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Net revenue retention calculator. Does your base grow itself?

A free net revenue retention calculator that shows whether your existing customers grow in value over time, even before you add a single new one. The metric investors increasingly treat as the truest signal of SaaS quality.

The calculator

NRR calculator calculator, live.

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Net revenue retention
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This calculator runs entirely in your browser. Nothing you enter is sent anywhere or stored. It is a quick estimate, not financial advice.

Why it matters

Reading your nrr calculator right.

Net revenue retention measures what happens to a group of customers over a year without counting any new ones. Above 100% means your existing base grows in value all by itself, which is the closest thing SaaS has to a perpetual motion machine. This calculator takes a cohort's starting revenue, adds expansion, subtracts contraction and churn and gives you the NRR.

Investors increasingly treat NRR as the single truest signal of SaaS quality and for good reason. A SaaS with NRR above 120% grows over 20% a year even if it never sells to a new customer, which makes growth far cheaper and more durable. If you only improve one retention metric, NRR is usually the one that moves valuation most.

How to use it

How the nrr calculator works.

01

Pick a cohort and a period

Take a defined group of customers and measure them over a period, usually a year. Use their starting MRR as the base.

02

Add expansion, subtract the rest

Add expansion MRR from upgrades and upsell, then subtract contraction from downgrades and fully churned MRR.

03

Divide by the starting base

Divide the net figure by the starting MRR. Above 100% means the cohort grew in value without any new customers.

NRR = (Starting MRR + Expansion - Contraction - Churn) / Starting MRR x 100
Take a cohort of customers from a year ago. Starting MRR is what they paid then. Add expansion, subtract contraction and churn, divide by the starting MRR. Above 100% means the cohort grew.
Common questions

What people ask about the net revenue retention calculator.

What is a net revenue retention calculator?+

A net revenue retention calculator works out how the revenue from an existing group of customers changes over a period, after expansion, contraction and churn, without counting new customers. NRR above 100% means the existing base grows in value on its own, which is a powerful signal of product value and a driver of cheap, durable growth. It is calculated from a cohort's starting MRR adjusted for what happened to that cohort over the period.

How do you calculate net revenue retention?+

Take the MRR from a cohort of customers at the start of a period, add the expansion MRR they generated through upgrades and upsell, subtract contraction from downgrades and the MRR fully lost to churn, then divide by the starting MRR and multiply by 100. Crucially, you do not include any new customers acquired during the period. NRR isolates what happened to the customers you already had.

What is a good NRR for SaaS?+

At or above 100% is good, because it means your existing base is at least holding its value. 110 to 120% is excellent and above 120% is best-in-class, indicating the base grows more than 20% a year with no new customers at all. The strongest enterprise SaaS companies sustain NRR well above 120%. Below 100% the base shrinks without new sales, which makes growth expensive and fragile.

Why do investors care so much about NRR?+

Because NRR above 100% means a SaaS grows even without acquiring new customers, which makes growth cheaper, more predictable and more durable. It signals strong product value, effective expansion and low churn all at once. A high NRR compounds: a company at 120% NRR doubles its existing-base revenue roughly every four years with zero new logos. That durability is why NRR has become one of the most watched metrics in SaaS valuation.

What is the difference between NRR and gross retention?+

Gross revenue retention counts only losses, churn and contraction and can never exceed 100%, so it measures how well you hold onto revenue. Net revenue retention also includes expansion, so it can exceed 100% when upsell outweighs losses. Gross retention shows your leak rate, while NRR shows the net result after expansion fills the leak. A healthy SaaS watches both: strong gross retention plus expansion produces high NRR.

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