SaaS Metrics Calculator (MRR, ARR, LTV, CAC & Break-Even)

Compute MRR, ARR, gross-margin LTV, LTV:CAC ratio, CAC payback months, and break-even customer count.

Monthly & Annual Recurring Revenue
USD 54,000.00 MRR
ARR: USD 648,000.00/yr • LTV:CAC Ratio: 4.27×
Customer Lifetime Value (LTV) USD 3,840.00
LTV : CAC Ratio 4.27 : 1
CAC Payback Period 9.4 months
Break-Even Customer Count 261 customers
Inputs
Amounts are treated in the selected currency; no foreign-exchange conversion is applied.
customers
Current number of active subscription accounts.
USD / mo
Average monthly subscription revenue per customer.
%
Revenue remaining after hosting, support, and third-party API COGS.
% / mo
Percentage of customers cancelling each month.
USD ($)
Fully loaded sales & marketing spend per new customer acquired.
USD / mo
Monthly R&D and G&A fixed overhead for break-even calculation.
Results & Graph
Monthly & Annual Recurring Revenue
USD 54,000.00 MRR
ARR: USD 648,000.00/yr • LTV:CAC Ratio: 4.27×
Customer Lifetime Value (LTV)
USD 3,840.00
40 mo avg lifespan
LTV : CAC Ratio
4.27 : 1
Healthy (≥ 3.0× benchmark)
CAC Payback Period
9.4 months
Gross profit USD 96.00/mo/cust
Break-Even Customer Count
261 customers
To cover USD 25,000.00/mo OpEx

Customer Unit Economics: CAC vs. Gross-Margin LTV

Comparison of upfront acquisition cost against lifetime gross profit per customer
Graph 1 • Customer Unit Economics: CAC vs. Gross-Margin LTV Comparison of upfront acquisition cost against lifetime gross profit per customer
Customer Acquisition Cost (CAC): USD 900.00Customer Lifetime Value (LTV): USD 3,840.00 Customer Acquisition Cost (CAC) USD 900.00 Customer Lifetime Value (LTV) USD 3,840.00
Graph 2 • Revenue vs. Cost / Overhead Share Ring Proportional unit economics composition
TOTAL USD 4,700.00 Customer Acquisition Cost (CAC) 900 (19.0%) Customer Lifetime Value (LTV) 3.8k (81.0%)
Graph 3 • Monthly Net App Revenue Across Active User (DAU) Multipliers Shows how rates or revenues scale with utilization and volume
0 7.7k 15.4k 0.5× DAU: 2,370 2.4k 0.5× DAU 1× DAU: 4,740 4.7k 1× DAU 1.5× DAU: 7,110 7.1k 1.5× DAU 2× DAU: 9,480 9.5k 2× DAU 3× DAU: 14,220 14.2k 3× DAU
Summary: Customer Acquisition Cost is USD 900.00 and Customer Lifetime Value is USD 3,840.00.
Summary: With 450 customers paying USD 120.00/month at a 80% gross margin and 2.5% monthly churn, your business generates USD 54,000.00 MRR (USD 648,000.00 ARR). Each customer yields USD 3,840.00 in gross-margin LTV against a USD 900.00 CAC (4.27× LTV:CAC, recovering CAC in 9.4 months).
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Interactive chart & math engine powered by CalculatorGraph

Formula & Mathematical Methodology: Gross-Margin Adjusted SaaS Unit Economics Formulas

MRR = Ncust × ARPU,   LTV = ARPU × Gross MarginMonthly Churn,   Payback = CACARPU × Gross Margin
MRR = Customers × ARPU; LTV = (ARPU × GrossMargin) / MonthlyChurn; Payback (mo) = CAC / (ARPU × GrossMargin)
  • ARPU: Average monthly recurring revenue per active customer
  • GrossMargin: 1 − (COGS ÷ Revenue)
  • MonthlyChurn: Monthly logo/revenue churn rate as a decimal

Rounding: Currency values round to nearest dollar; ratios and months round to 1–2 decimal places.

Worked Example: 450 Customers at $120 ARPU, 80% Gross Margin, 2.5% Monthly Churn, $900 CAC

Analyze a B2B SaaS business with 450 customers paying $120/mo.

  1. MRR = 450 × $120 = $54,000/month (ARR = $648,000/year).
  2. Monthly gross profit per customer = $120 × 0.80 = $96.00.
  3. LTV = $96.00 ÷ 0.025 = $3,840 (40-month average customer lifespan).
  4. LTV:CAC = $3,840 ÷ $900 = 4.27×; CAC Payback = $900 ÷ $96 = 9.38 months.
Result: $54,000 MRR ($648,000 ARR), $3,840 LTV, 4.27× LTV:CAC, and 9.4-month payback.

Frequently Asked Questions

Why should LTV include Gross Margin instead of raw ARPU?

Using raw revenue overstates how much cash a customer contributes toward recovering CAC. If your gross margin is 75%, 25% of every dollar is consumed by infrastructure and support COGS.

Business & Marketing · SaaS & Subscription Unit Economics

SaaS Metrics Calculator (MRR, ARR, LTV, CAC & Break-Even): inputs, method, and how to read the result

Compute MRR, ARR, gross-margin LTV, LTV:CAC ratio, CAC payback months, and break-even customer count.

Choose inputs for the case you are checking

The defaults are illustrative. Replace them with values for your case and keep the units shown beside each field.

  • Display Currency: Amounts are treated in the selected currency; no foreign-exchange conversion is applied.
  • Active Paying Customers: Current number of active subscription accounts.
  • Average Revenue Per User (ARPU): Average monthly subscription revenue per customer.
  • Subscription Gross Margin: Revenue remaining after hosting, support, and third-party API COGS.

What the calculation includes

With the default values shown, Monthly & Annual Recurring Revenue is USD 54,000.00 MRR. The calculation follows Gross-Margin Adjusted SaaS Unit Economics Formulas; the formula and variable definitions above show how the inputs combine.

One-input check: With the other defaults held constant, changing Active Paying Customers from 450 customers to 495 customers changes Monthly & Annual Recurring Revenue from USD 54,000.00 MRR to USD 59,400.00 MRR. This is a comparison inside the calculator's stated model, not a prediction.

Where to use caution

  • Weights LTV by gross margin rather than top-line revenue so hosting and AI inference COGS are properly accounted for.
  • Assumes constant exponential decay churn rather than cohort-specific retention curves or net dollar expansion.

Scope: Global Check the assumptions and limitations against your situation before relying on the estimate.

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