the true return, not the vanity number your ad platform reports.
How to Calculate ROAS
ROAS = Revenue Attributed to Ads / Total Ad Spend
If you spent $30K on Google Ads in Q1 and the leads from those campaigns generated $150K in closed-won revenue, your ROAS is 5:1. Simple math, complicated attribution.
| ROAS | What It Means | Action |
|---|---|---|
| Below 2:1 | Losing money after costs | Pause or restructure |
| 2:1 - 4:1 | Breaking even to modest return | Optimize conversion rates |
| 4:1 - 8:1 | Healthy return | Maintain and scale carefully |
| 8:1+ | Excellent or under-investing | Scale spend, test new channels |
Why SaaS Teams Get ROAS Wrong
Three common mistakes. First, using platform-reported ROAS (Google and Meta over-attribute by 20-50%). Second, measuring ROAS on a monthly basis when your sales cycle is quarterly. Third, ignoring expansion revenue — a customer acquired through ads who starts at $10K ACV and expands to $50K over three years has a completely different ROAS than the first-year number suggests. Build your ROAS model on LTV, not just initial contract value.
Frequently Asked Questions
What is a good ROAS for B2B SaaS?
For B2B SaaS, ROAS is tricky because of long sales cycles. Measuring first-year ACV against ad spend, aim for 5:1 or higher. If you factor in LTV, a 3:1 ROAS can be acceptable for enterprise deals. The problem is attribution lag — a click in January might not close until June, making real-time ROAS unreliable.
How is ROAS different from ROI?
ROAS measures revenue per dollar of ad spend only. ROI measures profit after all costs including salaries, tools, creative production, and overhead. A campaign with 4:1 ROAS might have negative ROI if the fully loaded costs exceed the revenue. ROAS is a marketing metric. ROI is a business metric.
