Churned Monthly Recurring Revenue

What it measures

The total prior-month MRR of every customer whose contract fully ended and whose recurring balance dropped to zero during the period. Partial downgrades that leave a customer paying something are excluded — those belong to Downsell MRR. Only full logo loss counts here, reported as a positive magnitude that is subtracted in the MRR waterfall.

Why it matters

Churned MRR is the leak in your bucket. Operators obsess over it because every dollar lost to cancellation is a dollar new sales must replace before the company grows at all — high churn means you are scaling acquisition just to stand still. Investors use it to stress-test unit economics: if you have a 30-month CAC payback and lose 10% of MRR a month, half your customers are gone before they ever pay back what you spent to win them. It is the single number that decides whether your growth engine compounds or treads water.

How to read it

Read churned MRR as a trend, in both absolute dollars and as a ratio to New MRR — that ratio tells you whether you're filling the bucket faster than it drains. Rising churn is a red flag; falling churn is a win. Always compare month-over-month and to plan, then ask why it moved: did one large account leave (concentration risk) or are you seeing broad, low-level erosion (a product or onboarding problem)? Break it by cohort — if new customers churn faster than mature ones, your activation is broken; if mature ones churn, you have a value-delivery problem.

What good looks like

Watch-outs

• Counting downgrades as churn. A customer moving from $10K to $5K loses $5K to downsell, not churn — only a full cancellation that drops MRR to $0 is churned MRR. Conflating the two inflates your churn rate.
• Including failed payments or paused trials. Churn counts contracts that genuinely ended; an involuntary payment failure that is later retried and recovered is not churn unless the customer actually cancels.
• Mishandling multi-year contracts. A customer paying $12K/year upfront carries $1K of MRR every month and churns once at non-renewal — count that full monthly MRR in the period they leave, not a one-time cash figure.
• Reading only logo churn or only MRR churn. Losing 5% of customers might be 20% of MRR if a whale leaves — always measure both dollars lost and logos lost.

Worked example