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BAC Calculator

Use this BAC calculator to review an educational health calculation for BAC. The page returns estimated BAC plus supporting values for BAC before elimination, average elimination applied, and standard drinks used.

Primary answer
Estimated BAC
Inputs to verify
Standard drinks, Body weight, and Weight unit
Use type
Use as a review-only estimate; verify before relying on it.
Keyword intent
BAC calculator

Calculator

BAC Calculator

Calculates estimated bac from standard drinks, body weight, weight unit. Defaults are filled in so you can review a working example before changing inputs.

drinks

One U.S. standard drink contains 14 grams of pure alcohol.

Use pounds when weight unit is lb, or kilograms when weight unit is kg.

Choose pounds or kilograms.

Choose the published simplified Widmark distribution coefficient used for the estimate.

hours

Elapsed hours since drinking began; this uses an average elimination estimate.

Result

Result reflects the current submitted inputs.

  • Risk C
  • Reviewed 2026-05-26
  • 5 sources
Estimated BAC0.035 g/dL
BAC before elimination0.05 g/dL
Average elimination applied0.015 g/dL
Standard drinks used2 drinks
Safety noteEstimate only. Do not use BAC estimates to decide whether driving or any safety-sensitive activity is safe or legal.

Breakdown

Alcohol modeled
28 g
Weight used
81.6466 kg
Widmark coefficient
male
  • This calculator is an educational estimate and is not legal, medical, or safety advice.
  • One U.S. standard drink is modeled as 14 grams of pure alcohol.
  • The simplified Widmark coefficients are 0.68 for male coefficient and 0.55 for female coefficient.
  • Average elimination is modeled as 0.015 g/dL per hour, but real metabolism varies.
  • Do not use this result to decide whether to drive, operate equipment, or do any safety-sensitive activity.

Accuracy notes

Risk level
C
Reviewed
2026-05-26
Sources
5
Primary result
Estimated BAC

Formula logic is kept in a pure calculator module with fixtures, source notes, and page-visible assumptions.

High-risk estimate

Educational estimate, not advice

This health calculator is for educational estimates only. It does not diagnose, treat, provide medical clearance, or replace advice from a qualified health professional.

Check the reviewed sources, assumptions, and formula limits before using this result for a financial, health, or safety decision.

Review cadence: 12 months; next review due 2027-05-26.

Categories

What the result means

Estimated BAC is the number to carry forward from this BAC calculation. Estimated BAC after average elimination, floored at zero. Treat the result as educational context, then read the limitations and assumptions before discussing it with a professional. Use BAC before elimination, average elimination applied, and standard drinks used to explain why estimated BAC moved when an input changed. Record the inputs you used and verify any health concern with a qualified professional.

Estimated BACEstimated BAC after average elimination, floored at zero.
BAC before eliminationSimplified Widmark estimate before elapsed-time subtraction.
Average elimination appliedAverage elimination amount subtracted from the Widmark estimate.
Standard drinks usedUser-entered U.S. standard drink count.

Use the result this way

  1. Start with Estimated BAC, then use supporting outputs only to explain the primary answer.
  2. Verify standard drinks, body weight, and weight unit before copying the result.
  3. Choose the mode or method first because it can change which formula is applied, keep units consistent with the labels shown in the form, and stay within the documented minimum and maximum ranges.
  4. Record the inputs you used and verify any health concern with a qualified professional.

User job

How to use this calculator

Use BAC Calculator when you need estimated bac, then use bac before elimination and average elimination applied to check the context for general wellness education and preparing for a professional conversation.

Best for

  • Understanding a formula-based estimate
  • Seeing which inputs drive a health-related output
  • Reviewing a default example before entering your own standard drinks and body weight.

Check before relying

  • Health formulas can be population-specific; do not use the result as diagnosis or treatment advice.
  • This calculator is an educational estimate and is not legal, medical, or safety advice.
  • One U.S. standard drink is modeled as 14 grams of pure alcohol.
  • Source context: Centers for Disease Control and Prevention, reviewed 2026-05-26.

Next useful step

  • Body Fat CalculatorUse next when you need estimated body fat from age and sex used by equation after checking estimated BAC.
  • Lean Body Mass CalculatorUse next when you need estimated lean body mass from age and sex used by equation after checking estimated BAC.
  • One Rep Max CalculatorUse next when you need estimated 1RM from weight lifted and weight unit after checking estimated BAC.

Limits of this estimate

  • Supports educational BAC estimation only; it excludes legal impairment determinations, individual metabolism, food, medication, health status, drink measurement error, and any driving or safety decision.
  • The result depends on user-entered inputs and the documented assumptions; defaults are examples only.
  • Search indexing approval does not downgrade this page from risk level C or turn the result into professional advice.

Formula

Estimated BAC uses a simplified Widmark grams formula from U.S. standard drinks, body weight, sex-based distribution coefficient, and average elapsed-time elimination. Key assumptions: This calculator is an educational estimate and is not legal, medical, or safety advice. One U.S. standard drink is modeled as 14 grams of pure alcohol. The simplified Widmark coefficients are 0.68 for male coefficient and 0.55 for female coefficient.

  • Estimated BAC uses a simplified Widmark grams formula from U.S. standard drinks, body weight, sex-based distribution coefficient, and average elapsed-time elimination.
  • This calculator is an educational estimate and is not legal, medical, or safety advice.
  • One U.S. standard drink is modeled as 14 grams of pure alcohol.
  • Primary source context: Centers for Disease Control and Prevention.

Inputs

Enter standard drinks, body weight, weight unit, and widmark coefficient for general wellness education and preparation for a professional conversation. Before calculating, choose the mode or method first because it can change which formula is applied, keep units consistent with the labels shown in the form, and stay within the documented minimum and maximum ranges. Standard drinks: One U.S. standard drink contains 14 grams of pure alcohol. Body weight: Use pounds when weight unit is lb, or kilograms when weight unit is kg. Weight unit: Choose pounds or kilograms. Widmark coefficient: Choose the published simplified Widmark distribution coefficient used for the estimate.

Standard drinksOne U.S. standard drink contains 14 grams of pure alcohol.
Body weightUse pounds when weight unit is lb, or kilograms when weight unit is kg.
Weight unitChoose pounds or kilograms.
Widmark coefficientChoose the published simplified Widmark distribution coefficient used for the estimate.
Hours since first drinkElapsed hours since drinking began; this uses an average elimination estimate.

Example

Using the default inputs, BAC Calculator returns estimated BAC of 0.035 g/dL. Adjust standard drinks, body weight, weight unit, and widmark coefficient to match your own scenario.

FAQ

How is estimated BAC calculated here?

Estimated BAC uses a simplified Widmark grams formula from U.S. standard drinks, body weight, sex-based distribution coefficient, and average elapsed-time elimination. The first assumption to check is: This calculator is an educational estimate and is not legal, medical, or safety advice.

What does Estimated BAC mean for BAC?

Treat the result as educational context, then read the limitations and assumptions before discussing it with a professional. Secondary values such as BAC before elimination, average elimination applied, and standard drinks used are there to explain the primary answer, not to replace it.

What should I enter for Standard drinks?

One U.S. standard drink contains 14 grams of pure alcohol. Use drinks for this field. Choose the mode or method first because it can change which formula is applied, keep units consistent with the labels shown in the form, and stay within the documented minimum and maximum ranges.

How does Body weight change estimated BAC?

Use pounds when weight unit is lb, or kilograms when weight unit is kg. Changing it can alter estimated BAC because the formula uses the submitted inputs together. Also compare measurement method, formula population, age range, units, sex or activity assumptions, and clinical context.

Why does the BAC example show 0.035 g/dL for estimated BAC?

The default inputs produce 0.035 g/dL for estimated BAC. Treat that as a format and scale check, then replace every default value with your own inputs.

Can the BAC result diagnose or prescribe anything?

No. Use it as educational context only. Health formulas can depend on population, measurement method, age range, and clinical context.

Sources

Last reviewed: 2026-05-26

  • officialReviewed 2026-05-26 · Source 2024-12-12
    About Standard Drink SizesCenters for Disease Control and Prevention. Alcohol grams input conversion from user-entered standard drinks.
    Scope
    Official CDC explanation of U.S. standard drink sizes and 14 grams of pure alcohol per standard drink.
    Supports
    Alcohol grams input conversion from user-entered standard drinks.
    Limits
    Supports educational BAC estimation only; it excludes legal impairment determinations, individual metabolism, food, medication, health status, drink measurement error, and any driving or safety decision.
  • officialReviewed 2026-05-26 · Source Undated page, accessed 2026-05-26
    Impaired DrivingCenters for Disease Control and Prevention. Safety disclaimer and refusal to make driving/legal conclusions.
    Scope
    Official CDC impaired-driving page explaining BAC and warning that impairment starts below common legal limits.
    Supports
    Safety disclaimer and refusal to make driving/legal conclusions.
    Limits
    Supports educational BAC estimation only; it excludes legal impairment determinations, individual metabolism, food, medication, health status, drink measurement error, and any driving or safety decision.
  • officialReviewed 2026-05-26 · Source 2023-04
    Preliminary Training for the Drug Evaluation and Classification Program - Participant ManualNational Highway Traffic Safety Administration. Average elapsed-time elimination rate and safety limitations.
    Scope
    Official NHTSA training material that states average BAC drop due to metabolism is about 0.015 per hour.
    Supports
    Average elapsed-time elimination rate and safety limitations.
    Limits
    Supports educational BAC estimation only; it excludes legal impairment determinations, individual metabolism, food, medication, health status, drink measurement error, and any driving or safety decision.
  • officialReviewed 2026-05-26 · Source Undated page, accessed 2026-05-26
    Widmark's EquationWashington State Patrol Breath Test Program. Choice of Widmark equation structure and high-risk forensic limitations.
    Scope
    State forensic reference material explaining Widmark variables, body weight, distribution constant, BAC, elimination rate, and elapsed time.
    Supports
    Choice of Widmark equation structure and high-risk forensic limitations.
    Limits
    Supports educational BAC estimation only; it excludes legal impairment determinations, individual metabolism, food, medication, health status, drink measurement error, and any driving or safety decision.
  • officialReviewed 2026-05-26 · Source 2020
    Prevalence of Hangover Resistance According to Two Methods for Calculating Estimated Blood Alcohol ConcentrationAlcohol and Alcoholism / PubMed Central. Secondary confirmation of simplified grams-based Widmark coefficients and formula variables.
    Scope
    Peer-reviewed article describing eBAC using Widmark formula, grams consumed, body weight, sex-based r values, and degradation rate.
    Supports
    Secondary confirmation of simplified grams-based Widmark coefficients and formula variables.
    Limits
    Supports educational BAC estimation only; it excludes legal impairment determinations, individual metabolism, food, medication, health status, drink measurement error, and any driving or safety decision.

Disclaimer

This health calculator is for educational estimates only. It does not diagnose, treat, provide medical clearance, or replace advice from a qualified health professional.