How Many Foster'ss to Get Drunk?
Alex Harmon · Updated June 2026 · Widmark Formula
One Foster's contains 2.12 standard drinks worth of alcohol (5.0% ABV, 25.4 fl oz = 29.6g pure ethanol). The table below shows your estimated BAC based on how many Foster'ss you've had — calculated using the Widmark formula, the same method used by courts and law enforcement.
BAC Table for Foster's
Select your gender — women reach higher BAC due to lower body water ratio and r-factor (0.66 vs 0.73 for men).
Assumes drinks consumed in a short window, 0 hours elapsed. Subtract 0.015% per hour since your first drink.
🧮 Use the Real-Time BAC Calculator — enter your exact drinks →When Do You Hit 0.08%?
At 0.08% BAC you are legally impaired in all 50 states — a DUI conviction is possible even if you feel fine. Here's the approximate number of Foster'ss needed to cross the legal limit:
120 lb male: ~0.6 Foster'ss |
120 lb female: ~0.6 Foster'ss
160 lb male: ~0.9 Foster'ss |
160 lb female: ~0.8 Foster'ss
200 lb male: ~1.1 Foster'ss |
200 lb female: ~1.0 Foster'ss
Remember: these are estimates. Food, speed of drinking, medications, and individual metabolism all affect real BAC. The only way to know for sure is a breathalyzer.
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Frequently Asked Questions
Does Foster's get you drunk faster than regular beer?
Foster's is 5.0% ABV. Each can contains 2.12 standard drinks, so the rate of intoxication depends on how many you drink and how fast, not the brand name itself. The BAC formula above accounts for exact ABV.
Does food slow down getting drunk from Foster's?
Yes — eating before or while drinking significantly slows alcohol absorption, potentially reducing peak BAC by 30–50%. Food doesn't eliminate alcohol; it slows how quickly it enters your bloodstream. The table above assumes drinking on an empty stomach and represents a worst-case estimate.
How long does Foster's stay in your system?
Your liver clears roughly 0.015% BAC per hour regardless of what you do. If you had 3 Foster'ss and are a 160 lb male, your estimated starting BAC is 0.279%. At 0.015%/hr, that takes approximately 18.6 hours to reach 0.00%. Coffee, water, and food won't speed this up.
Can a breathalyzer detect Foster's differently than other drinks?
No. Breathalyzers measure blood alcohol content — ethanol is ethanol regardless of whether it came from Foster's, wine, or spirits. There is no test that can tell what kind of alcohol you consumed, only how much is in your blood.