SEO vs Paid Ads ROI Calculator
Pick an industry, set your budget and horizon, then slide between SEO and paid to see the cumulative revenue crossover. Find the month SEO becomes cheaper for your scenario.
Scenario inputs
Pick your industry
Industry presets set realistic 2026 paid CPCs, SEO ramp curves, conversion rates, and AOVs. You can override the conversion rate and AOV below.
Your numbers
Monthly marketing budget for these two channels combined. Average order value (or annual contract value) and target conversion rate from visit to customer.
Time horizon
How long are you running this scenario? SEO economics rarely beat paid inside 12 months — pick 24 or 36 for the realistic crossover.
Allocation: SEO vs Paid
Slide between channels. Each percent of SEO is monthly spend going into content, technical SEO, and links rather than ad spend.
Your scenario
Cumulative revenue: SEO vs Paid vs Total spend
Your scenario crosses over at month 14 — SEO becomes the lower-cost channel well before your 36-month horizon ends. Worth increasing SEO allocation toward 60-70% if cashflow allows.
How to Read SEO vs Paid Ads ROI
Four things this calculator gets right that simple "SEO vs PPC" comparisons usually miss.
SEO has setup months with zero traffic
Google needs time to crawl, index, evaluate, and rank new content. The first 2 to 4 months of an SEO program are pure investment — content production, technical fixes, early links — with little measurable organic traffic. Models that show SEO traffic from month 1 are wrong.
The cost-per-visit gap is real, not theoretical
Paid CPC stays roughly constant (often rising with competition). SEO cost-per-visit drops dramatically once rankings mature — by month 36 a $2,000/mo SEO spend can drive the same visits as $20,000/mo of paid in the same category. The chart shows where those curves cross.
Industry changes the answer by 10x
SEO vs paid economics for B2B SaaS (paid CPC $12, mature SEO CPV $0.60) look nothing like ecommerce (paid CPC $2.50, mature SEO CPV $0.20). A universal answer to "SEO or paid?" is always wrong — the right answer is industry-specific.
The horizon decides the winner
At 12 months, paid almost always wins on cumulative revenue. At 36 months, SEO almost always wins for the same spend. The hard call is in between — and that is exactly what the crossover-month finder is for.
Typical Crossover Months by Industry
Approximate month when an even 50/50 split sees SEO cumulative revenue overtake paid, assuming competent execution and a steady budget.
B2B SaaS
Crossover: month 14–18. High paid CPCs and content-heavy SEO favour the SEO investment quickly once authority builds.
Professional services
Crossover: month 16–20. Authority-content compounds well for legal, finance, accounting.
Real estate
Crossover: month 14–18. Suburb pages and market reports become evergreen referral assets.
Home services / Tradies
Crossover: month 10–14. Google Business Profile plus local SEO punches above its weight here.
Local services
Crossover: month 9–13. The cheapest category to win on SEO if GBP is strong.
Ecommerce
Crossover: month 18–28. Paid Shopping is hard to beat early; SEO wins on category breadth and brand search by year 2.
SEO vs Paid Ads ROI Calculator FAQ
How accurate is this calculator?
It produces directional estimates, not precise forecasts. Industry CPCs and SEO ramp curves vary by category, competitive intensity, and execution quality. Use the output to compare scenarios and find the crossover month — not as a guarantee of exact returns. Real performance can vary 30 to 50% in either direction.
Why does SEO show zero traffic in the first few months?
Because that is the reality. Google needs time to crawl, index, evaluate, and rank new or improved content. The first 2 to 4 months of an SEO program are setup (technical work, content production, early links) with little measurable organic traffic. Real SEO traffic typically starts at month 4 to 6 and compounds from there.
What is the "crossover month"?
The month at which your SEO allocation generates more cumulative revenue than your paid allocation would have at the same total spend. It is the moment SEO becomes the lower-cost channel for that scenario. Industries with high paid CPCs (B2B SaaS, professional services) hit the crossover earlier; commodity ecom takes longer.
How is the SEO efficiency curve modelled?
A piecewise function: zero traffic during setup months (industry-specific), linear ramp from setup to month 12 reaching the industry-typical "mature SEO" cost-per-visit, then continued slower decline to month 36. The model assumes consistent monthly investment and competent execution.
Does this account for AI Overviews and zero-click search?
Partially. The SEO ramp curve baked into the industry presets reflects 2026 conditions including reduced click-through from AI Overviews. If your category is especially AI-Overview-heavy (factual queries, definitions), reduce the SEO traffic output by another 20 to 30% mentally.
Is my input sent anywhere?
No. All calculations run locally in your browser. Nothing is uploaded or stored.
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