How long until I am sober?

Roughly 0.015% BAC drops per hour after absorption peaks — but individual rates vary. When in doubt, use a rideshare or designated driver.

Health

Blood Alcohol Calculator

Estimated blood alcohol concentration

Runs locally in your browser

Weight (lb)

Sex

Standard drinks

Hours since first drink

Reference estimate only. 1 standard drink ≈ 14 g pure alcohol. US legal driving limit is 0.08% BAC. Not for medical use.

Estimates blood alcohol concentration (BAC) from weight, sex, standard drinks, and elapsed time.

Who it's for: Adults understanding intoxication levels — not for deciding whether to drive (never drive after drinking).

Uses the Widmark equation with US standard drinks (14 g / 0.6 oz pure ethanol each).

Applies sex-specific body water constants (r = 0.68 male, 0.55 female).

Subtracts ~0.015% BAC per hour for metabolism and flags levels above the 0.08% US legal driving limit.

Enter Weight in pounds.
Select Sex — affects alcohol distribution volume.
Enter Standard drinks consumed (1 drink = 12 oz beer 5%, 5 oz wine 12%, or 1.5 oz 80-proof spirits).
Enter Hours since first drink for metabolism adjustment.
Read BAC (estimate) in percent — US legal limit for driving is 0.08% in most states.
Check Status — Dangerous indicates above 0.08%; do not drive at any elevated BAC.

Food, medications, tolerance, and drink strength dramatically affect real BAC — this is not a breathalyzer.
Utah and some jurisdictions use 0.05% limits; commercial drivers face stricter federal limits (0.04%).

How long until I am sober?: Roughly 0.015% BAC drops per hour after absorption peaks — but individual rates vary. When in doubt, use a rideshare or designated driver.