BAC & PEth Simulator

Estimate blood alcohol curves, PEth formation, and decay using a simplified pharmacokinetic model.

Note! The model is experimental and not scientifically validated; not for clinical use.

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BAC unit

Model blends Widmark style BAC with first-order absorption and elimination. PEth synthesis is proportional to BAC and decays with a multi-day half-life.

Marko Grönroos (magi@iki.fi, magi.fi), 2025. Open source under GNU GPLv3+.
Source code: github.com/magi/peth-sim.

Peak BAC

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Time over 0.5‰

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Alcohol cleared

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Peak PEth

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Blood alcohol (‰)

PEth (µmol/L)

Time window First 3 days (scrollable) Until PEth < 0.05 µmol/L

Time step (minutes)

Simulation resolution; smaller step is smoother but slower.

Alcohol elimination (‰/h)

Baseline zero-order elimination before age adjustment.

Widmark r (male)

Widmark r (female)

Widmark distribution factor; defaults ~0.68 men, ~0.55 women.

Apply blood-water density factor (1.055) to Widmark volume

Use absorption model (stomach → blood)

Meal effects

Absorption multiplier by meal size; smaller value slows absorption and lowers peak BAC.

Meal	Absorption multiplier
Empty stomach
Light snack
Mixed meal
Heavy meal

PEth formation model

Saturating model fits the reported formation-rate measurements at 1-3‰.

PEth formation @ 1‰ (ng/mL/h)

Derived from 0.016 μmol/L/h at 1‰ ≈ 11.3 ng/mL/h (PEth 16:0/18:1).

BAC / PEth formation

PEth half-life (days)

Literature: ~3–6 days typical; reported range ~2–12 days.