Exponential Growth Calculator I want to calculate: Doubling time (Td) Growth rate (r) Final count (Nt) Initial count (N0) Elapsed time (t) Initial cell number/concentration: Final cell number/concentration: Elapsed time (t in hours): Growth rate (r): Doubling time (Td): Calculate Reload calculator Clear all changes Growth rate (r): per hour Doubling time (Td): hours Final count (Nₜ): Initial count (N₀): Elapsed time (t): hours Formula Used How the calculator works?