Calculate all core SaaS metrics — MRR, ARR, ARPU, customer lifetime, LTV, churn impact, and LTV:CAC — in one place.
How much LTV could you unlock by reducing churn? (Based on your current ARPU)
| Churn Rate | Lifetime (mo) | LTV | vs Current |
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This subscription metrics calculator turns four simple inputs — your MRR, active customer count, monthly churn rate, and customer acquisition cost — into the full picture of a recurring-revenue business: MRR, ARR, ARPU, customer lifetime, LTV, the LTV:CAC ratio, payback period, and monthly customer loss.
Instead of juggling spreadsheet formulas, you can see how each metric moves the moment you change an input, and the churn-impact table shows exactly how much lifetime value you could unlock by lowering churn. People use it to:
Everything runs locally and in-browser — your revenue, customer, and CAC numbers never leave your device, there's no sign-up, and nothing is stored on a server.
MRR (Monthly Recurring Revenue) is the predictable revenue your business earns each month from active subscriptions. ARR (Annual Recurring Revenue) is simply MRR × 12. ARR is the standard metric for annual planning, fundraising conversations, and benchmarking against other SaaS companies.
This tool uses LTV = ARPU ÷ Monthly Churn Rate, where ARPU is MRR ÷ Customers. For example, with ARPU of $250 and 2% monthly churn, LTV = $250 ÷ 0.02 = $12,500. It assumes constant ARPU and is a simplified model — expansion and contraction revenue will shift the real figure.
Monthly churn rate is the percentage of customers who cancel each month. For B2B SaaS, monthly churn below 1% (under ~12% annually) is healthy, and best-in-class is 0.5% or less. B2C typically tolerates 2–3%. Above 3% monthly churn is a serious retention problem that will stunt growth.
An LTV:CAC ratio above 3 is the industry benchmark for a healthy SaaS business — you earn $3 or more in lifetime value for every $1 spent acquiring a customer. Below 1 means you're losing money on each customer, 1–3 is marginal, and above 5 may indicate you're under-investing in growth.
Gross revenue churn counts only revenue lost to cancellations and downgrades. Net revenue churn subtracts expansion revenue (upsells and seat growth) from those losses, so it can be negative when expansion outpaces losses — that's "negative net churn," a strong growth signal. This calculator models gross customer churn for lifetime and LTV.
ARPU (Average Revenue Per User) is MRR ÷ Number of Customers — the average monthly revenue each customer contributes. Rising ARPU from upsells and expansion is a positive signal, while falling ARPU can indicate a shift toward lower-tier plans or a changing customer mix. ARPU is the basis for the LTV calculation.
Together MRR, ARR, ARPU, churn, LTV, and the LTV:CAC ratio describe whether your recurring-revenue engine is sustainable. They reveal how fast revenue compounds, how long customers stay, whether acquisition spend pays back, and where to invest — making them the core KPIs investors and operators track for SaaS health.