EtG Calculator – Alcohol Detection Time Estimator
Estimate a possible urine EtG detection window after alcohol use. This private browser-based calculator gives an educational range estimate only and cannot predict a certified laboratory result.
This is an educational range estimate only. It cannot predict whether a certified laboratory test will be positive or negative. Urine EtG cannot be predicted precisely from drinks alone.
Methodology & Sources
This calculator uses a simplified educational range model based on standard drinks, drinking duration, time since last drink, body weight, biological sex for estimate, and the selected EtG cutoff level.
It does not estimate your true laboratory EtG concentration. Results can vary by cutoff level, lab method, timing, urine concentration, and individual factors.
Model assumptions
How This EtG Calculator Works
Enter alcohol-use details
Add the number of standard drinks, drinking duration, and time since your last drink.
Choose a cutoff level
Compare the estimate against 100, 300, or 500 ng/mL cutoff levels.
Review the model range
The calculator places your estimate below, near, or above the selected cutoff range.
Read the limitations
No online calculator can predict a certified laboratory result. Use the estimate for education only.
EtG Cutoff Levels Explained
100 ng/mL Cutoff
More sensitive cutoff
A lower cutoff is more sensitive and may detect lower EtG levels. It can create a longer estimated detection window.
300 ng/mL cutoff
Mid-range cutoff
A middle cutoff may be used to reduce some low-level detection concerns while still identifying recent alcohol exposure.
500 ng/mL cutoff
Common confirmation cutoff
A higher cutoff is commonly discussed in confirmation contexts. It may show a shorter estimated window than lower cutoffs.
EtG Detection Window Chart
This visual curve is a simplified educational model. It does not represent a certified laboratory result.
This chart does not show exact EtG concentration, estimated peak, or exact clearance time.
Why EtG Calculator Results Can Vary
No online EtG calculator can predict a certified lab result.
EtG detection is affected by more than the number of drinks. Cutoff level, timing, lab method, urine concentration, metabolism, health factors, and individual variation can all change how long EtG may be detected.
That is why this tool uses broad educational ranges instead of exact pass/fail predictions.
Results may vary because of
Factors That Affect EtG Detection Time
Amount of alcohol
More alcohol generally increases the possible detection window.
Time since last drink
More time usually lowers estimated detection risk, but no exact timing can be guaranteed.
Drinking duration
Longer drinking sessions may affect the estimated range.
Body weight and biological sex
These inputs help the model create a broad estimate, but they cannot predict lab results.
Cutoff level
Lower cutoff levels can increase the estimated detection window.
Testing method
Laboratory methods and sample conditions can affect interpretation.
EtG detection time chart
Frequently asked questions
What is an EtG test?
EtG (ethyl glucuronide) is a direct metabolite of alcohol. Urine EtG tests can detect alcohol use for up to 80 hours after consumption, making them one of the most sensitive alcohol biomarkers available.
Is this a free EtG calculator?
Yes. This calculator is free to use and runs in your browser without signup.
How accurate is this calculator?
This calculator provides an educational range estimate based on published EtG studies. Individual results vary based on hydration, kidney function, metabolism, and other biological factors. It cannot predict a certified laboratory result.
What is a standard drink?
A standard drink contains approximately 14 grams of pure alcohol. That’s roughly one 12 oz beer (5% ABV), one 5 oz glass of wine (12% ABV), or one 1.5 oz shot of spirits (40% ABV)
Can incidental exposure trigger a positive?
At the 500 ng/mL cutoff, incidental exposure (hand sanitizer, mouthwash) is unlikely to trigger a positive. At the more sensitive 100 ng/mL cutoff, some studies have shown possible positives from heavy incidental exposure.
What factors affect EtG elimination?
Key factors include body weight, biological sex, hydration level, kidney function, liver health, and the amount and duration of alcohol consumption.
What cutoff level does my test use?
Common cutoffs are 500 ng/mL (SAMHSA confirmation), 300 ng/mL (mid-range), and 100 ng/mL (most sensitive). Check with your testing provider for the specific threshold used.