About this calculator
ROAS (Return on Ad Spend) is revenue generated divided by ad spend — a multiple, not a percentage. A 4× ROAS means $4 of revenue per $1 of spend. It’s the standard metric for paid acquisition channels (Meta, Google, TikTok), but on its own it’s misleading because it ignores gross margin.
Why ROAS isn’t profit
If you have 30% gross margin and 3× ROAS, you make $3 in revenue per $1 spent — but only $0.90 in gross profit, which is a loss of $0.10 after the $1 of ad spend. Break-even ROAS = 1 / gross margin%. At 30% margin: 3.33× ROAS to break even. At 70% margin (SaaS): 1.43× ROAS to break even.
Contribution ROI vs ROAS
Contribution ROI = (gross profit − ad spend) / ad spend × 100. This is the true return-on-investment number. Marketing teams obsess over ROAS because it’s their direct attribution; finance teams care about contribution ROI because it’s what hits the P&L.
What ROAS misses about subscription businesses
Day-one ROAS is misleading for subscription products — a $30 first-payment looks like 1× ROAS on $30 ad spend, but if the customer stays 24 months, true ROAS over their lifetime is 24×. This is why subscription marketers use LTV/CAC instead of ROAS for paid acquisition decisions.
Improving ROAS
- Better targeting — lookalike audiences from your best customers, broad-then-narrow scaling.
- Higher creative output — successful brands run 50–100+ creative variations to find winners.
- Funnel improvements — better landing pages convert more clicks to revenue, raising ROAS without changing spend.
- Higher AOV — bundle, upsell, raise prices. A 25% AOV increase raises ROAS 25% with no other changes.