Can You Drive After 4 Drinks?
Alex Harmon · Updated June 2026 · Widmark Formula
The honest answer to 'can you drive after 4 Drinks?' is: it depends on your weight, gender, and time elapsed. The 0.08% BAC legal limit in all 50 states doesn't care how many drinks you think you've had — it only measures your blood alcohol content. For some people, 4 Drinks is enough to hit or exceed 0.08%. For others, it's well below. The table below shows your personalized estimate.
Your BAC After 4 Drinks
Select your gender for the most accurate estimate. Assumes all drinks consumed in a short window, 0 hours elapsed.
Subtract 0.015% per hour since your last drink. For 1 hour elapsed, subtract 0.015; for 2 hours, subtract 0.030; etc.
🧮 Use the Full BAC Calculator — enter exact drinks, time & weight →How Long Before You Can Drive?
Your liver metabolizes alcohol at approximately 0.015% BAC per hour — this rate is constant and cannot be sped up by coffee, food, water, or sleep. The table below shows approximately how many hours after your last drink you need to wait to reach 0.00%:
Remember: These are estimates based on the Widmark formula. Individual factors — food consumed, drinking speed, age, health, medications — can raise or lower actual BAC. The only reliable way to know your BAC before driving is a personal breathalyzer.
Why "I Feel Fine" Isn't Enough
Alcohol impairs judgment before it impairs the sense of impairment. By the time you're questioning whether you should drive, your reaction time, hazard detection, and decision-making are already measurably degraded — even if you feel normal. Studies show that drivers at 0.05% BAC have statistically significantly elevated crash risk compared to sober drivers, well before reaching the 0.08% legal limit.
High alcohol tolerance means you feel less affected at a given BAC. It does not mean your driving ability is less affected. Experienced drinkers with high tolerance can be functionally dangerous on the road at 0.10% while feeling "fine."
The Honest Answer: It Depends on You
Whether you can legally drive after 4 Drinks depends on your weight, gender, how fast you drank, how long ago you started, and what you ate. For many people — particularly lighter women or those who drank quickly — 4 Drinks is enough to cross the legal limit. For heavier men who drank slowly over several hours, it may not be. The chart above gives you a personalized estimate. Use it honestly.
Frequently Asked Questions
Can police tell you've had 4 Drinks from a breathalyzer?
A breathalyzer measures BAC, not number of drinks or what you consumed. If your BAC is 0.08% or higher, you can be arrested regardless of how many drinks you think you had. There is no way to "mask" alcohol on a breathalyzer — mints, gum, and coffee do not lower your BAC reading.
What's the maximum BAC you can drive with legally?
In all 50 U.S. states, the legal limit for drivers 21+ is 0.08% BAC. Commercial drivers (CDL) face a 0.04% limit. Drivers under 21 face zero-tolerance laws ranging from 0.00% to 0.02% depending on state. In many states you can also be convicted of DUI at BAC below 0.08% if an officer observes driving impairment — it's called DWI (driving while impaired) or DWAI (driving while ability impaired).
How do I know if I'm safe to drive?
The most reliable method (besides not drinking) is a personal breathalyzer. BACtrack breathalyzers are FDA-cleared and police-grade accurate. Short of that, use the BAC calculator or chart above, wait longer than you think you need to, or take a rideshare. The cost of an Uber is orders of magnitude less than the cost of a DUI.