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Side-by-side comparison helps you choose the right calculator for a specific clinical question.

Tool ATool B

BAC Calculator

Clinical

Estimate blood alcohol concentration (BAC) from standard drinks, body weight, sex, and time since drinking started using a Widmark-style model. Screen for alcohol use disorder with [AUDIT](/tools/audit) or [CAGE Questionnaire](/tools/cage).

Formula

Widmark-style estimate: BAC from alcohol grams, body-weight distribution factor, minus time-based elimination

Inputs

Standard Drinks
Body Weight
Sex
Hours Since First Drink

FAQs: 4

Open tool

AUDIT

Mental Health

Screen for hazardous and harmful alcohol use with the 10-question AUDIT. Scores range from 0 to 40 across four risk zones. For quick screening use [CAGE](/tools/cage).

Formula

Total score = sum of all 10 items. Range 0-40.

Inputs

How often do you have a drink containing alcohol?
How many drinks on a typical drinking day?
How often do you have 6 or more drinks on one occasion?
How often in the past year could you not stop drinking once started?
How often in the past year have you failed to do what was expected because of drinking?
How often in the past year have you needed a drink in the morning to get going?
How often in the past year have you felt guilt or remorse after drinking?
How often in the past year could you not remember what happened while drinking?
Have you or someone else been injured because of your drinking?
Has a relative, friend, or health worker suggested you cut down on drinking?

FAQs: 15

Open tool

Compare Medical Tools

Side-by-side comparison helps you choose the right calculator for a specific clinical question.

BAC Calculator

Clinical

Formula

Widmark-style estimate: BAC from alcohol grams, body-weight distribution factor, minus time-based elimination

Inputs

Standard Drinks
Body Weight
Sex
Hours Since First Drink

FAQs: 4

Open tool

AUDIT

Mental Health

Screen for hazardous and harmful alcohol use with the 10-question AUDIT. Scores range from 0 to 40 across four risk zones. For quick screening use [CAGE](/tools/cage).

Formula

Total score = sum of all 10 items. Range 0-40.

Inputs

How often do you have a drink containing alcohol?
How many drinks on a typical drinking day?
How often do you have 6 or more drinks on one occasion?
How often in the past year could you not stop drinking once started?
How often in the past year have you failed to do what was expected because of drinking?
How often in the past year have you needed a drink in the morning to get going?
How often in the past year have you felt guilt or remorse after drinking?
How often in the past year could you not remember what happened while drinking?
Have you or someone else been injured because of your drinking?
Has a relative, friend, or health worker suggested you cut down on drinking?

FAQs: 15

Open tool