SaaS & Subscription Profitability Calculator
Analyze MRR, ARR, margin-adjusted Customer Lifetime Value (LTV), LTV:CAC, and payback period. Model the core unit economics of your subscription business. Evaluate MRR, annualized run rate (ARR), gross-margin adjusted customer lifetime value, customer acquisition cost payback, and subscriber churn sensitivity.
Subscriber Scale & Revenue
Acquisition Efficiency & Customer Churn
The golden benchmark for sustainable venture and bootstrapped SaaS growth. Strong unit economics with dependable margin.
| Churn | Lifetime | Adj LTV | 12M ARR Δ |
|---|---|---|---|
| 1% | 100m | $12,218 | +$137,751.24 |
| 2% | 50m | $6,109 | +$65,604.08 |
| 3% | 33.3m | $4,072.67 | +$0 |
| 4% | 25m | $3,054.5 | -$59,644.31 |
| 5% | 20m | $2,443.6 | -$113,863.38 |
Official Calculation Summary
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How This Calculation Works: Formulas & Technical Assumptions
Variables & Term Definitions
- MRR & ARR:Monthly Recurring Revenue is normalized subscription revenue generated in a single month. ARR is annualized run-rate (MRR × 12), representing run-rate pace, not guaranteed cash.
- Gross-Margin Adjusted LTV:The actual gross profit cash delivered by a customer across their entire lifetime. Unadjusted LTV (ARPU / Churn) ignores hosting, software, and support costs and dangerously overstates unit economics.
- CAC Payback Period:The exact number of months required for a subscriber’s gross margin payments to pay back the sales and marketing spend used to acquire them.
- LTV : CAC Health Benchmark:SaaS industry standard ratio: 3.0x to 5.0x represents healthy venture and bootstrapped unit economics.
Underlying Mathematical Assumptions
- Constant linear churn is assumed: the probability of a customer cancelling in any given month is modeled as uniform across cohorts.
- Gross Margin accounts for direct hosting (AWS/GCP), third-party API costs, customer support, and payment transaction fees.
- ARR is strictly defined as an annualized run rate rather than contracted multi-year revenue.
Step-by-Step Worked Example: B2B Project Management Software with $149/mo ARPU
A growing SaaS company has 250 active paying organizations paying $149/month. Their blended CAC is $900 across Google Search and outbound sales. Monthly subscriber churn is 3.0%, and software gross margin is 82.0%.
The company is operating at a $447k annual run rate.
At 3% monthly churn, an average customer remains subscribed for nearly 3 years.
Each new customer delivers $4,072.67 in net gross margin over their lifespan.
At 4.53x, the company is firmly inside the prime 3x–5x healthy SaaS benchmark.
The company recovers its acquisition investment in under 8 months.
Practical Guidance & Real-World Limitations
Real operating environments introduce nuanced variables that should be considered alongside mathematical models:
Negative net churn / Expansion revenue: In mature enterprise SaaS, existing accounts upgrade and expand (seat expansion, usage tiers), creating net negative revenue churn that exceeds initial contract value.
Early cohort curve flattening: In reality, churn is rarely uniform; customers who survive month 3 often have significantly higher retention than month-1 cohorts.
Blended vs Paid CAC: Blending organic word-of-mouth signups with paid advertising creates an artificially low CAC that masks unprofitable paid ad channels.
Frequently Asked Questions
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