BAC Chart

BAC Chart

Estimated BAC by weight, sex, and number of standard drinks

BAC Over Time — Example: 3 Beers (180 lb Male) 0.08% 0.00 0.02 0.05 0.08 0.15 0.25 BAC % 0h Start 1h 2h 3h 4h 5h 6h Time Since First Drink Peak: 0.063% BEER 1 BEER 2 BEER 3 SOBER SAFE LOW CAUTION DANGER ~0.015%/hour metabolism

The charts below show estimated BAC levels based on body weight and number of standard drinks consumed over one hour. These use the Deurenberg + Norberg method with average body composition for each weight class.

Important: These are population averages. Your actual BAC depends on your personal body composition, metabolism rate, food intake, and other factors. For a personalized estimate, use Alcophone.

Men — Estimated BAC (%)

Weight 1 drink 2 drinks 3 drinks 4 drinks 5 drinks 6 drinks
120 lbs 0.031 0.063 0.094 0.125 0.156 0.188
140 lbs 0.027 0.054 0.080 0.107 0.134 0.161
160 lbs 0.023 0.047 0.070 0.094 0.117 0.141
180 lbs 0.021 0.042 0.063 0.083 0.104 0.125
200 lbs 0.019 0.038 0.056 0.075 0.094 0.113
220 lbs 0.017 0.034 0.051 0.068 0.085 0.102
240 lbs 0.016 0.031 0.047 0.063 0.078 0.094

Women — Estimated BAC (%)

Weight 1 drink 2 drinks 3 drinks 4 drinks 5 drinks 6 drinks
100 lbs 0.045 0.091 0.136 0.181 0.227 0.272
120 lbs 0.038 0.075 0.113 0.151 0.189 0.227
140 lbs 0.032 0.065 0.097 0.129 0.162 0.194
160 lbs 0.028 0.057 0.085 0.113 0.142 0.170
180 lbs 0.025 0.050 0.076 0.101 0.126 0.151
200 lbs 0.023 0.045 0.068 0.091 0.113 0.136
220 lbs 0.020 0.041 0.061 0.082 0.102 0.123

BAC Risk Scale 0.00 0.02 0.05 0.08 LEGAL LIMIT 0.15 0.20+ SAFE LOW CAUTION DANGER SEVERE

Color Legend

■ Safe (0.00–0.02) Little to no impairment
■ Low (0.02–0.05) Mild relaxation, slight impairment
■ Caution (0.05–0.08) Impaired coordination and judgment
■ Danger (0.08–0.15) Legally impaired — do NOT drive
■ Severe (0.15+) Medical risk — seek help

Important Notes

  • One standard drink = 12 oz beer (5%), 5 oz wine (12%), or 1.5 oz spirits (40%)
  • These estimates assume drinks consumed within one hour with no prior metabolism
  • Actual BAC varies significantly based on body fat %, food intake, hydration, and individual metabolism
  • These charts use population averages — for a personalized estimate based on your body composition, use Alcophone
  • BAC continues to rise for 30–60 minutes after your last drink
  • Legal limit is 0.08% in most US states, 0.05% in Utah

Want a personalized estimate?

Alcophone calculates your BAC based on your specific body composition — not just population averages. Log your drinks and see your real-time BAC.

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These charts are averages. Alcophone gives you a personalized estimate.

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Alcophone provides BAC estimates only. It is not a breathalyzer and cannot measure your actual blood alcohol content. Never drive after drinking, regardless of what any app says. Must be 21+ to use. © 2026 SafeMetrics4U. All rights reserved.