Inbound Marketing Calculator

How to use the calculator

Five inputs, two minutes, one number your stakeholders will engage with.

1. 01

   Enter your funnel baseline

   Add your monthly website visitors, visitor-to-lead rate, lead-to-MQL rate, MQL-to-SQL rate, SQL close rate, and average deal value. These six inputs define your current inbound marketing funnel in full.

2. 02

   Enter your monthly inbound investment

   Add your content and SEO spend, marketing automation tool costs, and all-in marketing team cost (salaries plus benefits). This is your full monthly inbound investment basis.

3. 03

   Set growth targets

   Traffic growth target is additional visitors from content compounding over 12 months. Funnel conversion improvement captures the lift from better nurture sequences, more relevant content, and improved intent-matching across the funnel.

4. 04

   Read the current funnel output

   The results panel shows your current monthly leads, MQLs, and customers alongside inbound revenue. These numbers are your baseline – they show whether your funnel is converting efficiently before you model any investment.

5. 05

   Review the projection table

   Each month shows the full funnel progression: visitors → leads → MQLs → customers → revenue → revenue gain vs. baseline. The surplus/deficit column shows how cumulative gain tracks against cumulative investment.

Why use this calculator?

Related free tools

Who'll get the most out of this

• VP of MarketingBuilding the inbound ROI case for the annual budget cycle.
• Demand Generation ManagerModeling the funnel impact of a new content or nurture investment.
• Marketing OperationsBenchmarking current funnel efficiency and identifying conversion bottlenecks.
• Inbound Agency LeadShowing a prospect the projected ROI of a retainer before signing.
• Fractional CMOSetting baseline metrics and projecting outcomes for a new client engagement.

Frequently asked questions

• What does this inbound marketing calculator model?+

  The inbound marketing calculator models a full B2B inbound funnel: visitors → leads → MQLs → SQLs → customers → revenue. It projects the 12-month impact of traffic growth and funnel efficiency improvements on top of your current baseline, compares cumulative gain against cumulative investment, and outputs ROI, break-even month, and cost per lead, MQL, and customer. The month-by-month table shows how every stage of the funnel evolves as traffic and conversion rates improve.
• How do you measure inbound marketing ROI?+

  How to measure inbound marketing ROI: (additional revenue from inbound − total inbound investment) ÷ total inbound investment. The challenge is in the numerator – calculating inbound's actual revenue contribution requires multi-touch attribution, CRM source tagging, and an agreed-on model for how to credit inbound touchpoints in multi-channel journeys. This calculator uses a direct-revenue model: visitors times conversion rate times deal value times close rate. It's intentionally conservative and doesn't capture assisted conversions or brand halo effects.
• What's a good inbound marketing ROI benchmark?+

  Inbound marketing ROI benchmarks depend heavily on deal economics. A B2B SaaS company with a $10k ACV and a 20% close rate that invests $20k/month in inbound is targeting break-even within 6–9 months and 200–400% ROI over 18–24 months. Companies with ACV below $2k have harder inbound economics – the cost per customer acquired through content-led nurture can exceed the value unless funnel efficiency is very high. The inbound marketing calculator surfaces whether your deal economics make inbound viable.
• How does funnel conversion improvement work in the calculator?+

  The funnel efficiency improvement input applies a percentage lift to your visitor-to-lead conversion rate. A 15% improvement on a 2% base rate gives 2.3%. This models the impact of better landing pages, more relevant content, improved CTAs, and better nurture sequences. It applies from month 1 in the model. In practice, funnel improvements from a new content or automation programme typically take 2–4 months to show up in data – so treat the first few months of the projection as optimistic and use the back half of the 12-month window as the more realistic read.
• What lead-to-MQL and MQL-to-SQL rates are normal?+

  B2B benchmarks vary by industry and company stage. Lead-to-MQL rate: 20–40% for a well-qualified lead capture mechanism (gated content, demo requests) where most form fills are from your ICP. MQL-to-SQL rate: 30–50% for a functioning sales qualification process. SQL close rate: 20–35% for a competitive B2B market with a structured sales process. If your rates are significantly below these, the bottleneck is usually in the sales process or qualification criteria, not the inbound programme.
• How to measure inbound marketing ROI when attribution is messy?+

  How to measure inbound marketing ROI without clean attribution: start with first-touch and last-touch as brackets. First-touch (contacts whose first interaction was inbound) overestimates inbound's contribution. Last-touch (contacts whose last interaction before close was inbound) underestimates it. A simple position-based model (40% to first touch, 40% to last touch, 20% distributed to middle touches) is a reasonable middle ground for most B2B teams without a mature attribution setup. The inbound marketing calculator uses a simplified direct-revenue model as a floor.
• Should I include team cost in the inbound marketing investment?+

  Yes. The most common mistake in inbound ROI calculations is only counting agency fees and tool costs, not the fully-loaded cost of internal marketing staff. A content manager at $75k salary plus benefits costs roughly $8k/month – that's a significant part of a B2B inbound budget. Including team cost makes the inbound marketing calculator more accurate and gives you a better sense of the true cost per customer acquired.
• What traffic growth rate is realistic for an inbound programme?+

  Traffic growth for an inbound programme: 20–30% over 12 months for a new programme with modest publishing (2–4 pieces per month). 40–60% for a mature programme with 8–12 pieces per month and active distribution. 80%+ for a high-volume inbound programme with programmatic SEO, paid amplification, and consistent link acquisition. The inbound marketing calculator defaults to 40%. Use the projection table to model the break-even at different traffic growth assumptions.
• How is the inbound marketing calculator different from a basic ROI calculator?+

  Basic ROI calculators take total revenue and total spend. The inbound marketing calculator models the full funnel stage by stage: traffic growth compounds through visitor-to-lead, lead-to-MQL, MQL-to-SQL, and close rate in sequence. This matters because different levers have different ROI implications. Improving your visitor-to-lead rate from 2% to 2.3% (a 15% lift) has the same downstream revenue impact as a 15% traffic increase – but the cost of improving conversion is often much lower than acquiring 15% more traffic.
• Can I use this calculator for an inbound marketing agency proposal?+

  Yes. Use conservative inputs for a client with no existing inbound baseline: 20–30% traffic growth, 10–15% funnel efficiency improvement. The projection table is useful for proposals because it shows the investment-heavy first 3 months and the payoff curve in months 6–12. Presenting inbound marketing ROI as a 12-month projection with a clear break-even month is more credible than an annual aggregate – it shows you understand the time dynamics, not just the end-state number.