#949 · Startup Tool

Series A MRR Calculator

Calculate monthly recurring revenue for a Series A SaaS company using starting MRR, new MRR, expansion, contraction, and churn. Use it to evaluate growth quality before fundraising.

Calculator

MRR movement inputs
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How to use this calculator

  1. Enter starting MRR at the beginning of the month.
  2. Add new MRR from new customers.
  3. Add expansion MRR from upgrades or more seats.
  4. Subtract churned and contracted MRR.

What the result means

Series A investors care about both total MRR and MRR movement quality. Strong net new MRR with low churn and meaningful expansion is healthier than growth driven only by new acquisition.

Ending MRR = Starting MRR + New MRR + Expansion MRR − Churned and contraction MRR.

Exclude one-time setup fees and services revenue from MRR. Use only recurring subscription revenue.

Example calculation

Starting MRR of $200,000 plus $40,000 new MRR and $15,000 expansion, minus $12,000 churn, gives ending MRR of $243,000.

Tips for better results

  • Separate new, expansion, contraction, and churned MRR.
  • Improve expansion revenue through seat growth and upgrades.
  • Track net revenue retention alongside MRR growth.
  • Do not include implementation fees in MRR.

FAQ

How do I calculate MRR for a Series A SaaS startup?

Start with beginning MRR, add new and expansion MRR, then subtract churned and contraction MRR.

What MRR growth rate is strong for Series A fundraising?

Strong Series A SaaS companies often show consistent double-digit monthly growth or a credible path to rapid annual growth.

Should one-time revenue be included in MRR?

No. MRR should include recurring subscription revenue only, not setup fees, consulting, or one-time payments.

What is net new MRR in SaaS metrics?

Net new MRR equals new MRR plus expansion MRR minus churned and contraction MRR.

Why do investors look at expansion MRR before Series A?

Expansion MRR indicates customers are growing in value, which supports retention, LTV, and efficient revenue growth.

Startup decision table

MetricMeaning
Ending MRRRecurring revenue after monthly movements
Net New MRRNew plus expansion minus lost MRR
Growth HealthGrowth quality based on churn and expansion

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