Alcohol Metabolism Calculator
Estimate how long until you are sober based on your weight, drinks consumed, and time drinking.
See your estimated BAC over time.
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Time Until Sober
Alcohol metabolism follows the Widmark formula to estimate Blood Alcohol Content (BAC) and elimination time.
Widmark Formula:
BAC = (Alcohol in grams / (Body Weight in grams × r)) × 100 - (0.015 × Hours)
Where r (distribution ratio):
- Male: 0.68
- Female: 0.55
Standard drink = ~14 grams of pure alcohol:
- 12 oz (355 mL) beer (5% ABV)
- 5 oz (148 mL) wine (12% ABV)
- 1.5 oz (44 mL) spirits (40% ABV)
Metabolism rate:
- The body eliminates alcohol at approximately 0.015% BAC per hour
- This rate is fairly constant regardless of body size
- Nothing speeds up alcohol metabolism (not coffee, food, or cold showers)
BAC levels and effects:
| BAC | Effects |
|---|---|
| 0.02% | Mild relaxation |
| 0.05% | Reduced inhibitions, impaired judgment |
| 0.08% | Legal limit in most countries. Impaired coordination |
| 0.15% | Major impairment, slurred speech |
| 0.30% | Potential loss of consciousness |
| 0.40%+ | Life-threatening |
Weight conversions: 1 kg = 2.205 lbs | 1 lb = 0.4536 kg
Disclaimer: This is an estimate only. Individual metabolism varies. Never drive if you have been drinking.