Net Revenue Retention (NRR) Calculator
Splits customer MRR movement into churn, contraction and expansion to compute GRR and NRR by start-month cohort with a reconciling bridge.
Net Revenue Retention (NRR) Calculator is a free Excel workbook: 4 sheets, 328 live formulas and realistic sample data throughout, 18 KB as .xlsx.
The formulas are printed on this page, unedited, so you can check the method before downloading anything. Swap in your own numbers and the whole file recalculates — which is the part no chat window can hand you. Opens in Excel, Google Sheets, Numbers and LibreOffice; no add-in and no macro.
A look inside
This is a real slice of the Customers sheet from the actual file — not a screenshot, and not a mock-up. Cells shown in violet are live formulas, exactly as they arrive.
| # | Customer | Start month | Starting MRR | MRR now | Churned? | Expansion | Contraction |
|---|---|---|---|---|---|---|---|
| 4 | Northgate Foods | 2025-09-01 00:00:00 | £2,200 | £2,200 | N | =IF(E4="Y",0,MAX(0,D4-C4)) | =IF(E4="Y",0,MAX(0,C4-D4)) |
| 5 | Ellwood Ltd | 2025-10-01 00:00:00 | £800 | £800 | N | =IF(E5="Y",0,MAX(0,D5-C5)) | =IF(E5="Y",0,MAX(0,C5-D5)) |
| 6 | Hallam Clinics | 2025-11-01 00:00:00 | £600 | £0.00 | Y | =IF(E6="Y",0,MAX(0,D6-C6)) | =IF(E6="Y",0,MAX(0,C6-D6)) |
| 7 | Brightwater Homes | 2025-12-01 00:00:00 | £800 | £800 | N | =IF(E7="Y",0,MAX(0,D7-C7)) | =IF(E7="Y",0,MAX(0,C7-D7)) |
| 8 | Ashby Logistics | 2026-01-01 00:00:00 | £800 | £1,353 | N | =IF(E8="Y",0,MAX(0,D8-C8)) | =IF(E8="Y",0,MAX(0,C8-D8)) |
| 9 | Fenwick & Co | 2026-02-01 00:00:00 | £1,200 | £2,089 | N | =IF(E9="Y",0,MAX(0,D9-C9)) | =IF(E9="Y",0,MAX(0,C9-D9)) |
| 10 | Marlow Dental | 2026-03-01 00:00:00 | £1,200 | £1,200 | N | =IF(E10="Y",0,MAX(0,D10-C10)) | =IF(E10="Y",0,MAX(0,C10-D10)) |
| 11 | Kestrel Media | 2026-04-01 00:00:00 | £2,200 | £2,200 | N | =IF(E11="Y",0,MAX(0,D11-C11)) | =IF(E11="Y",0,MAX(0,C11-D11)) |
What’s in the file
What it explains
- NRR above 100% means the base grows without a single new logo
- By cohort, because the average lies
- The bridge must reconcile
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