NRR vs GRR: What's the Difference?
Written by Alex Raymond, founder of AMplify and author of The Growth Department.
The difference between Net Revenue Retention and Gross Revenue Retention is expansion revenue. Net Revenue Retention (NRR) includes the upsells, cross-sells, and price increases you earn from your existing customers, so it can climb above 100%. Gross Revenue Retention (GRR) excludes all of that, so it can only fall from 100%. Both measure how much recurring revenue you keep from the customers you already have over a set period. NRR tells you whether that base grows on its own. GRR tells you how much of it leaks before any growth is added.
Why the difference matters
Net Revenue Retention has become the number the whole company watches. It is no longer read as a Customer Success statistic; it is often one of the top three metrics a B2B company tracks, because it tells you how durable, predictable, and sticky the revenue base is. The economics are the reason. A renewed dollar costs about thirteen cents to earn, while a new-logo dollar costs more than a dollar at negative gross margin, with a payback period that runs twenty to thirty months. The cheapest growth a company has is expansion from customers it already serves, and that is exactly what NRR captures. The argument for running Post-Sale as a revenue function is the premise of The Growth Department. Confusing the two metrics hides a leak: a company can post a healthy NRR while its GRR erodes underneath, because expansion from a few large accounts masks churn across everyone else.
How to calculate GRR
Gross Revenue Retention over a period starts with the recurring revenue you had at the beginning of that period. You subtract the revenue lost to churn (customers who left) and contraction (customers who downgraded), then divide by the starting figure. Expansion is never added back. Because you can only lose from where you started, GRR has a hard ceiling of 100%. A GRR of 90% means you kept ninety cents of every recurring dollar you began with, before any growth. What the number tells you is the structural durability of the base, stated as a leak rate.
How to calculate NRR
Net Revenue Retention uses the same starting figure and subtracts the same churn and contraction, then adds back the expansion revenue earned from that same set of customers, and divides by the starting figure. Because expansion is included, NRR can exceed 100%. An NRR of 110% means the customers you started the period with are worth ten percent more at the end of it, with no new logos added. What the number tells you is whether the existing base is a growth engine in its own right.
The "only bad news" number
Jim Richmond, Chief Customer Officer at Smartling, keeps a Post-it on the wall that reads "only bad news." His reasoning is the mathematical fact above: because Gross Revenue Retention can never exceed 100%, the number can only fall, so the entire job of the team is to surface the risk that would pull it down early enough to act on it. He built a reaction protocol around that idea. When someone brings bad news about an account, the response is a high-five, never a sigh or a slump, because the moment surfacing risk feels unwelcome, people stop doing it and the leak goes unseen until renewal. GRR is the honest number. A single large expansion cannot inflate it, which is what makes it the truest read on whether the base is solid.
How the two work together
GRR is the floor and NRR is the growth. You cannot out-expand a leaking base for long, because churn and contraction compound while a few expansions paper over the damage until they run out. Read together, the two numbers map onto the operating standard behind them. Keep is the work that protects GRR. Grow is the expansion that lifts NRR above 100%. No Surprises is the forecasting discipline that keeps either number from catching the executive team off guard. The full scoreboard sits inside the Growth Department Method.
What to do about it
Instrument both, and lead with the one that cannot lie. Report Gross Revenue Retention first, because it exposes the leak before any growth is added, then report Net Revenue Retention to show whether the base is expanding on top of a solid floor. A team that leads with NRR alone can look healthy while the foundation erodes; a team that leads with GRR first sees the risk while there is still time to act. Protecting that floor is renewal work done account by account, which is covered on the Renewals guide. The point of both numbers is the same. Existing-customer revenue is the cheapest and most durable revenue a B2B company has, and there is no such thing as recurring revenue, only re-earned revenue.
The Growth Department is the post-sale revenue operating standard for B2B companies. Take the ten-minute Post-Sale Stress Test to see where your function stands across Clarity, Commitment, and Cadence. Or download the free audiobook of The Growth Department and read the manifesto.
About the author Alex Raymond is the founder of AMplify and the author of The Growth Department, the operating standard for the function that delivers most of a company's revenue. He spent a decade building Account Management and Customer Success systems with B2B companies before founding AMplify, where he works with Post-Sale leaders on installing the Growth Department Method. He hosts the Account Management Secrets podcast.
