SaaS Metrics Calculator
Results are estimates based on the values you enter. Recheck your inputs and assumptions before using the output for decisions.
Review a simple SaaS operating snapshot with MRR, ARR, churned MRR, CAC, lifetime value, and LTV to CAC ratio.
SaaS Metrics Calculator
Free online SaaS metrics calculator to review the core operating numbers of a subscription business in one place. This calculator is useful for SaaS founders, finance teams, product operators, growth managers, investors, and subscription analysts who want a quick way to connect customer count, pricing, churn, acquisition spending, and unit economics. Instead of looking at each metric separately, this page brings several of the most important SaaS measures together so you can see how the business model behaves as a system.
This calculator uses six inputs: active customers, monthly ARPU, gross margin, monthly churn, monthly marketing spend, and new customers added during the month. From those values it estimates monthly recurring revenue, annual recurring revenue, churned MRR, customer acquisition cost, SaaS lifetime value, and the LTV to CAC ratio. These are some of the most common metrics used in SaaS dashboards because they help answer practical questions about growth quality. Are customers valuable enough to justify acquisition cost? Is churn eating too much recurring revenue? Is the revenue base large enough relative to the team and spending level? This page helps turn those questions into a simple numerical snapshot.
The formula of SaaS metrics
MRR = Active customers x Monthly ARPU
ARR = MRR x 12
Churned MRR = MRR x Monthly churn rate
CAC = Monthly marketing spend / New customers
Monthly gross profit per customer = Monthly ARPU x Gross margin
SaaS lifetime value = Monthly gross profit per customer / Monthly churn rate
LTV to CAC ratio = SaaS lifetime value / CAC
Here active customers means current paying customers, monthly ARPU means average revenue per user per month, gross margin means the share of revenue left after direct delivery cost, monthly churn rate means the percentage of customers lost each month written as a decimal in the formula, CAC means customer acquisition cost, and LTV to CAC ratio compares customer value with acquisition cost.
Solved Example
Example 1: Find the core SaaS metrics if active customers are 500, monthly ARPU is $120, gross margin is 80%, monthly churn is 5%, monthly marketing spend is $12,000, and new customers are 40.
Solve: MRR = 500 x 120 = $60,000
ARR = 60000 x 12 = $720,000
Churned MRR = 60000 x 0.05 = $3,000
CAC = 12000 / 40 = $300
Monthly gross profit per customer = 120 x 0.80 = $96
SaaS lifetime value = 96 / 0.05 = $1,920
LTV to CAC ratio = 1920 / 300 = 6.40
Example 2: Find the result if active customers are 1,200, monthly ARPU is $90, gross margin is 75%, monthly churn is 4%, marketing spend is $18,000, and new customers are 60.
Solve: MRR = 1200 x 90 = $108,000
ARR = 108000 x 12 = $1,296,000
Churned MRR = 108000 x 0.04 = $4,320
CAC = 18000 / 60 = $300
SaaS lifetime value = (90 x 0.75) / 0.04 = 67.5 / 0.04 = $1,687.50
LTV to CAC ratio = 1687.50 / 300 = 5.63
Example 3: Find the result if active customers are 300, monthly ARPU is $250, gross margin is 85%, monthly churn is 3%, marketing spend is $15,000, and new customers are 20.
Solve: MRR = 300 x 250 = $75,000
ARR = 75000 x 12 = $900,000
Churned MRR = 75000 x 0.03 = $2,250
CAC = 15000 / 20 = $750
SaaS lifetime value = (250 x 0.85) / 0.03 = 212.5 / 0.03 = $7,083.33
LTV to CAC ratio = 7083.33 / 750 = 9.44
Table of SaaS metrics calculator
| Customers | ARPU | MRR | CAC | SaaS LTV | LTV:CAC |
|---|---|---|---|---|---|
| 300 | $250 | $75,000 | $750 | $7,083.33 | 9.44 |
| 500 | $120 | $60,000 | $300 | $1,920 | 6.40 |
| 1,200 | $90 | $108,000 | $300 | $1,687.50 | 5.63 |
| 2,000 | $150 | $300,000 | $400 | $3,750 | 9.38 |
How to use this SaaS metrics calculator
Enter the current number of active customers in the proper input field. After that, enter monthly ARPU, gross margin percentage, monthly churn percentage, monthly marketing spend, and the number of new customers acquired during the same month. Then click the calculate button. The calculator will show MRR, ARR, churned MRR, CAC, SaaS lifetime value, and LTV to CAC ratio in the result box.
This calculator is useful when reviewing monthly subscription performance and deciding where to focus improvement. If churn falls, LTV usually rises. If ARPU rises while churn stays stable, both MRR and LTV improve. If CAC climbs faster than LTV, acquisition efficiency weakens. Looking at these metrics together helps prevent bad decisions based on one isolated number. A company can have strong MRR growth and still have unhealthy unit economics if churn is high or CAC is too expensive.
When using the result, remember that this is a simplified SaaS snapshot. Real subscription businesses may need cohort-based analysis, expansion revenue, net revenue retention, sales-assisted CAC, onboarding cost, plan mix, annual contracts, and segment-level churn. Even so, these six outputs provide a strong starting dashboard for many recurring-revenue businesses. This calculator gives a fast numerical view that supports board reporting, growth analysis, pricing review, acquisition decisions, and subscription planning.