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health.volume-distribution-estimate Calculator
Estimates apparent volume of distribution (Vd) from dose and peak plasma concentration, and classifies the likely tissue penetration. Vd above 1 L/kg indicates extensive tissue distribution — drugs with very high Vd (chloroquine: 400 L/kg) are primarily intracellular.
Inputs
Dose Mg
Amount of medication administered per period. Most dosing is weight-based — verify with a licensed prescriber before clinical use.
Cmax Mg L
Amount of solute per unit volume. Higher concentration = more solute dissolved.
Bioavailability Pct
Reference formula or conversion factor shown for context.
Protein Binding Pct
Reference formula or conversion factor shown for context.
Results
apparent Vd (L)
Sample size or count used in the calculation.
Vd per kg (assuming 70kg)
The arithmetic total of all input values.
free drug fraction fu
Sample size or count used in the calculation.
free volume Vd/fu (L)
The computed three-dimensional volume.
Vd interpretation
Qualitative summary of what the computed numbers mean in practical terms.
Vd = dose × F / Cmax
Reference formula or conversion factor shown for context.