Generation Time Calculator
Calculate the generation time (doubling time) and growth rate of cells during exponential growth. Essential for modeling bacterial growth phases.
Growth Variables
Specify initial and final populations and time elapsed.
Generation Time (G)
* Time required for the cell count to double.
Log Phase Validity
Ensure measurements are taken during active logarithmic (exponential) growth phase.
Generation Times across Microorganisms Reference Table
| Organism / Microbe | Growth Conditions | Generation Time (G) | Generations per Hour (μ) |
|---|---|---|---|
| Escherichia coli | Optimal LB broth, 37°C | 20 minutes (0.33 hrs) | 3.00 gen/hr |
| Saccharomyces cerevisiae (Yeast) | YPD medium, 30°C | 90 minutes (1.50 hrs) | 0.67 gen/hr |
| Bacillus subtilis | Nutrient broth, 37°C | 26 minutes (0.43 hrs) | 2.31 gen/hr |
| Mycobacterium leprae | In vivo (Armadillo model) | 14 days (336 hrs) | 0.003 gen/hr |
Calculation Methodology & Equations
Generations (n)
Measures total doubling cycles.
Generation Time (G)
Time per binary fission cycle.
Growth Rate (μ)
Generations per unit time.
Frequently Asked Questions
What is Generation Time in microbiology? ▼
Generation time (G) is the time required for a microbial population to double in cell number via binary fission during exponential growth.
How is Generation Time calculated? ▼
First calculate number of generations n = (log10(Nt) - log10(N0)) / log10(2). Then divide elapsed time by generations: G = t / n.
What is the relationship between Generation Time and Growth Rate (μ)? ▼
They are inversely proportional: Growth rate μ = 1 / G (in generations per hour) or μ = ln(2) / G (specific growth rate constant).
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