Gross MRR churn: what gross revenue churn is and how to calculate it

Gross MRR churn measures how much recurring revenue a company loses in a period because of customers who cancel or move to a smaller plan. The word gross is the key: the calculation adds up only what left and completely ignores any expansion, upsell or reactivation. That is why it is always positive and never exceeds 100%, since at most you lose the entire base you started with.

While generic churn can refer to customers who disappear, gross MRR churn is a revenue reading: it speaks in dollars of MRR that evaporated, not in number of logos. That makes it the most honest picture of the money leaking out, the worst case before counting any gain.

The formula takes all the recurring revenue lost in the period and divides it by the base at the start of that same period.

• Gross MRR churn = (MRR from cancellations + MRR from downgrades) / MRR at the start of the period.
• The numerator holds only losses: cancelled contracts and plan downgrades.
• The denominator holds the MRR on the first day of the period, before any movement.

Example: you start the month with $100k of MRR, lose $4k to cancellations and $1k to downgrades. Gross MRR churn is 5%, even if expansion added $8k in the same month. Expansion does not enter the gross figure, it only shows up in the net calculation.

The difference between gross and net comes down to a single variable: expansion. Gross MRR churn ignores every gain from the existing base. Net MRR churn subtracts expansion revenue (upgrades, upsell, cross-sell) from the losses before dividing.

• Gross MRR churn: losses only. Always positive, capped at 100%.
• Net MRR churn: losses minus expansion. Can go negative when expansion beats losses, the famous negative churn.

Looking at net alone hides a common problem: a base that loses a lot but masks it with aggressive upsell on a few accounts. That is why gross and net travel together. Gross reveals the real size of the leak; net shows whether growth in the base covers that leak.

When someone asks about the three types of churn, they usually mean three different lenses on the same loss. Understanding all three keeps you from mistaking context for a number.

• Customer churn: how many logos you lost, in units. It does not weigh the size of each account.
• Gross revenue churn: how much MRR left, with no expansion subtracted. This is the gross MRR churn of this entry.
• Net revenue churn: MRR losses already netted against expansion of the base.

A SaaS can have high customer churn and low gross revenue churn if the accounts leaving are small, or the reverse. Reading all three together avoids hasty conclusions about the health of retention.

There is no magic number, but there is a ruler. A rule of thumb repeated across the industry is to keep monthly gross MRR churn around 1% or below, which compounds to somewhere between 10% and 12% a year. Selling to larger companies tends to yield lower churn than selling to SMBs, which rotate faster.

The SaaS Capital research on private SaaS retention shows that healthy companies keep the large majority of their recurring revenue year over year, and that those serving larger accounts tend to lose less. Gross MRR churn is the other side of that coin: the lower it is, the more revenue survives the period.

Gross MRR churn is the direct mirror of Gross Revenue Retention (GRR): over a period, GRR and gross churn add up to 100%. If you retain 92% of revenue, your gross churn was 8%. That is why it is the metric customer success and product teams watch to know whether the leak is under control before any expansion effort.

It also gives context to the rest of the funnel. There is no point speeding up acquisition if the base drains through the same hole, and it is in MRR movements that this tug of war between loss and gain becomes visible. The annual private SaaS survey by KeyBanc Capital Markets reinforces that retention is the engine of efficient growth, with the net retention of the best companies above 100%. Controlling gross churn is the first step to getting there.