Time above MIC calculator for beta-lactams
Formula

Where
ln = natural logorithm;
Vd = volume of distribution (L/kg);
BW = Body weight (kg);
T 1/2 = Serum half-life (hours); and
DI = dosing interval (hours)
Reference
Turnidge JD. The pharmacodynamics of β‐Lactams. Clinical Infectious Diseases. 1998;27(1):10-22. doi:10.1086/514622