LTV / CAC Calculator — PGX Consulting Web Tools

Inputs

Currency

ARPU (monthly revenue per user)

Gross margin %

Monthly churn %

CAC (acquisition cost per customer)

Discount rate % (optional) If set, we show LTV (discounted) using a simple perpetuity with churn.

Monthly Contribution

—

ARPU × margin

LTV

—

≈ (Contribution ÷ churn)

LTV (discounted)

—

optional, if discount % set

LTV : CAC

—

Rule of thumb ≥ 3 is strong

Payback Period

—

months (≈ CAC ÷ contribution)

—

Notes & Tips

LTV ≈ (ARPU × margin) ÷ monthly churn. Payback ≈ CAC ÷ monthly contribution.

Simple SaaS-style model with constant churn and margin. Discounted LTV uses a perpetuity with churn + discount.

Common heuristics: LTV:CAC ≥ 3; payback < 12 months is healthy for SMB SaaS (varies by market).

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