Monthly Recurring Revenue

What it measures

The sum of every active recurring subscription's normalized monthly value at a point in time. One-time setup fees, professional services, and usage overages are excluded — only revenue you can reliably expect to repeat each month from standing contracts.

Why it matters

MRR is the heartbeat of a subscription business. You use it to know whether the company is growing month over month and by how much. Investors use it to value the business, because recurring revenue is predictable and far more valuable than one-time sales. Almost every other SaaS metric (ARR, NRR, Net New MRR) is built on top of it.

How to read it

Read MRR as a trend over time, never as a single snapshot. Always compare this month to the prior month and to your plan or forecast. Month-over-month growth > 0% means new and upsell revenue are outrunning downsells and churn; flat or negative growth means the leaks are larger than the inflows. Always break MRR into its five components to diagnose *why* it moved — two companies with the same $100K ending MRR could have radically different trajectories if one is growing fast and the other shrinking.

What good looks like

Watch-outs

• Counting non-recurring fees as MRR. Setup fees, annual price hikes, professional services revenue, and usage overages are not MRR — including them distorts the real subscription run-rate and breaks month-to-month comparability.
• Booking annual contracts as lump sums. A 12-month, $12K deal is $1K/month of MRR, not $12K — always normalize to the monthly equivalent or your MRR will spike on signing and vanish at renewal.
• Ignoring the waterfall components. Flat total MRR can mask a crisis — you could have $15K new and $15K churn, meaning your customer base is completely unstable. Always read the five components.
• Double-counting in amendments. If a customer upgrades mid-month, include only the new incremental MRR starting that date, not a full month of both old and new — avoid the cliff.

Worked example