Why headline ROAS is misleading
A 4x ROAS sounds great until you remember margin. A 50%-margin business needs a 2x ROAS just to break even on COGS — before salaries, software, or shipping. This calculator surfaces break-even ROAS so you target the right number.
- • Break-even ROAS = 1 ÷ gross margin.
- • CPA is more useful than ROAS for lead gen.
- • Pair with LTV : CAC for any subscription business.
Where to find leverage
Conversion rate has the highest impact on ROAS — doubling CR doubles revenue at the same spend. CPC reductions are second; AOV increases are third. Spend hikes without those levers usually compound losses.
ROAS is the wrong metric to optimize against if you don't know your gross margin. A 4x ROAS sounds great until you realize your COGS is 60% — you're losing money. This calculator works in margin-adjusted terms so you optimize against actual profit.
What each input means
Get these inputs right and the output is reliable. Get them wrong and the calculator just multiplies bad assumptions.
Ad spend
What you'll spend in Google Ads in the period.
Typical range: $1k–10k/mo small business; $20k–100k mid-market; $100k+ scaled DTC.
Average order value (AOV)
Gross revenue ÷ orders.
Typical range: $40–150 for most DTC; $200–500 for high-AOV verticals.
Conversion rate
Orders ÷ ad clicks. Distinct from on-site conversion rate.
Typical range: 1.5–4% on Google Search; 0.8–2% on Display/PMax.
Cost per click (CPC)
Average paid CPC.
Typical range: $0.80–3 for most B2C; $5–20 for B2B/high-intent commercial keywords.
Gross margin %
What's left after COGS and direct sale costs.
Typical range: 60–80% for DTC; 40–60% for marketplace/distributor models.
Worked examples
Real scenarios with the math walked through line by line.
DTC home goods, $80 AOV
Scenario: $5k spend, $80 AOV, 2.5% conversion, $1.50 CPC, 65% margin.
Math: Clicks = 3,333. Orders = 83. Revenue = $6,640. ROAS = 1.33x. Gross profit = $4,316. Profit-on-ad = -$684.
Outcome: Losing $684 net. Need 1.55x ROAS minimum to break even. Push conversion to 3.2% or AOV to $100.
B2B SaaS, $300 trial-to-paid
Scenario: $10k spend, $300 first-month value, 12% conversion, $8 CPC, 80% margin.
Math: Clicks = 1,250. Trials = 150. Revenue = $45k. ROAS = 4.5x. Gross profit = $36k. Profit = $26k.
Outcome: Strong. But model LTV — true ROAS over 12 months is likely 12x+.
Common mistakes
Where this calculation usually goes wrong in the real world.
- Optimizing ROAS without margin. 4x ROAS at 25% margin = break-even.
- Using gross revenue ROAS for retargeting and acquisition together. Retargeting always inflates ROAS attribution.
- Setting Smart Bidding ROAS targets based on industry averages instead of your actual break-even.
- Excluding sales/CS overhead from margin. True 'fully-loaded' margin is often 10–20pp lower than gross.
When to use this calculator
- Setting tROAS targets in Google Ads bidding strategies.
- Deciding to scale or pause a campaign.
- Pricing decisions — modeling the ad budget you can afford at each price point.
- Comparing channel profitability (Google vs Meta vs TikTok).
Glossary
ROAS
Return on Ad Spend. Revenue ÷ ad spend. Usually expressed as a ratio (e.g. 4:1 or '4x').
tROAS
Target ROAS — the minimum you tell Google Ads' Smart Bidding to optimize for.
Break-even ROAS
1 ÷ gross margin. At 50% margin, break-even ROAS = 2x.
POAS
Profit on Ad Spend. (Revenue × margin − ad spend) ÷ ad spend. The metric that actually matters.
More questions answered
What's a good ROAS for Google Ads?
Depends entirely on your margin. Calculate break-even ROAS = 1 ÷ gross margin. Beyond break-even, target 1.5–2x break-even to cover overhead and grow. A '4x ROAS goal' across all businesses is meaningless.
Why is my Google Ads ROAS dropping?
Common causes: increased CPC competition, account-wide bid increases pushing into worse keywords, decline in landing page conversion rate, attribution model changes (post-iOS 14, GA4 migration), or Performance Max cannibalization of branded search.
Should I use ROAS or POAS?
POAS (Profit on Ad Spend) is strictly better for businesses with variable margins. ROAS works for SaaS/digital products where margin is uniform. Use POAS if you sell mixed-margin SKUs.
Related guides
Long-form playbooks on the same topic, written by the RevenueLab editorial team.
Methodology last reviewed: 2025-11 by the RevenueLab editorial team.
FAQ
What's a good Google Ads ROAS?
Target depends on margin. A 50%-margin business needs 2x just to break even; most operators want 3–5x. High-margin SaaS can run profitably at 2x because retention compounds.
Should I use ROAS or CPA?
Ecommerce usually prefers ROAS (revenue-driven), lead gen prefers CPA (volume-driven). Both reduce to the same math once you include conversion value.
Does this include LTV?
No — this is single-purchase ROAS. For subscriptions, multiply AOV by expected lifetime value before running the model.