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Blood Alcohol Content Calculator

Emergency Notice: If BAC exceeds 0.30%, seek immediate medical attention. Never drive after drinking.

Personal Information

Step 1 of 3

Biological sex affects alcohol metabolism rate

Enter your current body weight

Must be 21 or older

Food slows alcohol absorption

Beverage Tracking

Step 2 of 3

When did you have your first drink?

Quick Add Drinks

Drink History

Total: 0 Standard: 0.0

No drinks added yet

Click the drink buttons above to start tracking

BAC Level Effects

0.00 - 0.02% Safe
  • No loss of coordination
  • Slight mood elevation
  • Normal behavior
0.03 - 0.06% Mild
  • Mild euphoria and relaxation
  • Slight impairment of judgment
  • Lowered inhibitions
0.07 - 0.10% Impaired
  • Impaired balance and motor control
  • Impaired judgment and self-control
  • Illegal to drive (0.08%+)
0.11 - 0.20% Intoxicated
  • Significant motor impairment
  • Loss of coordination
  • Potential memory blackouts
0.21 - 0.30% Dangerous
  • Severe motor impairment
  • Risk of unconsciousness
  • Risk of alcohol poisoning
0.31%+ Critical
  • Life-threatening
  • Risk of coma
  • Seek immediate medical help

Safety Guidelines

Transportation

Always arrange safe transportation before drinking. Use rideshare, taxi, or designated driver.

Eat First

Never drink on empty stomach. Food slows alcohol absorption significantly.

Hydration

Drink water between alcoholic beverages. Stay hydrated to reduce effects.

Pace Yourself

Limit to one standard drink per hour. Your liver can only process so much.

01
01
Blood Alcohol Content

Computes what your BAC might be on the drinks that you have taken, body weight, gender and time. Displays alcohol levels in real-time in a colour-coded safe driving scale.

02
02
Time Predictions

Displays when you'll reach the legal driving limit (0.08%) and complete sobriety. Visual timeline chart shows BAC reduction over the next 24 hours.

03
03
Drink Library

Beer, wine, shots and cocktails that can be selected in advance with the correct volume of alcohol in them. Special beverage custom drink builder including calculating the precise amount of ABV.

04
04
Safety Guidance

Detailed effects at each BAC level from mild impairment to dangerous intoxication. Built-in safety tips and warnings to help you make informed decisions about alcohol consumption.

Blood Alcohol Content Calculator

About Bondage Valley's BAC Calculator

 

 

real testimonials

What They
Say About Our
BAC Tool?

— Bernard Hutchinson
"Brilliant tool! After my retirement party got a bit out of hand last year, my wife insisted I find a way to monitor my drinking. This calculator is spot on - I tested it against the breathalyser at our local police station's open day and it was remarkably accurate. The drink buttons are large enough for my arthritic fingers and I love that it shows when I'll be safe to drive the next morning."
— Bernard Hutchinson
Newcastle
— Patricia Weatherby
"Very helpful indeed, though I did need my daughter to show me how to use it initially. I take medication for my heart, so I have to be careful with alcohol. This calculator helps me stay within safe limits at our weekly bridge club gatherings. The colour coding is excellent - green means I'm fine, orange means slow down."
— Patricia Weatherby
Brighton
— Ronald Chapman
"Absolutely first-rate! As a retired GP, I appreciate the medical accuracy of this calculator. The Widmark formula it uses is properly implemented and the metabolism rate is spot-on. I've recommended it to several friends at the golf club who were shocked to learn they were over the limit the morning after."
— Ronald Chapman
Oxford
— Doris Fletcher
"Such a sensible tool! My late husband was a publican, so I know the importance of drinking responsibly. This calculator has been a godsend for family gatherings - I can enjoy a glass or two of wine with Sunday lunch and know exactly when I'll be alright to take my evening medications. The preset drinks are handy, especially the wine option at 5oz, which is a proper serving."
— Doris Fletcher
Liverpool
— Stanley Morrison
"Started using this after a close call driving home from the Conservative Club last year - turned out I was still over the limit from the night before. Now I check this religiously. The time predictions are invaluable, especially for us pensioners who metabolise alcohol more slowly."
— Stanley Morrison
Edinburgh