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Retention Curve Calculator
Fit a power-law curve to your early cohort retention and project it out to a year.
D1 (%)
D3 (%)
D7 (%)
D30 (%)
Leave a field at 0 to exclude it — at least two values are required to fit a curve. Including D30 meaningfully improves the accuracy of long-range predictions.
Your retention curve
r(n) = 0.400 · n-0.356
Predicted Dn retention if new cohorts follow this historical pattern.
| Day | Dn retention |
|---|---|
| D1 | 40.00% |
| D3 | 27.05% |
| D7 | 20.00% |
| D14 | 15.62% |
| D30 | 11.91% |
| D60 | 9.30% |
| D90 | 8.05% |
| D180 | 6.29% |
| D365 | 4.89% |
Fit via least squares on log-transformed retention — the standard approach for this curve shape.
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