SEO ROI Calculator
Forecast organic traffic, leads, revenue and payback from an SEO investment — with two things almost no other calculator models honestly: AI Overview click loss and a realistic ramp-up curve. Every benchmark is sourced and labelled by how much you should trust it. Works in INR or USD.
1 · Search opportunity
Sum the monthly search volume of every keyword you realistically intend to rank for.
Positions 1–2 measured (GrowthSRC 2025). Positions 3–10 interpolated from the Backlinko 2019 shape — no source publishes a full current table.
Sets the AI Overview haircut below. 99.2% of AI-Overview-triggering keywords are informational.
Pew Research found clicks fell from 15% to 8% of visits when an AI summary appeared (−47%). Ahrefs measured position-1 CTR down 58% on AI-Overview keywords. Amsive found branded queries actually gained 18.7%. Adjust to your keyword mix.
2 · Conversion economics
Reference: Ruler Analytics measured 4.9% for organic search across 110M sessions; First Page Sage reports 2.6% B2B. Use your own analytics if you have it.
No credible study isolates SEO close rate — see the note below the results.
Use lifetime value if you have repeat purchase data; first-order value if not.
Set to 100 to model on revenue. Set to your real margin to model on gross profit — the more honest basis for ROI.
3 · Investment and timing
Retainer, salary, content and tools combined.
Audit, migration, site build. Leave at 0 if none.
No published study establishes a ramp curve. Ahrefs measured that only 1.74% of new pages reach the top 10 within a year, and the average #1 page is 5 years old — so 12 months is the optimistic case, not the cautious one.
4 · Paid comparison (optional)
WordStream 2026, 13,474 US search campaigns, medians.
Auto-filled from the industry benchmark. Indian CPCs run materially below US medians — edit this to your own Google Ads data.
Month-by-month projection
The ramp uses a smooth S-curve reaching full effect in the month you set. The break-even row is highlighted.
| Month | Ramp | Sessions | Leads | Customers | Gross profit | Spend | Cumulative net |
|---|---|---|---|---|---|---|---|
| 1 | 2% | 21 | 0.5 | 0.1 | ₹2,656 | ₹40,000 | ₹-37,344 |
| 2 | 7% | 80 | 2 | 0.4 | ₹10,000 | ₹40,000 | ₹-67,344 |
| 3 | 16% | 169 | 4.2 | 0.8 | ₹21,094 | ₹40,000 | ₹-86,250 |
| 4 | 26% | 280 | 7 | 1.4 | ₹35,000 | ₹40,000 | ₹-91,250 |
| 5 | 38% | 406 | 10.2 | 2 | ₹50,781 | ₹40,000 | ₹-80,469 |
| 6 | 50% | 540 | 13.5 | 2.7 | ₹67,500 | ₹40,000 | ₹-52,969 |
| 7 | 62% | 674 | 16.8 | 3.4 | ₹84,219 | ₹40,000 | ₹-8,750 |
| 8 | 74% | 800 | 20 | 4 | ₹1.00 L | ₹40,000 | ₹51,250 |
| 9 | 84% | 911 | 22.8 | 4.6 | ₹1.14 L | ₹40,000 | ₹1.25 L |
| 10 | 93% | 1,000 | 25 | 5 | ₹1.25 L | ₹40,000 | ₹2.10 L |
| 11 | 98% | 1,059 | 26.5 | 5.3 | ₹1.32 L | ₹40,000 | ₹3.02 L |
| 12 | 100% | 1,080 | 27 | 5.4 | ₹1.35 L | ₹40,000 | ₹3.98 L |
| 13 | 100% | 1,080 | 27 | 5.4 | ₹1.35 L | ₹40,000 | ₹4.92 L |
| 14 | 100% | 1,080 | 27 | 5.4 | ₹1.35 L | ₹40,000 | ₹5.88 L |
| 15 | 100% | 1,080 | 27 | 5.4 | ₹1.35 L | ₹40,000 | ₹6.83 L |
| 16 | 100% | 1,080 | 27 | 5.4 | ₹1.35 L | ₹40,000 | ₹7.78 L |
| 17 | 100% | 1,080 | 27 | 5.4 | ₹1.35 L | ₹40,000 | ₹8.72 L |
| 18 | 100% | 1,080 | 27 | 5.4 | ₹1.35 L | ₹40,000 | ₹9.68 L |
| 19 | 100% | 1,080 | 27 | 5.4 | ₹1.35 L | ₹40,000 | ₹10.63 L |
| 20 | 100% | 1,080 | 27 | 5.4 | ₹1.35 L | ₹40,000 | ₹11.57 L |
| 21 | 100% | 1,080 | 27 | 5.4 | ₹1.35 L | ₹40,000 | ₹12.53 L |
| 22 | 100% | 1,080 | 27 | 5.4 | ₹1.35 L | ₹40,000 | ₹13.47 L |
| 23 | 100% | 1,080 | 27 | 5.4 | ₹1.35 L | ₹40,000 | ₹14.43 L |
| 24 | 100% | 1,080 | 27 | 5.4 | ₹1.35 L | ₹40,000 | ₹15.38 L |
Cite or embed this calculator
Free to cite, quote and embed, including commercially. A visible link back is all that is asked. Journalists and researchers: the full source list and the underlying formulas are below, and I am happy to comment on the record — get in touch.
Prasad, S. (2026). SEO ROI Calculator. https://example.com/seo-roi-calculator
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<p>Calculator by <a href="https://example.com/seo-roi-calculator">Swaraj Prasad</a></p>
How each number is calculated
| Output | Formula |
|---|---|
| Monthly sessions | Search volume × CTR at target position × (1 − AI Overview loss) |
| Leads | Sessions × conversion rate |
| Customers | Leads × close rate |
| Gross profit | Customers × average revenue × gross margin |
| Ramp factor, month n | Smooth S-curve from 0 to 1 over the ramp period, then held at 1 |
| Cumulative net | Σ gross profit − (setup cost + Σ monthly spend) |
| ROI | (Σ gross profit − Σ total cost) ÷ Σ total cost × 100 |
| Break-even month | First month where cumulative net turns positive |
| Paid equivalent | Sessions × cost per click |
Sources
- Pew Research Center (2025). Google users are less likely to click on links when an AI summary appears. 900 US adults, 68,879 searches. Clicks fell from 15% to 8% of visits. Independent pewresearch.org
- Ahrefs (2026). AI Overviews reduce clicks — position-1 CTR down 58%, 300k keywords. Vendor study ahrefs.com
- Sistrix (2026). Position-1 CTR 27% without AI Overviews vs 11% with, across 100M+ keywords. Vendor study via Search Engine Journal
- Amsive (2025). AI Overview click drop-off: non-branded −19.98%, branded +18.68%. Agency study amsive.com
- GrowthSRC Media (2025). Organic CTR study — position 1 fell 28% to 19% year on year; position 2, 20.83% to 12.60%. 200k+ keywords from Search Console. Agency study growthsrc.com
- Backlinko (2019). CTR by position, 1.3M pages. Widely republished as current — the underlying data is 2019. Vendor study, dated backlinko.com
- First Page Sage (2025). CTR by ranking position — a meta-analysis with no disclosed sample size. Position 1 at 39.8% cannot be reconciled with Sistrix or GrowthSRC. Agency marketing firstpagesage.com
- Ruler Analytics (2026). Conversion rate by industry and channel — organic search 4.9%, across 110M+ sessions. Vendor study ruleranalytics.com
- WordStream / LocaliQ (2026). Google Ads benchmarks — 13,474 US search campaigns, medians by industry. Average CPC $5.42, CPL $66.69. Vendor study wordstream.com
- Ahrefs (2023). How long it takes to rank — only 1.74% of new pages reach the top 10 within a year; 72.9% of top-10 pages are over three years old. Vendor study ahrefs.com
- Ahrefs (2024). SEO pricing survey — 439 providers. Average retainer $2,917/month; 76% of Indian providers charge under $1,000/month. Vendor study ahrefs.com
- SparkToro / Similarweb (2026). 68.01% of US Google searches end without a click. Independent panel via Search Engine Land
What this tool cannot do. It cannot tell you whether you will actually reach your target position, which is the single biggest variable in the whole model. It assumes your conversion rate holds as traffic scales, which it usually does not. And it models one keyword set at one average position, when real organic performance is a long-tail distribution. Use it to structure an argument and test assumptions, not to promise a number to a client or a board.
Built by Swaraj Prasad. Last reviewed August 2026. Found an error in a formula or a source? Tell me and I will fix it and credit you.
Read the detailed guideline how I created the SEO ROI Calculator.
Read the dense seo glossary playbook here : https://swarajprasad.blogspot.com/2026/08/seo-glossary-playbook.html
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