Forecast SaaS Churn & LTV
Interactive MRR, user churn, revenue churn, ARPU, customer lifetime value (LTV), and CAC payback period calculator.
SaaS & Subscription Churn Calculator
Calculate MRR retention, Net Revenue Retention (NRR), LTV, and CAC Payback periods.
| Timeline | Active Customers | Projected MRR ($) |
|---|---|---|
| Month 1 | 515 | $52,485 |
| Month 2 | 530 | $55,470 |
| Month 3 | 544 | $58,356 |
| Month 4 | 558 | $61,242 |
| Month 5 | 571 | $64,029 |
| Month 6 | 584 | $66,816 |
| Month 7 | 596 | $69,504 |
| Month 8 | 608 | $72,192 |
| Month 9 | 620 | $74,880 |
| Month 10 | 631 | $77,469 |
| Month 11 | 642 | $80,058 |
| Month 12 | 653 | $82,647 |
SaaS Unit Economics & Revenue Churn Analytics: Modeling MRR Retention & Lifetime Value
For subscription and SaaS businesses, customer retention is the single primary compounding driver of valuation and growth. A 5% monthly logo churn rate compounds to over 45% annual customer loss, eroding marketing investments. This interactive SaaS metrics calculator computes Logo Churn, Net Revenue Churn, Monthly Recurring Revenue (MRR), Customer Lifetime Value (LTV), and CAC Payback Periods.
SaaS Benchmark Health Standards
| Specification | Pattern / Benchmark | Why It Matters |
|---|---|---|
| Net Revenue Retention (NRR) | Good: 100% – 110% | Top Tier: 120%+ | Indicates account expansion offsets cancelations without relying on new acquisition. |
| Logo Churn Rate | SMB: < 3% Monthly | Enterprise: < 1% Monthly | SMB SaaS naturally experiences higher churn than annual contract enterprise software. |
| LTV to CAC Ratio | Target Benchmark: 3.0x or Higher | Ratios below 3.0x signal inefficient acquisition spending or poor retention. |
| CAC Payback Period | < 12 Months | The number of months required to recoup the sales & marketing cost to acquire 1 user. |
The Mathematics of SaaS Retention: Logo Churn vs Net Revenue Retention (NRR)
Logo Churn calculates customer count attrition: Logo Churn % = (Customers Lost / Start Customers) * 100. However, in B2B SaaS, NRR (Net Revenue Retention) is the dominant investor metric.
Net Revenue Churn % = [(Churned MRR + Contraction MRR - Expansion MRR) / Starting MRR] * 100. If expansion revenue from existing accounts exceeds churned revenue, Net Churn becomes negative—achieving the holy grail of SaaS unit economics: Negative Churn.
Subscription Unit Economics Included
Dual-Layer Churn Analysis
Calculates both Logo Churn % (customer count loss) and Net Revenue Churn % (MRR loss minus expansion upgrades).
Customer Lifetime Value (LTV) Formula
Computes true LTV based on Average Revenue Per Account (ARPU), gross margin percentage, and churn velocity.
12-Month MRR Growth Forecasting
Models 12-month compound MRR trajectories accounting for churn leakage vs acquisition growth.
LTV to CAC Ratio & Payback Audit
Evaluates SaaS health benchmarks (aiming for 3x+ LTV:CAC and <12 months CAC payback duration).
Evaluating Retention & Payback Health
Input Active Customer Count & Churn
Enter your start-of-month active subscribers and lost customers during the 30-day window.
Define Financial Metrics
Specify Monthly Recurring Revenue (MRR), Average Revenue Per User (ARPU), and Expansion MRR.
Set Customer Acquisition Cost (CAC)
Enter your average sales and marketing spend per acquired customer.
Analyze Unit Economics & Export
Review your 12-month growth projection model, net retention score, and download a CSV financial summary.
SaaS Metrics & Churn FAQ
Common workflow details and troubleshooting notes for SaaS & Subscription Churn Calculator.