SaaS revenue metrics that matter before you scale

Quick answer

A practical checklist of SaaS revenue metrics for founders: MRR, ARR, net new MRR, churn, expansion, CAC, LTV, payback and runway.

Core formulas

Net new MRR

Net new MRR = new MRR + expansion MRR - contraction MRR - churned MRR

This is the cleanest monthly view of recurring revenue movement.

Gross revenue retention

GRR = (starting MRR - contraction MRR - churned MRR) / starting MRR

GRR excludes expansion so retention problems are easier to see.

CAC payback

CAC payback = CAC / monthly gross profit per customer

A shorter payback period reduces cash risk.

Worked example

Metric stack for a small SaaS team

The company starts with $30,000 MRR.
It adds $4,000 new MRR, $1,000 expansion MRR, $500 contraction MRR and $1,500 churned MRR.
Average CAC is $480 and monthly gross profit per customer is $80.

Net new MRR is $3,000, ending MRR is $33,000, gross revenue retention is 93.3%, and CAC payback is 6 months.

Revenue movement metrics

Start with MRR, ARR and net new MRR. These metrics explain whether the recurring revenue base is expanding. The important part is not just the final number, but the mix of new, expansion, contraction and churned revenue underneath it.

MRR: normalized monthly recurring revenue.
ARR: annualized recurring revenue run rate.
Net new MRR: the amount of recurring revenue added after losses.

Retention metrics

Retention tells you whether growth is durable. Churn rate, revenue churn, gross revenue retention and expansion MRR should be reviewed before increasing acquisition spend. If customers leave quickly, paid growth can hide a weak product for a while, then become expensive.

Efficiency and cash metrics

CAC, LTV, CAC payback and runway connect growth with financial reality. A SaaS company can show attractive MRR growth while still burning cash too quickly. The goal is to understand how much each customer costs, how long value takes to recover, and whether the current cash position can support the plan.

Use the calculators

FAQ

What is the most important SaaS revenue metric?

For early planning, net new MRR is one of the most useful because it captures acquisition, expansion, contraction and churn in one movement view.

Should I track all metrics from day one?

Track a small set consistently: MRR, new MRR, churned MRR, CAC, gross margin and runway. Add more detail as the business matures.

Why include cash runway with SaaS revenue metrics?

Revenue can grow while cash tightens. Runway keeps the growth plan grounded in actual operating capacity.