ROAS (Return On Ad Spend) is the ratio of revenue generated to ad spend. It is the primary performance metric showing how efficiently ads produce revenue, usually expressed as a percentage (%). In performance marketing, it serves as the baseline for budget allocation and channel evaluation.
Formula and Interpretation
ROAS = (Revenue from ads ÷ Ad spend) × 100
Spend 1 million KRW and generate 5 million KRW in revenue, and your ROAS is 500%. The higher the number, the better the ad efficiency.
- Break-even ROAS: Calculated as the inverse of your margin rate. At a 25% margin, the BEP is 400%
- Target ROAS: Set above break-even by adding margin and fixed costs
- If ROAS falls below BEP, you lose money on every sale
Difference from ROI
ROAS is based on 'revenue', while ROI is based on 'profit'. Even with high revenue, thin margins can make ROAS look strong while you are actually running a loss.
| Metric | Basis | Limitation |
|---|---|---|
| ROAS | Ad revenue | Excludes margin and cost |
| ROI | Net profit | Complex to calculate |
For an accurate read, review CPC, conversion rate, and CAC together.
How to Improve ROAS
ROAS is not determined by media bidding alone. The post-click experience drives revenue.
- Improve your landing page: Higher conversion rates mean more revenue from the same ad spend
- Match search intent: Use creative aligned with search intent to raise CTR
- Grow organic traffic: Use SEO to increase free traffic and reduce reliance on paid channels
Note
ROAS is a short-term ad efficiency metric. For repeat-purchase or subscription businesses, supplement it with an LTV perspective. 238lab designs paid ad efficiency together with organic traffic from SEO and GEO to drive long-term ROI.