Tools / MODEL
Population doubling time
Estimate growth over an interval using a simple exponential model and two cell-count observations.
Illustrative example
The result
Method & assumptions
Both counts and elapsed time must be positive. The model assumes exponential growth over the interval. No growth or decline does not yield a positive doubling time. Faster growth is not evidence of rejuvenation, healthy identity, or safety.
Sanity check
Growth from 100,000 to 400,000 cells over 48 hours is two doublings, or a 24-hour doubling time.
Population doublings = log2(Nfinal/Ninitial) Doubling time = elapsed time / population doublings
Implementation version 1.0 · 2026-10-15. Deterministic formulas or editorial rules, with no AI model or external service processing your inputs.