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Net Revenue Retention Calculator

NRR = (Starting ARR + Expansion − Contraction − Churn) ÷ Starting ARR. The single best signal of whether your existing customers grow your revenue or shrink it.
Net Revenue Retention
107.0%
Gross Revenue Retention
87.0%
Ending ARR (this cohort)
$1.1M
VerdictJust above water. Working but not compounding.
Cohort change visualization
Starting ARR
$1.0M
+ Expansion
+$200K
− Contraction
−$50K
− Churn
−$80K
= Ending ARR
$1.1M

What is the net revenue retention calculator?

Net Revenue Retention (NRR) measures how the revenue from a cohort of existing customers changes over time. It's calculated for a specific cohort over a window (usually 12 months):

NRR = (Starting ARR + Expansion − Contraction − Churn) ÷ Starting ARR

NRR > 100%means existing customers grow your revenue. NRR = 100% means flat. NRR < 100% means you're losing more than you're gaining and have to replace it with new customers.

Why this matters for founders & operators

NRR is one of the two or three most important SaaS metrics. Investors at every stage from Series A onwards look at it specifically because:

  • NRR ≥ 110% means the company can grow without new customers. Compounding existing accounts is the most efficient growth.
  • NRR ≥ 130% is best-in-class. Companies like Snowflake, Datadog, MongoDB hit this at scale.
  • NRR < 100% means a leaky bucket. Even fast-growing companies struggle when they can't retain.

Pair with Quick Ratio and Burn Multiple for the full SaaS health view.

How to use this calculator

  1. 1
    Use a 12-month cohort window

    Standard. Take customers active 12 months ago and measure their revenue today.

  2. 2
    Don't include new customers

    NRR is a same-customer metric. New revenue from new customers belongs in net new ARR, not NRR.

  3. 3
    Track NRR by segment

    Enterprise customers usually have higher NRR than SMB. Blended NRR can hide important patterns.

FAQ

What's a great NRR for SaaS?+
≥ 130% is best-in-class. 110-130% is healthy. 100-110% is workable. Below 100% means you're shrinking the existing book.
What's the difference between NRR and GRR?+
GRR (Gross Revenue Retention) excludes expansion — it's just (Starting − Contraction − Churn) ÷ Starting. GRR can never exceed 100%. NRR includes expansion and can.
Should I use ARR or MRR for NRR?+
Either works. ARR-based NRR is annual; MRR-based NRR is monthly. Most companies report annual NRR. Make sure you're consistent.
How is NRR different from net dollar retention (NDR)?+
Same metric, different names. NRR and NDR are interchangeable in 95% of contexts.