Net Dollar Retention Calculator
Calculate NDR for a customer cohort: ending revenue over starting revenue with expansion and churn included.
Net dollar retention
What it measures
NDR compares what a fixed set of customers pays now against what the same set paid a period ago. It is the same idea as NRR, expressed directly as ending over starting revenue.
Why it matters
Investors read NDR as the compounding engine of a SaaS business. It answers whether accounts grow after they land.
A worked example
A cohort paying 50,000 a year ago pays 54,000 today: NDR is 108 percent, so the base grew 8 percent with no new sales.
How to read and improve it
Price reviews, usage tiers and expansion focused account management are the standard levers.
Frequently asked questions
NDR or NRR?
The terms get used interchangeably. What matters is that the cohort is fixed and new customers stay out of it.
Over what period?
Twelve months is standard. Shorter windows are noisy.
More in SaaS metrics: SaaS CAC Calculator · Customer Lifetime Value Calculator · Churn Rate Calculator
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