24
hours
0.0289
1/hour
3
8
x
1
1/day
24
hours
0.0289
1/hour
3
8
x
1
1/day
The Cell Doubling Time Calculator determines how long it takes for a cell population to double in number during exponential growth. Doubling time is a critical parameter in cell biology used to characterize cell lines, optimize culture conditions, and plan experiments that require specific cell densities at defined time points.
Simply enter the initial and final cell counts along with the elapsed time, and this tool will compute the doubling time, growth rate, and total number of doublings that occurred.
During exponential growth, cell number increases according to Nf = Ni × 2^(t/Td), where Td is the doubling time. Solving for Td:
Td = t × log(2) / log(Nf / Ni)
The specific growth rate (µ) in natural log units is:
µ = ln(Nf / Ni) / t
The total number of population doublings is:
Doublings = log₂(Nf / Ni)
Inputs
Results
Starting with 50,000 cells and reaching 400,000 in 72 hours gives a doubling time of 24 hours, consistent with typical HeLa cells. The population doubled 3 times.
Inputs
Results
Primary cells that exactly doubled in 48 hours have a doubling time of 48 hours and completed 1 population doubling.
Most commonly used mammalian cell lines have doubling times between 18 and 30 hours. HeLa cells typically double in about 22-24 hours, CHO cells in 14-17 hours, and HEK293 cells in 34-36 hours. Primary cells are usually much slower, often 48 hours or more.
Ensure cells were in exponential growth phase during the measurement period. If cells were in lag phase (just after passaging) or stationary phase (confluent), the doubling time will be inaccurate. Also verify that your cell counts are accurate and that the time measurement is precise.
Growth rate (µ) and doubling time (Td) are inversely related: µ = ln(2) / Td. A higher growth rate means a shorter doubling time. The growth rate is expressed in units of per-time (e.g., per hour) and represents the fractional increase in population per unit time.
Roboculator Team
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