About EtGCalc
EtGCalc is a private educational calculator for understanding estimated ethyl glucuronide levels, urine testing cutoffs, and alcohol metabolite detection windows.
Private by Design
Calculator inputs stay in your browser and do not require an account.
Science-Based Model
Estimates are based on published EtG kinetics and Widmark-style alcohol math.
Clear Limits
We state uncertainty clearly and do not promise test outcomes.
Our Mission
Our goal is to make EtG testing easier to understand. Many people encounter EtG testing through probation, treatment, workplace monitoring, or clinical settings and find only vague answers such as "up to 80 hours." EtGCalc explains the variables behind that estimate so users can understand the science and the uncertainty.
The site is not designed to replace professional guidance. If your test result has medical, legal, employment, or court consequences, consult the relevant professional instead of relying on a web calculator.
Methodology
- The calculator starts with standard drink inputs and body data to estimate alcohol exposure.
- It uses Widmark-style alcohol distribution assumptions to approximate peak exposure before projecting EtG decline.
- It compares modeled EtG levels with common urine testing cutoffs, especially 100 ng/mL and 500 ng/mL.
- All calculations run in your browser. We do not require an account and do not save calculator inputs.
Modeling note
EtG levels are estimated, not measured. The model gives a planning range around common cutoffs; it cannot account for every lab protocol or biological variable.
Limitations
- EtG metabolism varies with liver function, hydration, urine concentration, medications, drinking pattern, and individual biology.
- A calculator estimate is not a lab result and cannot guarantee a negative or positive test.
- Testing programs can use different specimen types, confirmation methods, and cutoff policies.
- This site is educational only and does not provide medical advice, legal advice, or test-evasion guidance.
Editorial Policy
We update educational content when new pages are added, when source material changes, or when users report a possible error. Corrections are reviewed against primary sources when possible, including government advisories, PubMed-indexed research, and lab interpretation guidance.
Medical or forensic reviewer attribution is not displayed unless a qualified person has actually reviewed the content and agreed to be named. A named reviewer program is planned, but not yet active. This page will be updated when that review process is in place.
Key Sources
SAMHSA Advisory: The Role of Biomarkers in the Treatment of Alcohol Use Disorders, 2012 Revision
Used for biomarker context, cutoff interpretation, and incidental exposure cautions.
Jatlow et al., Alcoholism: Clinical and Experimental Research, 2014
Used for urinary EtG and EtS kinetics after alcohol exposure.
McDonell et al., Drug and Alcohol Dependence, 2015
Used for EtG detection window context in clinical monitoring populations.
Questions About a Page?
Include the URL, what looks wrong, and any source we should review.
Contact EtGCalc