When Can I Drive After 1 Shot of Spirits?
One shot of spirits is the equivalent of one standard drink — the same alcohol content as a regular beer or a small glass of wine. For most adults at typical body weights, one shot puts BAC well under the legal limit. However, it is not zero, and lighter individuals and women need to account for the measurable BAC even after a single shot.
Use our free BAC calculator to get a personalised estimate based on your weight, sex, and drinks.
Calculate Your BAC Now →The Math: How BAC Is Calculated
BAC is calculated using the Widmark formula: BAC = (ethanol grams × 100) / (weight_kg × r × 1000), where r = 0.68 for males and r = 0.55 for females, and weight_kg = lb / 2.205.
One standard US shot (44 ml / 1.5 fl oz at 40% ABV) contains approximately 14 grams of ethanol — exactly the same as a standard beer or a 150 ml glass of wine. Alcohol is then eliminated at approximately 0.015% BAC per hour. The table below shows peak BAC (no metabolism during drinking) and the hours needed to reach key thresholds.
BAC Chart for 1 Standard Shot by Weight and Sex
Peak BAC immediately after consuming 1 standard shot, before any metabolism is applied. Hours to 0.08% and 0.00% are calculated from this peak at 0.015%/hr.
| Weight | Male BAC | Female BAC | Male → 0.08% | Female → 0.08% | Male → 0.00% | Female → 0.00% |
|---|---|---|---|---|---|---|
| 120 lb | 0.038% | 0.047% | Already under | Already under | 2.5 hrs | 3.1 hrs |
| 140 lb | 0.032% | 0.040% | Already under | Already under | 2.1 hrs | 2.7 hrs |
| 160 lb | 0.028% | 0.035% | Already under | Already under | 1.9 hrs | 2.3 hrs |
| 180 lb | 0.025% | 0.031% | Already under | Already under | 1.7 hrs | 2.1 hrs |
| 200 lb | 0.023% | 0.028% | Already under | Already under | 1.5 hrs | 1.9 hrs |
| 220 lb | 0.021% | 0.026% | Already under | Already under | 1.4 hrs | 1.7 hrs |
Use our free BAC calculator to get a personalised estimate based on your weight, sex, and drinks.
Calculate Your BAC Now →What If You Drank Over More Than 1 Hour?
A single shot consumed over 30–45 minutes (as part of a cocktail sipped slowly) means some alcohol is being eliminated during consumption. For most adults, by the time you finish a single cocktail in a typical social setting, your peak BAC has already begun to decline.
What Factors Make Your BAC Higher or Lower?
- Body composition: Higher body fat percentage (less body water) means higher BAC per drink. Muscular individuals may have lower BAC than the table suggests.
- Food: Eating before or during drinking slows alcohol absorption and reduces peak BAC by up to 50%. The table assumes drinking without food.
- Drinking speed: Spreading drinks over more time allows metabolism to offset absorption, reducing peak BAC. The table shows worst-case (all drinks at once).
- Tolerance: Tolerance affects how drunk you feel, not your actual BAC. A high-tolerance drinker feels less impaired at 0.10% but is equally impaired on measurable tests.
- Medications: Many medications interact with alcohol and can raise effective BAC or increase impairment.
The Bottom Line: When Is It Safe to Drive?
After one standard shot, most adults above 140 lb are under 0.08% immediately. The BAC will clear to 0.00% within 1–2.5 hours depending on your weight and sex. If your shot was a double, large pour, or higher than 40% ABV (many whiskeys and vodkas are 43–50%), the numbers are proportionally higher.
The legal limit in most US states is 0.08%. Utah's limit is 0.05%. Commercial drivers face a 0.04% limit. International limits are often lower (0.05% in most of Europe, 0.02% in Sweden and Poland). If you are driving internationally or professionally, use the appropriate threshold.
When in doubt, do not drive. A ride-share, taxi, or designated driver is always the right call.
Use our free BAC calculator to get a personalised estimate based on your weight, sex, and drinks.
Calculate Your BAC Now →Frequently Asked Questions
Can I drive after 1 shot?
For most adults above 160 lb (male) or 180 lb (female), one standard shot produces a BAC under 0.08%. However, BAC will not be zero for 1–2.5 hours. Lighter individuals and women may have BAC near or slightly above 0.08%. Check the table for your weight.
Is 1 shot the same as 1 beer?
Yes — a standard shot (44 ml, 40% ABV), a standard beer (355 ml, 5% ABV), and a standard glass of wine (150 ml, 13% ABV) all contain approximately 14 grams of ethanol and count as 1 standard drink.
What about a double shot?
A double shot (88 ml at 40% ABV) contains 28g of ethanol — the same as 2 standard drinks. BAC impact is doubled compared to a single shot. See our article on driving after 2 shots for that scenario.
Disclaimer: This article is for educational purposes only and does not constitute legal or medical advice. BAC estimates are approximations. Individual results vary based on body composition, food intake, health status, and other factors. Never drive if you feel impaired. When in doubt, don't drive.