MRR growth projector
See where your MRR is likely to land — combining new business, expansion revenue, and churn into a single month-by-month projection.
Enter your starting MRR, how much new MRR you add each month, your monthly expansion rate, and your monthly churn rate. The calculator compounds all three forward across your chosen time horizon.
MRR growth projector inputs and results
How this calculator works
Each month is calculated from the month before it, not from your original starting number. Churn and expansion are both applied as a percentage of that month's MRR, so as your base grows, both the dollar impact of churn and the dollar value of expansion grow with it. New MRR is added on top as a flat amount, since new business each month is usually driven by sales and marketing capacity rather than the size of your existing base.
This means the same churn rate or expansion rate has a bigger dollar effect later in the projection than it does at the start, simply because the base it's being applied to has grown. That compounding is also why small changes to churn or expansion rates tend to matter more over longer time horizons.
About this tool
This tool is a free calculator. Inputs: starting MRR, new MRR added per month, monthly expansion rate %, monthly churn rate %, time horizon in months. Output: projected MRR at the end of the horizon, total MRR added, and a month-by-month view of the climb or decline. Formula basis: each month's MRR is reduced by churn, increased by expansion on the existing base, then increased by new MRR added.
Frequently asked questions
How is MRR growth projected?
Each month, the calculator takes the previous month's MRR, subtracts what churn would remove, adds expansion revenue calculated as a percentage of that same base, then adds a fixed amount of new MRR from new customers. That new total carries forward as the starting point for the next month, so the effects compound rather than apply only once.
What's the difference between this and the churn impact calculator?
The churn impact calculator isolates churn alone, assuming no new growth, to show what churn is costing you in isolation. This tool adds new business and expansion revenue back in, so you can see your likely MRR trajectory overall, not just the cost of churn on its own.
What counts as expansion revenue?
Expansion is additional revenue from your existing customers — upgrades, add-ons, or seat growth — as opposed to revenue from brand new customers. It's entered here as a percentage of your existing MRR each month, since expansion tends to scale with the size of your base rather than being a fixed dollar amount.