When Can I Drive After 4 Glasses of Wine?
Four glasses of wine is the equivalent of splitting a bottle between two people — a completely normal social scenario. However, this amount produces significant BAC levels that require most people to wait many hours before driving safely. Here are the exact numbers.
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.
Four standard glasses of wine (150 ml each at 13% ABV) contain approximately 62.4 grams of ethanol — equivalent to roughly 4.5 standard drinks, or just over half a standard 750 ml bottle. 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 4 Glasses of Wine by Weight and Sex
Peak BAC immediately after consuming 4 glasses of wine, 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 | 0.169% | 0.208% | 5.9 hrs | 8.5 hrs | 11.3 hrs | 13.9 hrs |
| 140 lb | 0.145% | 0.179% | 4.3 hrs | 6.6 hrs | 9.7 hrs | 11.9 hrs |
| 160 lb | 0.126% | 0.156% | 3.1 hrs | 5.1 hrs | 8.4 hrs | 10.4 hrs |
| 180 lb | 0.112% | 0.139% | 2.1 hrs | 3.9 hrs | 7.5 hrs | 9.3 hrs |
| 200 lb | 0.101% | 0.125% | 1.4 hrs | 3.0 hrs | 6.7 hrs | 8.3 hrs |
| 220 lb | 0.092% | 0.114% | 0.8 hrs | 2.3 hrs | 6.1 hrs | 7.6 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?
Four glasses over a 4-hour dinner eliminates 0.060% during drinking. For a 200 lb male (peak 0.108%), effective BAC at the 4-hour mark is about 0.048% — under the limit. For a 160 lb female (peak 0.195%), effective BAC at 4 hours is about 0.135% — still considerably over the limit.
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?
Four glasses of wine is serious. Even with pacing over several hours, lighter individuals and women will remain over the legal limit for the duration of the evening and potentially well into the next morning. If you plan to have 4 glasses, plan your transportation before you start.
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 half a bottle of wine?
Half a standard bottle of wine (375 ml at 13%) contains about 39g of ethanol. Four standard 150 ml glasses contain slightly more (62.4g). At either amount, all adults will be over the legal limit. Plan for 5–9 hours of waiting depending on your weight and sex.
How many hours after 4 glasses of wine can I drive?
For a 180 lb male (peak BAC ~0.133%), about 3.5 hours to reach 0.08% and 8.9 hours to reach 0.00%. For a 140 lb female (peak BAC ~0.247%), about 11.1 hours to reach 0.08% and 16.5 hours to reach 0.00% — an overnight wait.
Am I sober after sleeping 8 hours after 4 glasses of wine?
It depends on your weight and when you stopped drinking. A 180 lb male stopping at midnight with a peak BAC of 0.133% would have 0.133% − (8 × 0.015%) = 0.013% at 8 a.m. — nearly zero. A 140 lb female with peak 0.247% would have 0.247% − 0.120% = 0.127% — still significantly impaired. Use the morning-after calculator.
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.