Google Ads ROI Calculator

ROAS is the headline number every PPC agency leads with: '4× return on spend!' But ROAS measures revenue against spend — it ignores the cost of actually delivering the product. A 400% ROAS at 25% margin means $4 of revenue per $1 of spend, but only $1 of gross profit per $1 of spend — break-even. At 40% margin the same 400% ROAS yields $1.60 of gross profit per $1 of spend, a respectable 60% gross ROI. The break-even ROAS — the threshold below which the campaign loses money — is exactly 100% ÷ Margin%. Memorize that. At 50% margin you need 200% ROAS to break even; at 25% margin you need 400%; at 10% margin (most retail) you need 1000% — usually unrealistic for paid search. Categories with thin margins fundamentally have less room to spend on customer acquisition through paid channels, which is why DTC brands selling commodity products tend to lose money on Google Ads despite hitting industry-standard ROAS benchmarks.

Every PPC campaign has three independent levers: CVR (what percentage of clicks convert), CPC (how much each click costs), and AOV (how much each conversion is worth). Improving any of the three by 20% improves profitability by roughly 20%; improving all three by 20% can quadruple profit because the effects compound through the funnel. The optimization order matters. CVR is usually the highest-ROI lever because landing-page and offer changes can move CVR by 50–100% over a few months, while CPC and AOV usually move by 10–30%. CPC is partially within your control via match-type discipline and negative keywords, but Google's auction sets the floor — you can't drop CPC below the second-price floor without ceding impression share. AOV scales through better cross-sells, free-shipping thresholds, and bundling, and these changes affect every campaign and every channel simultaneously, not just paid search. The right sequence for most companies: fix the landing page first (CVR), then layer on AOV expansion (cross-sell, bundle), then chip away at CPC through audience and keyword refinement.

The break-even-CVR, break-even-CPC, and break-even-AOV outputs reveal exactly how much slack each input has before the campaign goes underwater. A campaign at 3% CVR with break-even at 2.6% has only a 13% buffer — if CVR drops 0.4 percentage points (well within normal variance), the campaign loses money. A campaign at 3% CVR with break-even at 1.8% has a 67% buffer — substantial. Looking at your buffer on each axis tells you what to fortify. If CVR buffer is thin, the campaign is one bad landing-page change away from losing money; if AOV buffer is thin, a competitor's price cut could sink it. Most companies obsess over the headline ROAS or profit number and ignore the buffer — but buffer is what tells you how risky the campaign actually is, and what changes you can safely make before reviewing performance.