Net Revenue Retention

Net Revenue Retention measures how much revenue a company's existing customer base generates over a period, relative to the same period a year earlier, factoring in expansions (upsells, upgrades), contractions (downgrades), and full churn, but explicitly excluding any revenue from new customers acquired during that time. It isolates whether the business is growing organically from its existing relationships alone.

An NRR above 100% means expansion revenue outweighs losses from downgrades and churn, the business is growing even without adding a single new customer. Below 100% means the existing base is shrinking in revenue terms, even if new sales are still bringing in additional customers. This is one of the metrics investors weight most heavily when evaluating SaaS businesses.

NRR = ((Starting Revenue + Expansion − Contraction − Churn) / Starting Revenue) × 100

A SaaS company starts the year with $1,000,000 in revenue from its existing customer base. Over the year, that same cohort generates $150,000 in expansion revenue (upsells), loses $40,000 to downgrades, and $60,000 to full churn.

• NRR = (($1,000,000 + $150,000 − $40,000 − $60,000) / $1,000,000) × 100
• NRR = ($1,050,000 / $1,000,000) × 100 = 105%

This company's existing customers are generating 5% more revenue than a year ago, even after accounting for lost accounts, without counting any new customers signed during the year.

• Excludes new customer revenue by design. This is intentional, NRR isolates the health of the existing base, new customer growth is tracked separately as a different metric entirely.
• Above 100% is genuinely rare and valuable. It signals expansion revenue outpaces losses, meaning the business compounds growth from its existing customers alone.
• A useful complement to gross churn rate. Churn alone shows losses, NRR nets losses against gains for a fuller picture of existing-customer health.
• Cohort-based calculation matters for accuracy. NRR should be calculated on the same defined customer cohort across the measurement period, not a shifting or redefined customer set.
• Heavily weighted by investors evaluating SaaS businesses. High NRR suggests durable, capital-efficient growth that doesn't rely entirely on continuously expensive new customer acquisition.