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B2B Webinar ROI Calculator

What a webinar really returns. Production and promotion costs, sign-ups, attendees, conversion and deal value: CPL, CAC, payback and 12-month ROI.

Cost and funnel

The hidden cost of a webinar

A webinar’s bill has three parts: platform and editing (the only thing almost everyone counts), promotion (which many forget when reporting) and internal hours for prep, rehearsal, the session and follow-up. Internal hours are usually the biggest line: one team member spending 40 hours organizing the event costs €2,000+ fully loaded, more than the platform.

Leave those hours out and the ROI looks artificially high. This calculator makes you enter them. Once you add everything up, the webinar’s real CAC may surprise you.

When a webinar beats the blog

  • • Complex product: you need a demo + live Q&A. A blog tries and can’t.
  • • High deal value: if a customer is worth over €5k, the acceptable cost per lead is higher and a webinar can pay off.
  • • An existing audience: with a big list, a webinar brings in better-qualified leads than the blog itself.
  • • Co-marketing: with a partner, you split the cost and multiply the audience.
  • • Time-sensitive topic: a regulatory change, an industry launch. A webinar capitalizes on urgency.

When NOT to run a webinar

  • • A small list with no ad budget: you’ll get about 30 people.
  • • Low deal value (under €500): the CAC doesn’t justify the investment.
  • • A product people get in 2 minutes: a video or landing page converts just as well without the cost of an event.
  • • A team with no experience presenting live: visible nerves lower conversion.
  • • A market saturated with webinars (HR tech, sales tools, etc.): attention is expensive.

How to increase post-webinar conversion

  1. Follow up within 24 h with the recording + an exclusive bonus for attendees.
  2. One clear CTA during the webinar (not 3 offers, one).
  3. A real Q&A, not a planted one. People connect when there are honest questions.
  4. Paid retargeting for sign-ups who didn’t attend (with the on-demand recording).
  5. Hand-off metrics for sales: an SDR calls within 48 h, not a week later.

Typical examples

  • • SMB B2B SaaS, €100/month plan: a webinar with 400 sign-ups, 160 attendees, 24 opportunities, 6 customers. 24-month revenue: ~€17k. ROI ~3×.
  • • Enterprise SaaS, €50k/year deal: a small webinar with 60 highly qualified sign-ups, 30 attendees, 4 opportunities, 1 close. Very high ROI if the deal closes.
  • • B2C consumer, €50 order value: a webinar rarely makes sense. Better to invest in social and SEO.

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