Cell Doubling Time Calculator
Find the doubling time and growth rate of cells or bacteria from two counts, or predict a future count.
Doubling time
24 hours
- Growth rate (r)
- 0.0288811 per hour
- Doublings (generations)
- 3
- Fold increase
- 8×
Show the work
Growth rate
r = ln(N ÷ N₀) ÷ t
ln(800,000 ÷ 100,000) ÷ 72 = 0.0288811 per hour
Doubling time
Td = ln 2 ÷ r
ln 2 ÷ 0.0288811 = 24 hours
How it works
Doubling time Td = t × ln 2 ÷ ln(N ÷ N₀); growth rate r = ln(N ÷ N₀) ÷ t; N = N₀ × 2^(t ÷ Td)
Questions
- How does the cell doubling time calculator work?
- Doubling time Td = t × ln 2 ÷ ln(N ÷ N₀); growth rate r = ln(N ÷ N₀) ÷ t; N = N₀ × 2^(t ÷ Td).
- What do I need to enter?
- I want, Time unit, Starting count (N₀), Ending count (N), Doubling time, Time elapsed. Optional fields can be left blank.
Related tools
- Animal Gestation CalculatorEstimate the due-date range for a dog, cat, horse or cow from the breeding date, using veterinary gestation ranges.
- Punnett Square CalculatorCross two parents for one or two genes and see the Punnett square with genotype and phenotype ratios.
- Carbon Footprint CalculatorEstimate the yearly CO2e from your driving and flights using the U.S. EPA's 2025 emission factors.
- Gas Concentration Converter (ppm ↔ mg/m³)Convert gas concentrations between ppm/ppb and mg/m³ or µg/m³ using the gas's molar mass, temperature and pressure.
- Molar Mass CalculatorFind the molar mass of any chemical formula — brackets and hydrates included — with each element's share.
- Grams to Moles CalculatorConvert between grams, moles and number of particles for any substance, using its formula or molar mass.
Want this on your site? Embed the cell doubling time calculator.