Tmax Calculator
⏱️ Tmax Calculator
Calculate the time required to reach maximum plasma drug concentration.
Tmax = [ln(ka) − ln(ke)] ÷ (ka − ke)
Unit: time⁻¹ (e.g., hr⁻¹)
Unit: time⁻¹ (e.g., hr⁻¹)
Calculated Time to Maximum Concentration
0 time units
Pharmacokinetic note:
Tmax is the time at which the drug reaches its maximum plasma
concentration (Cmax) after administration. For a simple one-compartment
oral model with first-order absorption and elimination, Tmax is calculated
from the absorption rate constant (ka) and elimination rate constant (ke).
The calculated time uses the same time unit associated with the rate
constants.