Half Life Calculator

Enter all the known values. Select the proper units for your inputs and the units you want to get the calculated unknowns in and press Solve.

  • N(t) = N(0) * 0.5^(t/T)
  • N(t) = N(0) * e^(-t/τ)
  • N(t) = N(0) * e^(-λt)
per-second
Reset