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What is GRR?

Gross Revenue Retention is the percentage of MRR you keep from existing customers, not counting any expansion. It only looks at losses — churn and contraction. It answers: “Of the revenue I had last period, how much survived?” GRR can never be above 100%.

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How to Calculate It

GRR = Retained MRR (excluding expansion) / Previous period MRR × 100
Example:
  • MRR from existing customers last month: $10,000
  • MRR retained (after churn and contraction): $9,200
GRR = $9,200 / $10,000 × 100 = 92%

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Why It’s Useful

GRR shows your revenue floor — how much you keep before any growth from expansion. A GRR below 85% means you’re losing too much revenue and need to fix retention before focusing on growth. For the full picture including expansion, see NRR. Bigdelta calculates this automatically from your billing data.