Valuation

How to Calculate the Lifetime Value (LTV) of a SaaS Customer

LTV calculation with formulas, examples, and common mistakes to avoid.

·7 min read
LTV measures the total net profit a SaaS business earns from a customer across their entire relationship, and accurate calculation requires combining revenue, retention, and cost data rather than relying on simple averages.

Core LTV Formula and Inputs

Start with the standard equation used by most SaaS buyers on platforms such as Acquire.com and Empire Flippers: LTV = (ARPU ÷ Churn Rate) × Gross Margin. ARPU is average revenue per user, churn is the monthly percentage of customers who cancel, and gross margin accounts for hosting, payment processing, and support costs. In 2026, most acquired SaaS companies report gross margins between 75 % and 85 %.

Step-by-Step Calculation Example

Assume a B2B SaaS tool with $150 monthly ARPU, 3 % monthly churn, and 80 % gross margin. Monthly contribution per customer equals $150 × 0.8 = $120. Average customer lifespan is 1 ÷ 0.03 = 33.3 months. Therefore LTV = $120 × 33.3 = $4,000. This figure is then compared against customer acquisition cost (CAC) to produce an LTV:CAC ratio; acquirers typically want ratios above 3:1 before issuing an LOI.

Adjusting for Expansion Revenue

Many SaaS products see upsells and seat expansions. Add the expansion MRR uplift to ARPU before dividing by churn. If the same customer base adds 15 % expansion revenue, effective ARPU rises to $172.50 and LTV climbs to roughly $4,600.

Common Calculation Mistakes

  • Using annual churn instead of monthly churn when the business has high intra-year turnover, which inflates LTV by 20–40 %.
  • Ignoring cohort-based churn; averaging all customers together masks that users acquired via paid ads often churn 2× faster than organic sign-ups.
  • Applying a single gross-margin figure across all plans when enterprise contracts carry 10–15 % higher support costs.
  • Excluding refunds and payment failures, which can reduce realized LTV by 8–12 % on platforms like MicroAcquire.

Using LTV in 2026 Valuations

Buyers on FE International and hades.ae now apply LTV multiples directly to ARR when EBITDA is thin. A company with $40k MRR, 4 % churn, and $4,800 blended LTV typically trades at 3.2–3.8× ARR, provided churn stays below 5 % and net revenue retention exceeds 110 %. Sellers who present cohort-level LTV:CAC tables usually close at 0.5× higher multiples than those using only headline ARR.

Escrow and Warranty Considerations

During due diligence, acquirers place 15–20 % of the purchase price in escrow for 12 months. If post-acquisition churn rises above the level used in the LTV model, part of the escrow may be clawed back. Accurate historical LTV therefore protects both seller and buyer from post-close adjustments.

Question

What is a healthy LTV:CAC ratio for SaaS in 2026?

Answer

Most acquirers require at least 3:1; top-quartile companies on Acquire.com show ratios between 4:1 and 5:1.

Question

Should I use gross or net revenue retention in LTV?

Answer

Use gross retention for baseline LTV; layer net retention on top only when calculating expansion-adjusted LTV for valuation models.

Question

How often should LTV be recalculated?

Answer

Recalculate monthly using the latest 90-day cohort data; quarterly updates are acceptable only for businesses under $20k MRR.

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