ABC Tools
Blood Alcohol Estimator illustration

Blood Alcohol Estimator

Estimates blood alcohol concentration with the Widmark formula from drinks consumed, body weight, sex and hours elapsed, with a decay chart and the time until common legal limits are reached.

Read the full guide to this tool

One standard drink ≈ 330 ml beer, 100 ml wine or 30 ml spirits.
10 g is the common definition; UK units are 8 g, US drinks 14 g.

Notes

  • Widmark: BAC = grams of alcohol / (body weight × r), minus 0.015 % per hour; r ≈ 0.68 for men, 0.55 for women.
  • Real absorption depends on food, medication, and individual metabolism. Never use this to decide whether you can drive — if you drank, don't.
  • This is an educational estimate, not medical advice; consult a professional for decisions about your health.

Explore the idea

This interactive demo needs JavaScript.

Read the full guide for the explanation behind it

Related tools

Antibiotic Resistance Evolution Simulator

Watch bacteria evolve resistance — and see why finishing the course matters.

Drug Half-Life & Dosing Simulator

Plot how a drug builds up and washes out of your body across a full dosing schedule.

Herd Immunity Threshold Explorer

See how vaccinating enough people stops an outbreak for everyone.

Ovulation & Fertility Calculator

Fertile window and ovulation for the next six cycles.

Pregnancy Due Date Calculator

Due date from last period, conception or IVF transfer.

Water Intake Calculator

Daily fluid target from weight, exercise and climate.