Alcohol EtG Calculator: From Drinks to Urine Levels
This alcohol EtG calculator translates standard drinks into estimated peak EtG levels and clearance time. It combines the Widmark formula with EtG decay kinetics to show how a specific drinking scenario may affect a urine test.
Editorial note
This educational page is maintained by EtGCalc and reviewed against published EtG research, SAMHSA guidance, and our calculator methodology. It does not provide medical or legal advice.
Enter Your Details
How to Use This Calculator
Enter your sex, weight, drink count, drink type, and time since your last drink. The calculator estimates your EtG level and compares it with common 100 ng/mL and 500 ng/mL cutoffs. For a broader explanation, read our EtG calculation guide.
1The Alcohol to EtG Pathway
After drinking, most alcohol is metabolized through the liver. A small portion is converted into direct biomarkers, including EtG. That metabolite can remain detectable after ethanol is no longer measurable.
The calculator estimates alcohol exposure first, then projects EtG formation and decay over time.
- Alcohol intake is converted to standard drinks
- Widmark math estimates peak exposure
- EtG decay estimates the remaining level
2Standard Drink Definitions
In the United States, one standard drink contains about 14 grams of pure alcohol. That equals roughly 12 oz of beer at 5% ABV, 5 oz of wine at 12% ABV, or 1.5 oz of liquor at 40% ABV.
If your pours are larger or stronger, the real standard-drink count may be higher than the number of glasses you remember.
Pour size matters
A double cocktail or high-ABV beer can count as more than one standard drink.
3Why Two People Get Different Results
Two people can drink the same amount and have different EtG estimates because body weight, biological sex, liver function, hydration, and drinking duration all change the model.
This is why a personalized calculator is more useful than a generic chart.
- Weight and body water
- Biological sex and Widmark factor
- Drinking speed and time since last drink
- Hydration and urine concentration
Drinks vs Estimated Window
| Scenario | Estimate | Context |
|---|---|---|
| 1 drink | Short window | Often below standard cutoff within a day |
| 2-3 drinks | Moderate window | Often cutoff dependent |
| 4-6 drinks | Longer window | May require more than 24 hours |
| 8+ drinks | Highest risk | Wide variation and longer tail |
Frequently Asked Questions
How many drinks are in a strong beer?
A large or high-ABV beer can contain more than one standard drink. Use ABV and volume when possible.
Does liquor create more EtG than beer?
EtG depends on total ethanol exposure, not the beverage type by itself.
Why does body weight matter?
Body weight affects alcohol distribution and peak BAC estimates, which feed the EtG model.
Can food change EtG levels?
Food can slow alcohol absorption, but it does not remove EtG once formed.
Is this private?
Yes. The calculator runs in your browser and does not require an account.
Other EtG Calculator Tools
Medical & Legal Disclaimer
Not Medical Advice
EtGCalc does not provide diagnosis, treatment, or medical advice. Talk with a qualified healthcare provider about alcohol use, metabolism, testing concerns, or recovery.
Not Legal Advice
EtG testing can affect probation, custody, licensing, and employment decisions. Consult a licensed attorney or your testing program for legal questions.
If You Need Support
In the United States, SAMHSA's National Helpline is 1-800-662-4357. It is free, confidential, and available 24/7.
Calculator output is an estimate, not a test prediction. Individual metabolism, hydration, kidney function, genetics, specimen handling, and lab cutoff policy can change real results. See our methodology and sources.
References
- 1SAMHSA. The Role of Biomarkers in the Treatment of Alcohol Use Disorders, 2012 Revision.
Used for biomarker context, cutoff interpretation, and incidental exposure cautions.
- 2Jatlow et al. Ethyl glucuronide and ethyl sulfate assays in clinical trials, 2014.
Used for urinary EtG and EtS kinetics after alcohol exposure.
- 3McDonell et al. Using ethyl glucuronide in urine to detect alcohol use, 2015.
Used for EtG detection window context in clinical monitoring populations.
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