Blood Alcohol Content (BAC) Calculator « Celtic Kane Online
Celtic Kane

Blood Alcohol Content (BAC) Calculator

Determined Total Consumed Alcohol

Percent Alcohol:
Total Servings:
Total Raw Alcohol:
0

ounces
Determine Your Tolerance
Weight:
  Pounds  
Kilograms
Sex:
Metabolic Rate:
Elapsed Time: hour(s),
minute(s)
Results
Your estimated BAC is not available yet
Your estimated time to drive is not available yet
Your estimated time until sober is not available yet

BAC Chart Values

.00 - .05 - Normal behavior, no impairment, mostly sober

.05 - .10 - Possibly buzzed, euphoria, lessened inhibitions

.10 - .15 - Lightly drunk, feeling good, smiling

.15 - .20 - Definitely drunk, possibly an upset stomach

.20 - .30 - Confused, nauseated, feels shitty

.30 - .35 - Throwing up, passing out, falling over

.35 - .40 - Way too drunk, coma

Anything over .40 - Way, way too drunk -- death

Notes

  • When typing in a custom percent alcohol, keep in mind that the proof of an alcohol is about double the percent (ie - 80 proof alcohol is 40%)
  • If you're typing in a mixed drink, only count the number of shots you put in -- not the drink's total volume
  • It's impossible to be extremely accurate in estimating a BAC -- everyone is different
  • Being legal to drive assumed you are 21 years old and the legal limit is .08
  • All calculations are based on the math presented by the US Department of Transportation. Please visit this website if you'd like to see the logic behind the math, or even if you want more details regarding the calculations.

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  1. celtickane
    April 9, 2009

    Please note that I just made a bugfix to the Javascript — the calculator was making an incorrect conversion to kilograms (if kilograms were selected). The bug is fixed now.

  2. not right
    April 9, 2009

    4 typical mixed drinks in one hour = 0.451?

    no.

  3. celtickane
    April 9, 2009

    Depends on how strong the drink is. If you’ll note the percent alcohol, you have to type in the number of shots into the drink, not the actual volume of the drink. For example, if you had a “typical mixed drink” with 2 shots, you’d type in (2) single shot(s), rather than the entire volume of your mixed drink.

  4. celtickane
    April 9, 2009

    I removed ‘typical mixed drink’ from the drinks list — it was unclear whether you add the volume of the mixed drink or the volume of the alcohol added. To calculate mixed drinks, just add in the volume of alcohol added.

  5. LegalEagle
    April 9, 2009

    You should amend this program to account for different laws in different countries. The legal limit in many parts of the world is 0.05, not 0.08 like in the USA, so you could be liable for a lawsuit for giving misleading information in the “time until you can drive” column. Failing that, you need to add a legal disclaimer.

  6. frank
    April 9, 2009

    Inaccurate. Th heavier the drinker you are the slower alcohol metabolizes in your system. You won’t *feel* drunk sooner because of higher tolerance.

  7. Sir Drinksalot
    April 9, 2009

    Great calculator, good layout

    *** IF YOU COULD MAKE THIS AN APPLICATION FOR SMART PHONES ***
    You could make thousands and thousands of dollars.

  8. celtickane
    April 9, 2009

    While it is true that alcohol tolerance increases, the hepatic metabolism of alcohol also increases. Over time, a heavy drinker will be able to clear more alcohol per hour than a normal drinker because a heavy drinker’s liver will induce more enzymes to break down alcohol.

  9. Kevin
    April 9, 2009

    genius

  10. sara
    April 13, 2009

    hear, hear!!!

  11. Nathaniel
    May 22, 2009

    Great page. Could you go into more detail on the metabolic rates you have listed to choose from. Can the human body actually metabolize alcohol that fast ie: “frat boy”

  12. AA :D
    June 19, 2009

    Hi,

    My company does occasional breathalyser checks, due to 0.00% tolerance.

    A mail was sent out today, regarding someone being fired because they were 0.25% over the limit. However, they didn’t say which unit of measurement was used. Is B.A.C always used for breath tests ?

    Thanks,
    Chris

  13. sal
    July 25, 2009

    This is the best! It may be inaccurate in many ways but generally it gives a good idea to people who have no idea how drunk they are. It is also useful if you are planning to get drunk and want to know how much to drink to get the desired feeling. Which may sound stupid but it stops overdoses.

    Thanks for this

  14. Casey J Putnam
    July 27, 2009

    This bac calcutator is fairly competant.The best online calculator I have seen is The fatal vision bac, were they calculate your bac and then give you a graph of the time you started drinking,to the time you will be completly sober

  15. Happy
    August 6, 2009

    Very impressive. I was originally tempted to agree with the fellow who said that your tolerance doesn’t affect your BAC. A high tolerance makes you more in control at a high BAC, but I didn’t know that the metabolism develops to process alcohol faster for regular drinkers. The veracity of the calculator can by seen by choosing “0″ as the time. Then the BAC result IS independent of tolerance selection.

    I’m working on some drinking related tools too. I have a long ways to go to reach your level of sophistication. Thanks for linking to the math. – Happy

  16. joe
    August 13, 2009

    I think the calculator is great and very acccurate. I think a question section for answers would be great. the calculator is good for drinks. what if you have a meal in the middle? If food slows down the ingestion of alcohol into the system, how do you use the calculator?

  17. Chadius DelGraco
    September 6, 2009

    I have access to a PBT (personal breath tester) and I will say this is the best calculator I’ve found online. The results are with in .013 of the actual tester…also I am always sober before the weekend warrior (ave drinker) should be. Maybe I need to up my level to the next one? lol

    Thanks for the great calculator…

    Chadius DelGraco

  18. bowlkilla
    December 15, 2009

    I was wondering if the amount of 1 shot is considered 1.5 oz of hard liquor for this calculator?

  19. celtickane
    December 15, 2009

    Yes, 1.5 ounces of hard liquor is one shot.

  20. Laura
    December 20, 2009

    Hi,
    I’m just wondering if you know of how a drug like Clonazepam (it’s supposed to ‘taper’ down BALs by competing with the breaking down of alcohol) factors in. If you know of any info on this please post.

  21. celtickane
    December 22, 2009

    The metabolism of clonazepam and ethanol/alcohol are completely different — clonazepam does not interfere with the breakdown of alcohol. Benzodiazepines, like clonazepam, can be used to prevent alcohol withdrawal because they both work in a similar way (GABA receptor).
    If clonazepam is taken with alcohol, it won’t affect the BAL, but it will increase the effect of both drugs (e.g. increased sedation and decreased coordination). In other words, taking both together isn’t a good idea.

  22. Frat Boy
    December 22, 2009

    How many onces are in a kraft of wine. and how do you calculate if you drink two different items in the same time frame, like wine and shnopps.

  23. Robert
    January 4, 2010

    This is the best BAC calculator I’ve seen, for sure!

    How does weight work, though? I can see why there would be a difference between smaller and larger people, but what if the weight difference is from fat and not inherent body size? You hear around gyms that fat isn’t “metabolically active,” but does it count for BAC calculations?

  24. Laura
    January 14, 2010

    There is a guy whose living with a female alcohic (she’s light so I entered 120 pounds). He says she drinks a 750ml of Vodka a day and has been doing it for 7 days straight. So I entered 16.9 times 7 and 168 hours. The interesting thing is that for an alcoholic the BAC comes out to be 0. But for a heavy drinker the BAC comes out to be 1.64. Is this a bug, then?

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