When Can I Drive After 1 Glass of Wine?
One glass of wine with dinner is common and considered moderate drinking by most standards. For most adults, it produces a BAC well under the legal limit — but 'well under' depends heavily on your weight and sex. This guide calculates the exact numbers for a standard 150 ml glass at 13% ABV.
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 glass of wine (150 ml at 13% ABV) contains approximately 15.6 grams of ethanol — slightly more than a standard beer and equivalent to roughly 1.1 standard drinks. 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 Glass of Wine by Weight and Sex
Peak BAC immediately after consuming 1 glass 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 | 0.042% | 0.052% | Already under | Already under | 2.8 hrs | 3.5 hrs |
| 140 lb | 0.036% | 0.045% | Already under | Already under | 2.4 hrs | 3.0 hrs |
| 160 lb | 0.032% | 0.039% | Already under | Already under | 2.1 hrs | 2.6 hrs |
| 180 lb | 0.028% | 0.035% | Already under | Already under | 1.9 hrs | 2.3 hrs |
| 200 lb | 0.025% | 0.031% | Already under | Already under | 1.7 hrs | 2.1 hrs |
| 220 lb | 0.023% | 0.028% | Already under | Already under | 1.5 hrs | 1.9 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?
A typical glass of wine is often consumed over 45–90 minutes, especially with a meal. If you spent 1.5 hours with your glass of wine, approximately 0.023% of BAC was eliminated during drinking. For most adults above 140 lb, this means your effective BAC at the end of the meal is very close to zero — but not necessarily exactly zero.
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 glass of wine, most adults above 140 lb are under 0.08% BAC and will clear to 0.00% within 1.5–2.5 hours. Lighter women should wait at least 2 hours. If your pour was larger than 150 ml or your wine exceeded 13% ABV, adjust expectations upward.
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 glass of wine?
Most adults above 140 lb (male) or 160 lb (female) will be under 0.08% BAC after one 150 ml glass of wine. However, BAC will still be above 0.00% for 1–2.5 hours. Lighter women should wait 2–3 hours to be safe.
Is a restaurant wine glass 150 ml?
Restaurant wine pours vary widely. A standard US restaurant pour is typically 150–175 ml (5–6 fl oz). Larger 250 ml pours are common at some establishments. If your glass was larger, your ethanol intake was proportionally higher — a 250 ml pour at 13% contains 26g ethanol, nearly double the standard.
Does white wine affect BAC differently than red wine?
The type of wine does not affect BAC — only the volume and ABV matter. A 150 ml glass of 13% white wine and a 150 ml glass of 13% red wine contain the same 15.6g of ethanol and will produce identical BAC levels. However, sparkling wines (champagne, prosecco) may be absorbed slightly faster due to carbonation effects.
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.