marketing · 2026-05-01

Free trial conversion economics

Project SaaS free-trial economics — sign-ups, activation, trial-to-paid conversion, and CAC payback for trial-led GTM.

CAC payback (months)
5.7

Inputs

Monthly trial signups1,500
Activation rate %35%
Trial → paid %18%
Avg ARR per customer$1,800
Paid acquisition CAC per signup$90
% organic / unpaid signups40%

Supporting metrics

Monthly MRR acquired$14,100
Blended CAC per paid customer$862
Paid conversions / month94

About this calculator

Trial economics — the GTM signal SaaS founders watch most

Trial-led GTM has 3 leaks: signup → activation, activation → paid, and the question of whether your CAC actually pays back in <12 months.

The funnel

signups → activated (reached aha moment) → trial-to-paid converters

Default scenario: 1,500 signups × 35% activation × 18% conversion = 94 paid customers/month. Blended CAC against the funnel determines payback.

Activation is the tells-you-everything metric

Most failing trials don't fail at conversion — they fail at activation. If <30% of signups reach the aha moment in the trial window, conversion math doesn't matter; the product isn't pulling them in.

Conversion benchmarks

The reverse-trial play

PLG (product-led growth) variations:

What to fix when payback is slow

  1. Higher activation rate: improve onboarding, reduce time-to-aha
  2. Better trial UX: in-app prompts to convert, friction-free upgrade path
  3. Tighter pricing: too-low ACV forces long payback even at strong conversion
  4. Channel shift: cut the most expensive paid channels in favor of organic

FAQ

What's a healthy CAC payback period?

<12 months: excellent. 12-18 months: healthy. 18-24 months: marginal but acceptable for venture-backed companies with capital. >24 months: GTM probably broken; fix activation/conversion before raising capital. Most public SaaS targets ~14 months.

Should I require credit card upfront?

Trade-off. CC-required trials: 3-5x lower signups, 2-3x higher trial-to-paid (selects for buyers). No-CC trials: high volume, more product feedback. Most modern PLG: hybrid — no-CC for free tier, CC required for trial of premium tier.

What's the difference between activation and aha moment?

Activation = a measurable behavior signaling commitment (e.g. 'created 3 projects' or 'invited 1 teammate'). Aha moment = the cognitive/emotional click of 'I get it now.' Activation is the proxy you measure; aha is what you're trying to engineer. Pick activation events that correlate with future paid conversion.