#940 · Startup Tool

Pre Seed CAC Calculator

Estimate pre-seed customer acquisition cost and compare it with customer lifetime value. The calculator helps founders judge whether early acquisition is efficient enough to scale.

Calculator

Startup inputs
USD
USD
customers
USD
Ad space

How to use this calculator

Enter marketing spend, sales-related cost, new customers acquired, and average customer LTV.

The calculator estimates CAC, compares it with LTV, and gives an acquisition efficiency signal.

What the result means

CAC shows how much it costs to acquire one customer. The LTV:CAC ratio indicates whether the customer value is high enough to justify acquisition spend.

CAC = (Marketing Spend + Sales Cost) ÷ New Customers Acquired; LTV:CAC Ratio = Customer LTV ÷ CAC.

For many SaaS startups, an LTV:CAC ratio near 3:1 is healthy. Below 1:1 means acquisition loses money unless retention or pricing improves.

Example calculation

With $15,000 marketing spend, $6,000 sales cost, 90 new customers, and $1,800 LTV, CAC is $233 and LTV:CAC is 7.71.

Tips for better results

  • Separate paid, organic, referral, and founder-led acquisition CAC.
  • Do not scale channels until payback and retention are acceptable.
  • Improve landing page conversion before increasing ad spend.
  • Use net new paying customers, not leads, for true CAC.

FAQ

How do I calculate CAC for a pre-seed startup?

Add marketing spend and sales cost, then divide by the number of new paying customers acquired.

What LTV to CAC ratio is good for a pre-seed SaaS company?

A ratio around 3:1 is often considered healthy, but very early startups should also consider data quality and retention risk.

Should founder sales time be included in CAC?

For strict unit economics, founder sales time can be valued and included, but many early startups track it separately at pre-seed.

Why is my CAC high even with low marketing spend?

CAC can be high if few customers convert, sales cycles are long, or paid traffic produces leads that do not become paying customers.

When is pre-seed CAC reliable enough to use for fundraising?

CAC is more reliable when it comes from repeatable channels, paying customers, and several acquisition cycles rather than a one-time campaign.

Startup metric table

MetricMeaning
Primary metricCAC
Decision useUse this result to judge startup health, investor readiness, and next operating priorities.
BenchmarkFor many SaaS startups, an LTV:CAC ratio near 3:1 is healthy. Below 1:1 means acquisition loses money unless retention or pricing improves.
RecommendationImprove the weakest driver before scaling spend or fundraising assumptions.

Browse more calculators

Category hubs