What it does
This calculator models a link-building campaign as a business investment: you buy placements at a known cost; those placements drive traffic with a 2-month lag (indexing, ranking maturation); traffic converts at your conversion rate; customers contribute revenue over their lifetime. The output projects cumulative revenue against cumulative cost over the campaign + 6 months of tail.
Unlike the more general SEO ROI calculator, this one models the mechanics specific to link building — placement cadence, per-placement cost, average DR, and the lag between placement and ranking effect.
When to run this calculation
Run this calculator before committing to a link-building retainer or before scoping an in-house outreach hire. It helps you answer three questions:
- Is the budget the right size for the niche? $1K/month in a competitive SaaS niche buys you ~3 mid-DR placements. The math at that volume usually doesn't close.
- What's the realistic break-even window? Most link-building programs break even somewhere between month 7 and month 12 of a 9-month campaign — meaning the program needs to run long enough for the trail to recoup the cost.
- What's the cost-per-customer? Comparing this to your paid-acquisition CAC tells you whether SEO is genuinely cheaper than ads, or just slower ads.
How to use this calculator
- Set the campaign cadence. Placements per month and average cost per placement multiply to give you monthly burn. 8 placements at $350 = $2,800/month — typical small-retainer spend.
- Pick the campaign duration. Most retainers run 6–12 months. Shorter than 6 months rarely shows meaningful break-even. Longer than 18 months is unusual without re-scoping.
- Set the expected traffic lift. Conservative: 2–3%/month from links alone. Strong campaign: 4–6%/month. Anything above 8% on an established site is unusual and should be questioned.
- Add your conversion economics. Same fields as any ROI calculator: visits → customers, deal value, customer lifetime.
- Read the chart. Cost is the dashed line; revenue is coral. Where they cross is break-even. Your cost-per-customer (total spend ÷ acquired customers) is the single most important comparison metric.
Using the result honestly
- Be conservative on traffic lift. 4%/month sounds modest but compounds to 60%+ over a year — already a strong outcome. Don't default to 6–8%.
- Factor in the lag. The calculator uses 2 months. Newer sites or competitive niches can take 3–4 months for placement effects to materialize.
- Compare against paid CAC. If your paid acquisition CAC is $200, link-building cost-per-customer below $200 means SEO is cheaper. Above means slower-ads — still potentially worth it for compounding effects, but with eyes open.
- Run scenarios. Conservative, expected, and aggressive. The conservative scenario should still close the math; if it doesn't, the budget is wrong-sized for the niche.
- Re-run quarterly with real data. Replace estimated traffic lift with actual measured lift after 3 months of campaign data. The calculator becomes a real forecast at that point.
Frequently asked questions
What's a realistic traffic lift per month from link building?
2–3% per month is conservative. 4–6% is a strong, well-executed campaign with good content and anchor distribution. Above 8% on an established site is unusual — possible during specific algorithm updates, but not a good baseline assumption.
Why is there a 2-month lag in the model?
Backlinks take time to take effect: 1–2 weeks for indexing, then 2–8 weeks for ranking impact to materialize. Two months is a reasonable middle estimate. Newer sites or more competitive niches can take longer.
Why does revenue keep growing after the campaign ends?
Backlinks compound — they keep delivering value after acquisition. The calculator extends 6 months past campaign end to capture the tail. In reality, well-built links keep delivering for years, but modeling beyond 6 months gets speculative.
How does this differ from the SEO ROI calculator?
The SEO ROI calculator models all SEO investment generically. This one is specific to link-building campaigns: placement cadence, cost per placement, ranking lag. Use this when scoping a link-building retainer specifically; use the SEO ROI calculator for a broader SEO budget decision.
What if my ROI comes out negative?
Either: (a) the budget is wrong-sized for the niche, (b) your conversion economics need work before SEO investment, or (c) link building is the wrong channel for your business model. The calculator's job is to surface this before you commit budget. Negative ROI is a signal to fix something upstream — not a reason to lower expectations on the same plan.
Should I include in-house team cost?
Yes, in the avg cost per placement field. If you're paying $200 for the placement plus $150 of internal time, use $350 as the effective cost. Excluding internal cost makes ROI look better than it is.
Will this tool log my data?
No. Everything runs in your browser. The numbers you enter never leave your device — there is no server endpoint and nothing to log.