When Can I Drive After 4 Pints of Beer?
Four pints is a heavy session. Equivalent to over 6 standard US drinks, this amount of alcohol will push all adults to significant BAC levels — above 0.15% for most, and above 0.20% for lighter individuals. Driving is not safe for many hours, potentially until the next day. This guide provides 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 pints of beer (568 ml each at 5% ABV) contain approximately 90 grams of ethanol — equivalent to approximately 6.4 standard US drinks. This is a heavy drinking session that will produce dangerous BAC levels in all adults. 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 Pints of Beer by Weight and Sex
Peak BAC immediately after consuming 4 pints of beer, 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 | 0.243% | 0.301% | 10.9 hrs | 14.7 hrs | 16.2 hrs | 20.1 hrs |
| 140 lb | 0.208% | 0.258% | 8.5 hrs | 11.9 hrs | 13.9 hrs | 17.2 hrs |
| 160 lb | 0.182% | 0.226% | 6.8 hrs | 9.7 hrs | 12.1 hrs | 15.1 hrs |
| 180 lb | 0.162% | 0.200% | 5.5 hrs | 8.0 hrs | 10.8 hrs | 13.3 hrs |
| 200 lb | 0.146% | 0.180% | 4.4 hrs | 6.7 hrs | 9.7 hrs | 12.0 hrs |
| 220 lb | 0.133% | 0.164% | 3.5 hrs | 5.6 hrs | 8.9 hrs | 10.9 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 pints consumed over 4 hours allows elimination of 0.060% BAC during drinking. Even with this pacing, a 160 lb male (peak 0.173%) ends up with effective BAC of about 0.113% at the 4-hour mark — still significantly over the limit. A 200 lb male (peak 0.145%) ends at about 0.085%. Pacing helps but does not fully offset this volume of alcohol.
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 pints means not driving that evening. Period. For most adults, particularly women and lighter individuals, the safe driving threshold will not be reached until the following morning, and sometimes not until mid-morning. Use the morning-after BAC calculator to check your status before driving the next day.
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
How long after 4 pints can I drive?
For a 180 lb male (peak BAC ~0.173%), about 6.2 hours to reach 0.08% and 11.5 hours to reach 0.00%. For a 160 lb female (peak BAC ~0.224%), about 9.6 hours to reach 0.08% and 14.9 hours to reach 0.00%. Most people will not be safe to drive until the following morning.
Can I drive the morning after 4 pints?
Only if you stopped drinking early enough. Finishing 4 pints at 9 p.m. and waking at 8 a.m. (11 hours): a 180 lb male (peak 0.173%) would have 0.173% − 0.165% = 0.008% — essentially clear. A 140 lb female (peak 0.282%) would have 0.282% − 0.165% = 0.117% — still dangerously over the limit. Use a calculator.
Is 4 pints excessive drinking?
Four pints equals 6.4 standard drinks — significantly above binge drinking thresholds (4+ drinks for women, 5+ for men in 2 hours per NIAAA). At this level, impairment is severe and serious health risks including alcohol poisoning become relevant for lighter individuals with BAC approaching 0.20%+.
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.