Bacterial Generation Time
Calculator
Results
- Generations elapsed
- 12.965784
- Generation time (hours)
- 0.462756
- Generation time (minutes)
- 27.765385
- Growth rate (per hour)
- 1.497866
Biology and lab results
| Generations elapsed | 12.965784 |
| Generation time (hours) | 0.462756 |
| Generation time (minutes) | 27.765385 |
| Growth rate (per hour) | 1.497866 |
formula-map diagram
- Generations elapsed
- 12.965784
- Generation time (hours)
- 0.462756
- Generation time (minutes)
- 27.765385
- Growth rate (per hour)
- 1.497866
Formula breakdown
Formula
n = log₂(N ÷ N₀) ; g = t ÷ n= 12.965784284662
Note
Simplified model: these results use standard textbook laboratory relationships and average constants (A260 = 1 for 50 µg/mL dsDNA, 617.96 g/mol per base pair, ~110 Da per amino acid, ideal exponential growth). Real samples vary with purity, contaminants, buffer, temperature and instrument calibration. Always confirm against your own standards and protocol; do not use for diagnostic or safety-critical work.
More in Biology and lab
See all →Frequently asked questions
What is generation time in bacterial growth?+
Generation time is the time it takes for a bacterial population to double in number during the exponential (log) phase of growth, and it is a direct measure of how fast a species or strain is dividing under the given conditions. It is calculated from the number of generations that occurred between two time points and the elapsed time.
What is the formula the calculator uses?+
Generation time equals the elapsed time divided by the number of generations, where the number of generations is log2(final population / initial population), often written n = 3.3 x log10(N/N0). The calculator computes n from your population counts and divides your elapsed time by it.
Why do I need to make sure my culture is in log phase?+
Generation time is only meaningful during exponential growth; during lag phase cells are not yet dividing, and during stationary phase growth has stopped due to nutrient depletion, so counts taken outside log phase will give a misleadingly long or undefined generation time.
How does temperature affect the result?+
Generation time is highly temperature-dependent for a given species, for example E. coli can double in about 20 minutes at 37°C but much slower at room temperature, so results are only comparable between experiments run at the same incubation temperature.
Can generation time differ between two counts of the same culture?+
Yes, if the two time points straddle different growth phases (say lag into log, or log into stationary) the calculated generation time will be an average across phases rather than the true log-phase value, so choose two time points both clearly within exponential growth.