SaaS LTV/CAC Calculator
Unit economics from MRR, churn, gross margin & acquisition cost
Sample
Reset
Revenue
OFF
Retention
OFF
LTV
OFF
CAC
OFF
LTV:CAC
OFF
Revenue & Cost Inputs
Revenue & Margin
MRR per customer
$
Average monthly recurring revenue per customer (subscription, not one-off).
Gross margin (%)
%
Revenue left after COGS (hosting, support, payment fees). Typical SaaS: 70–85%.
Annual churn (%)
%
Percentage of customers lost per year. Or use monthly churn below instead.
Monthly churn (%)
— optional override
%
Leave blank to derive from annual churn. If set, it takes precedence.
Acquisition Cost
CAC — customer acquisition cost
$
Fully-loaded cost to acquire one paying customer (marketing + sales, amortized).
Calculate
Avg customer lifetime = 1 ÷ monthly churn. LTV = (MRR × gross margin) ÷ monthly churn = gross profit × lifetime. Payback = CAC ÷ (MRR × gross margin). LTV:CAC = LTV ÷ CAC.
Unit Economics
LTV
—
lifetime value
CAC
—
acquisition cost
LTV : CAC
—
Payback period
—
Avg customer lifetime
—
Payback period vs. 12-month target
0 mo
12 mo
24+ mo
OK
×
Inputs & Assumptions