Business & SaaS

MRR Growth Calculator

Track Monthly Recurring Revenue growth and forecast future MRR.

MRR is the lifeblood metric of any subscription business. This calculator models MRR growth from new customers, expansion, contraction, and churn, giving you a complete picture of subscription revenue momentum.

Enter your numbers

Current MRR ($)

New MRR This Month ($)

Revenue from new customers acquired.

Expansion MRR ($)

Upgrades from existing customers.

Churned MRR ($)

Revenue lost from cancellations.

Results update as you change the inputs. Calculations run in your browser.

Next Month MRR

$28,100

net New M R R: +$3,100
growth Rate: 12.4%
arr: $337,200 ARR

See the formula

Formula and method

Next MRR = Current MRR + New MRR + Expansion MRR - Churned MRR

Standard SaaS MRR decomposition. Net new MRR is the sum of new business and expansion minus churn. Monthly growth rate divided by current MRR.

Worked examples

Early growth SaaS

Current MRR ($):: 15000
New MRR This Month ($):: 3000
Expansion MRR ($):: 500
Churned MRR ($):: 600

Next Month MRR: $17,900

Mature SaaS with churn problem

Current MRR ($):: 100000
New MRR This Month ($):: 8000
Expansion MRR ($):: 2000
Churned MRR ($):: 9000

Next Month MRR: $101,000

Assumptions and limits

No distinction between contraction and churn — all cancellation counted as churn

This tool provides an educational estimate. Rules, rates and personal circumstances can change the answer. Review the assumptions before relying on a result. Report a correction.

Common mistakes to avoid

Using total revenue instead of recurring revenue — one-time payments inflate MRR.
Ignoring contraction MRR (downgrades) — this is a separate category from churn.
Not tracking cohort churn — headline churn can hide a worsening trend in newer cohorts.

Frequently asked questions

What is net revenue retention (NRR)?

NRR measures how much revenue you retain from existing customers plus expansion, expressed as a percentage. NRR > 100% means your existing customer base is growing without new customers. Best-in-class SaaS companies achieve 120-130% NRR.

What MRR growth rate is good?

T2D3 is the classic benchmark for B2B SaaS: triple ARR in year 2, then double for the next 3 years. In practical terms, 15-20% monthly growth is exceptional early stage; 5-10% month-over-month is healthy growth-stage.