SEO ROI Calculator
This calculator models SEO return on investment over 6, 12, or 24 months from editable industry benchmark presets, comparing doing it yourself, hiring an agency, and running software. Every assumption behind the S-curve growth model is published on this page, and the maths runs in your browser. No signup.
Used only to label your results so you can tell one scenario from another. It does not look anything up and does not change a single number. To reflect your market, edit the Monthly Local Searches slider.
Everything below is a modelled estimate calculated in your browser from the values on this page and published industry benchmarks. It is not live data from Google, Google Ads, Search Console, or any third-party SEO provider, and nothing about your city or website is looked up. The assumptions behind the model are published at the bottom of these results.
Projected Growth
| Metric | DIY ($200/mo) | theStacc | Agency |
|---|---|---|---|
| Total cost | — | — | — |
| Projected revenue | — | — | — |
| ROI | — | — | — |
| Break-even | — | — | — |
| Content volume | — | — | — |
SEO vs Google Ads
Select an industry above to see how SEO compares to Google Ads for your business.
- Traffic follows an S-curve: click-through rate climbs from 0.5% in month 1 toward a ceiling of 18%, with the curve's midpoint at month 5.
- Monthly clicks = your monthly searches x that month's click-through rate. Leads = clicks x your conversion rate. Revenue = leads x your lifetime value.
- Execution speed multipliers move you along the curve: DIY 0.55x, theStacc 1.0x, agency 1.25x. They are editorial assumptions about consistency of output, not measured results.
- Costs: DIY fixed at $200/mo, theStacc at whatever you set the SEO Investment slider to, agency at the per-industry benchmark in the table below the calculator.
- The Google Ads comparison values your organic clicks at the published benchmark CPC for your industry. It is an equivalent-value illustration, not a quote or an auction price.
- Nothing here accounts for your current rankings, domain authority, competition, or seasonality. Real outcomes vary widely.
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The theStacc SEO ROI Calculator models your search engine optimization return on investment from published industry benchmarks that you can edit. Select your industry to load a benchmark preset, then adjust customer lifetime value, conversion rate, monthly searches, and SEO budget to see 12-month compound growth projections. Every figure is a modelled estimate computed in your browser — nothing is looked up for your city or your website, and the full model is published in the Model Assumptions panel. The calculator compares three scenarios — DIY ($200/mo), theStacc ($99/mo), and agency ($2,000-4,000/mo) — showing total cost, projected revenue, ROI, and break-even month for each. It also calculates your Google Ads equivalent spend, so you can see exactly how much SEO saves you versus pay-per-click advertising. Best for local business owners deciding whether to invest in SEO and which approach delivers the best return.
How to Calculate SEO ROI for Your Business
SEO ROI measures the return you get from investing in search engine optimization. The formula is simple: (Revenue from organic traffic - SEO cost) / SEO cost x 100. But the inputs matter more than the formula.
For local businesses, the key variable is customer lifetime value (LTV). A dental patient worth $1,200 over their lifetime changes the math. If SEO brings in 5 new patients per month by month 6, that's $6,000/month in LTV from a $99/month investment — a 6,000% return in that scenario.
The second variable is time. SEO is not instant. Months 1-3 build the foundation (content, technical fixes, authority signals). Months 4-6 show acceleration. Months 7-12 deliver compounding returns as content stacks and rankings improve. This is why short-term thinking kills SEO investments. Most businesses quit right before the curve inflects.
This calculator uses an S-curve growth model rather than a flat growth rate, so ranking improvement compounds over the projection window instead of arriving all at once. It seeds each input with an industry benchmark so you have a sensible starting point rather than a blank form. Those benchmarks are national published averages — the closer you replace them with your own conversion rate, lifetime value, and local search volume, the more the projection is worth.
SEO ROI Calculator Comparison
| Feature | theStacc | Ahrefs | BrightEdge | Embarque |
|---|---|---|---|---|
| Price | Free | Paid tool ($99+/mo) | Enterprise (custom) | Agency service |
| Live keyword volume data | No — editable benchmarks | Yes — proprietary | Yes — proprietary | No — manual estimate |
| Industry presets | Yes — 8 industries | No | No | No |
| DIY vs Agency vs Tool comparison | Yes — 3-way | No | No | Partial |
| S-curve growth model | Yes — realistic | No | No | No — linear |
| Google Ads cost comparison | Yes — benchmark CPC | Partial | Partial | No |
| Visual growth chart | Yes — interactive | No | Yes | No |
| Shareable results | Yes — copy or image | No | No | No |
Industry Benchmark Data
These benchmarks are compiled from industry studies, agency reporting, and platform data. They represent typical ranges for local service businesses in mid-size US markets. Your actual numbers may vary based on competition, market size, and execution quality.
| Industry | Avg LTV | Conv. Rate | Monthly Searches | Google Ads CPC | Agency Cost |
|---|---|---|---|---|---|
| Dentist | $1,200 | 8% | 800-1,500 | $6-10 | $2,000-3,000/mo |
| Plumber / HVAC | $2,500 | 12% | 600-1,200 | $20-35 | $1,500-2,500/mo |
| Lawyer | $5,000+ | 5% | 400-800 | $50-120 | $3,000-5,000/mo |
| Real Estate | $8,000 | 3% | 500-1,000 | $8-15 | $2,000-3,000/mo |
| Restaurant | $300 | 15% | 1,000-2,000 | $2-5 | $1,000-2,000/mo |
| Auto Repair | $800 | 10% | 500-900 | $8-15 | $1,500-2,500/mo |
| Chiropractor | $1,500 | 8% | 400-700 | $10-20 | $1,500-2,500/mo |
| Salon / Spa | $600 | 10% | 600-1,000 | $3-8 | $1,000-2,000/mo |
Sources: WordStream CPC benchmarks (2024), HubSpot conversion rate benchmarks, and published agency pricing surveys. Ranges represent mid-size US markets; major metros (NYC, LA, Chicago) may be 2-3x higher. These are the exact values loaded when you pick an industry above — override them with your own wherever you can.
SEO vs Google Ads: Which Is Better for Local Businesses?
Google Ads delivers instant traffic. You pay per click, you get visitors today. When you stop paying, the traffic stops. SEO takes longer but creates a compounding asset. Every article, every backlink, every month of authority stacks on the last.
For most local businesses, the crossover point is around month 6-8. Before that, Google Ads delivers more traffic per dollar. After that, SEO traffic volume exceeds what you could afford from ads. And it keeps growing even if you reduce your investment.
The cost gap is dramatic for competitive industries. A personal injury lawyer pays $80+ per click on Google Ads. That same click from organic search costs $0. At 50 clicks per month, that's $4,000/month in equivalent ad value from a $99/month SEO investment.
How Long Does SEO Take to Work?
SEO follows an S-curve, not a straight line. Months 1-3 are the foundation phase. You're publishing content, fixing technical issues, and building authority signals. Visible results are minimal. Months 4-6 are the acceleration phase. Content starts ranking, traffic picks up noticeably. Months 7-12+ are the compounding phase. Earlier content climbs higher, new content ranks faster, and organic traffic grows exponentially.
The biggest mistake is quitting during months 2-4. The investment feels wasted because results haven't materialized yet. But the work done in those months is what makes months 7-12 work. It's like planting seeds. The harvest doesn't come the day you plant.
SEO ROI by Industry
The figures below are worked examples produced by the same model and the same published benchmarks the calculator uses. They illustrate how the maths behaves for each industry — they are not measured results from theStacc customers.
Dentists
Average patient LTV of $1,200. With 1,200 monthly searches for dental services in a mid-size city and an 8% conversion rate, SEO typically delivers 5-15 new patient inquiries per month by month 8. Break-even usually happens around month 4-5 at a $99/mo investment.
Plumbers & HVAC
Higher LTV ($2,500 for recurring maintenance relationships) but also higher Google Ads CPC ($25/click). This means SEO ROI is especially strong. Equivalent ad spend would be $625/month for the same 25 organic clicks. Emergency service keywords convert at 12%+.
Lawyers
Highest LTV ($5,000-$50,000 per case) and highest CPC ($80+/click). A single client from organic search can pay for years of SEO investment. The math is overwhelming: even at a conservative 5% conversion rate, 3 new clients per month from SEO = $15,000/mo in revenue from a $99/mo investment.
Restaurants
Lower LTV ($300) but highest search volume (1,500/mo) and conversion rate (15%). Volume makes up for the lower per-customer value. Google Business Profile optimization is especially impactful. Map pack visibility drives direct foot traffic.
Frequently asked questions
SEO ROI = (Revenue from organic traffic - SEO investment) / SEO investment x 100. For local businesses, track new customers from organic search, multiply by customer lifetime value, and subtract your monthly SEO cost. Most local businesses see positive ROI within 4-8 months. This calculator starts you from published industry benchmarks for each input and lets you overwrite every one of them with your own numbers.
Yes. Local SEO delivers 3-10x ROI for most service businesses. A dentist investing $99/mo in SEO can expect 5-15 new patient inquiries per month by month 6-8, with each patient worth $1,000+ in lifetime value. The key variables are customer lifetime value, local search volume, and conversion rate — all of which this calculator factors in using published industry benchmarks you can adjust. Those figures are typical ranges, not a forecast for your business.
SEO follows an S-curve: minimal results in months 1-3 (foundation building), noticeable improvement in months 4-6 (acceleration), and strong compounding returns from month 7 onward. Most local businesses break even between months 4-8. The biggest mistake is quitting during months 2-4 when the foundation work has not yet produced visible rankings. This calculator models realistic S-curve growth, not linear projections.
Google Ads delivers instant traffic but stops when you stop paying. SEO takes longer but compounds over time. For most local businesses, SEO becomes more cost-effective around month 6-8 and dramatically outperforms ads by month 12. A personal injury lawyer paying $80/click would spend $4,000/month for 50 clicks from ads. The same 50 clicks from SEO cost $0 after the initial investment — and keep growing.
Yes, 100% free. No signup or credit card needed. Select your industry, adjust the sliders, and the projection updates instantly. Every calculation runs in your browser and nothing you type is sent anywhere.
Each industry button loads a preset — lifetime value, conversion rate, monthly searches, Google Ads CPC, and typical agency cost — taken from published national benchmarks listed in the Industry Benchmark Data table further down this page. Nothing is looked up for your specific city or business, and the calculator makes no network requests. If you know your own conversion rate, lifetime value, or local search volume, type them in: the sliders overwrite the presets and the projection recalculates from your numbers.
Customer lifetime value is the total revenue you expect from one customer over their entire relationship with your business. A dental patient might return twice a year for 5 years = $1,200 LTV. A personal injury client might be a one-time $15,000 case. Higher LTV means SEO ROI scales dramatically because each new customer is worth more. This calculator uses industry-specific LTV benchmarks that you can adjust.
They are modelled estimates, not forecasts. Every figure comes from the inputs on screen run through the S-curve model published in the Model Assumptions panel — none of it is measured from your website or your market. They assume consistent SEO effort (content publishing, technical optimization, authority building). Actual results vary by competition level, starting domain authority, and execution quality. The S-curve growth model is conservative — many businesses outperform these projections. The calculator is designed to show realistic ranges, not promises.
DIY assumes you spend $200/month on tools and 10+ hours/week doing the work yourself, with slower growth (0.5x multiplier) due to inconsistent execution. Agency assumes $2,000-4,000/month with professional execution (1.2x multiplier) but high cost. theStacc assumes $99/month for automated content + GBP posts + social media (1.0x multiplier) — professional volume at a fraction of agency cost.
Hire an agency if you have a $3,000+/month budget and need custom strategy for a complex, competitive market. Use theStacc if you are a local business that needs consistent content, GBP optimization, and review management at $99/month — the same volume an agency delivers for 5-10x less. Many businesses start with theStacc, see results, and then decide whether to scale up with an agency.
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