Numeros
Categories Financial Calculators Health Calculators Math Calculators Date & Time Construction Engineering Physics Business Education Lifestyle Converters Generators
About

SaaS Metrics Calculator

By

Enter your customers, pricing, spend, and cash position to find MRR, ARR, churn, CAC, LTV, and runway - all in one place.

SaaS Metrics Calculator

Live
MRR (Monthly Recurring Revenue)$25,000
ARR (Annual Recurring Revenue)$300,000
Churn rate3.0%
CAC (Customer Acquisition Cost)$250.00
LTV (Lifetime Value, estimated)$1,666.67
LTV:CAC ratio6.67 : 1
Runway12.0 months
LTV here is a simplified estimate (price / churn rate) - runway assumes today's burn rate stays constant. Both shift as the business changes.

The formulas

MRR = Active customers x Average price per customer ARR = MRR x 12 Churn rate = Customers lost / Active customers CAC = Sales & marketing spend / New customers acquired LTV (simplified) = Average price / Churn rate Runway = Cash in the bank / Monthly cash burn
Example

500 customers at $50/month, 3% churn: LTV = 50/0.03 = $1,666.67. Spending $50,000 to acquire 200 customers: CAC = $250. LTV:CAC = 6.67:1 - generally considered a healthy ratio.

Step-by-step guide

  1. Enter your active customer count and average price per customer per month.
  2. Enter customers lost this month to see your churn rate.
  3. Enter your sales & marketing spend and new customers acquired to see CAC and the LTV:CAC ratio.
  4. Enter your monthly cash burn and current cash balance to see your runway.

Why LTV:CAC is the ratio investors actually look at

CAC and LTV individually only tell half the story each - a low CAC means nothing if customers churn out before they're profitable, and a high LTV means nothing if it costs more than that to acquire each customer in the first place. The ratio between them is what reveals whether the underlying business model actually works: a commonly cited healthy benchmark is 3:1 or higher, meaning each customer is worth at least three times what it cost to acquire them. Below that, growth can become expensive to sustain even if revenue is increasing, since the company is spending nearly as much (or more) as customers are ultimately worth.

Common mistakes

Confusing "average price" with your highest or most common plan - true average price should reflect your full customer mix across all pricing tiers.
Leaving non-marketing costs (like sales team salaries) out of the CAC spend figure - a complete CAC should include all costs directly tied to acquiring customers, not advertising spend alone.

Frequently asked questions

What's considered a "good" churn rate?

It varies significantly by market - many B2B SaaS companies target under 1-2% monthly churn, while some consumer subscription products tolerate higher rates. Context (contract length, price point, customer type) matters more than a single universal benchmark.

Why is LTV calculated from churn rate instead of actual customer history?

This is a simplified, commonly used approximation (average revenue divided by churn rate) that works well for a quick estimate. More precise LTV models also factor in gross margin, expansion revenue, and cohort-specific retention curves.

Does MRR include one-time payments?

No - MRR specifically captures recurring subscription revenue. One-time setup fees, professional services, or single purchases are typically tracked separately from MRR.

Related calculators

See the full list of Business calculators, or try: