#941 · Startup Tool

Pre Seed LTV Calculator

Estimate customer lifetime value for a pre-seed startup using ARPU, gross margin, churn, support cost, and CAC. Use the result to judge whether your acquisition economics are strong enough for fundraising.

Calculator

Unit economics inputs
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How to use this calculator

  1. Enter average monthly revenue per customer.
  2. Add gross margin after direct service costs.
  3. Enter monthly churn as a percentage.
  4. Add CAC to compare lifetime value against acquisition cost.

What the result means

A higher LTV means each customer creates more long-term value. Pre-seed startups should not expect perfect data, but an LTV:CAC ratio below 2.0 usually signals weak acquisition efficiency or excessive churn.

LTV = (ARPU × Gross Margin) × (1 ÷ Monthly Churn). LTV:CAC = LTV ÷ CAC.

Use this as a directional estimate. Very early cohorts can be noisy, so compare conservative and optimistic assumptions before using it in an investor model.

Example calculation

If ARPU is $100, gross margin is 80%, monthly churn is 5%, and CAC is $500, estimated LTV is $1,600 and LTV:CAC is 3.20.

Tips for better results

  • Reduce early churn before increasing paid acquisition.
  • Improve gross margin by lowering service or infrastructure cost.
  • Increase expansion revenue through upgrades or seats.
  • Do not pitch LTV from a tiny cohort without explaining the assumption.

FAQ

How do I calculate customer lifetime value for a pre-seed SaaS startup?

Use monthly ARPU, gross margin, churn, and CAC. A simple early-stage method is ARPU multiplied by gross margin, then multiplied by estimated customer lifetime.

What is a good LTV to CAC ratio before raising pre-seed funding?

A ratio above 3.0 is usually healthy for early SaaS, while below 2.0 suggests acquisition or retention needs improvement before scaling.

Should pre-seed startups use churn or customer lifetime for LTV?

Use churn when you have enough customer data. If data is limited, use an explicit lifetime assumption and label it clearly.

How does monthly churn affect startup LTV?

Higher churn shortens customer lifetime and reduces LTV. Even a small churn reduction can materially improve the economics.

Can I include expansion revenue in pre-seed LTV?

You can include it if expansion is already happening. If it is only a plan, keep it in an optimistic scenario rather than the base case.

Startup decision table

MetricMeaning
Main ResultEstimated lifetime value per customer
BenchmarkLTV:CAC ratio and health score
Decision UseCheck whether CAC can scale responsibly

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