A practical reference from 4NLab
SaaS metrics, explained and calculated
Know what your SaaS numbers mean.
Work through the calculation, check its assumptions, and understand what the result can tell you. 23 practical guides, 17 free calculators, and 91 glossary definitions.
Explore the glossary →Two tools for your own numbers
Choose the SaaS metrics to track
Describe your company in a sentence or two; get the five or six metrics that matter for your stage, with the reason for each.
Check your metric definition
Paste how your team calculates MRR, churn, NRR or CAC; see common definition mistakes flagged, with links to the method.
Start with the question you need to answer
Understand recurring revenue
Normalize monthly and annual contracts, distinguish run rate from recognized revenue, and reconcile changes in customer spend.
Find what retention is hiding
Separate customer departures, lost recurring revenue, and expansion. Follow the same cohort through each calculation.
Test acquisition economics
Choose consistent cost and customer cohorts, account for gross margin, and examine the assumptions behind estimated lifetime value.
Plan cash and growth
Connect available cash to burn, examine sales efficiency, and compare growth with a clearly defined profitability measure.
Resolve a common mix-up
Calculate with your numbers
ARR Calculator
ARR expresses the current recurring subscription base on an annual scale.
Burn Multiple Calculator
Burn multiple connects cash consumed with the increase in recurring revenue over the same period.
CAC Calculator
CAC turns acquisition spending into a cost per new paying account.
CAC Payback Period Calculator
CAC payback estimates how long a customer’s gross profit contribution takes to recover acquisition cost.
Customer Churn Calculator
Customer churn counts accounts lost from a defined starting customer base.
Free Cash Flow Calculator
Free cash flow summarizes operating cash remaining after capital expenditures.
GRR Calculator
Gross revenue retention isolates losses from an existing revenue base.
LTV Calculator
LTV is an estimate whose usefulness depends on the model behind it.
LTV to CAC Ratio Calculator
LTV/CAC compares modeled customer value with acquisition cost.
MRR Calculator
Use MRR to explain the recurring revenue base at a specific date.
NRR Calculator
Net revenue retention follows a starting group of customers and asks how their recurring revenue changed.
Revenue Multiple Calculator
A revenue multiple is meaningful only when both the value numerator and revenue denominator are identified.
Rule of 40 Calculator
The Rule of 40 adds a revenue growth percentage to a profit margin percentage.
Runway Calculator
Runway is a cash planning estimate.
SaaS Magic Number Calculator
The SaaS Magic Number relates annualized quarterly revenue growth to the previous quarter’s sales and marketing expense.
TCV Calculator
TCV describes the value committed across a contract’s full term.
Valuation Calculator
The calculator on this site is a scenario tool: it multiplies ARR by a multiple you supply.
Make the assumptions visible
Each guide includes an original hypothetical scenario, pitfalls, and links to sources for the method. We explain where conventions differ and avoid treating a single benchmark as a universal target.