What Is the EtG Detection Time Calculator?
Ethyl glucuronide (EtG) is a direct metabolite of alcohol that the body produces only after alcohol is consumed. Because it lingers far longer than alcohol itself, EtG urine tests are widely used in abstinence monitoring programs, probation, and treatment settings. This calculator gives a rough estimate of how long EtG may remain detectable in urine based on the number of standard drinks consumed.
How to Use It
Enter the number of standard drinks you consumed in a single session. A "standard drink" is roughly 14 g of pure alcohol — about a 12 oz beer, a 5 oz glass of wine, or 1.5 oz of spirits. The calculator multiplies drinks by an approximate per-drink clearance factor and caps the result at the commonly cited ~80-hour maximum detection window seen after heavy drinking.
The Formula Explained
Detection time (hours) \(\approx\) Standard Drinks \(\times 4.5\), limited to a maximum of 80 hours.
$$\text{Detection Time (hours)} = \min\left(\text{Standard Drinks} \times 4.5,\ 80\right)$$Light drinking (1–2 drinks) typically clears EtG within roughly 24 hours, moderate drinking within 1–2 days, and heavy drinking can remain detectable up to 3–5 days depending on test sensitivity, hydration, metabolism, and kidney function.
Worked Example
Suppose you had 6 standard drinks. The estimate is $$6 \times 4.5 = 27 \text{ hours},$$ or about 1.13 days. For 20 drinks, $$20 \times 4.5 = 90 \text{ hours},$$ which is capped at 80 hours (~3.3 days), reflecting the typical upper limit of the EtG detection window.
FAQ
How accurate is this estimate? It is a simplified educational model. Real detection depends on test cutoff (100, 250, or 500 ng/mL), individual metabolism, body water, and frequency of drinking.
Can EtG be detected after just one drink? Yes — sensitive tests can detect EtG for a day or more even after a single drink, which is why these tests are used for strict abstinence monitoring.
Does drinking water flush out EtG faster? Hydration can dilute a urine sample but does not meaningfully speed clearance; labs check for dilution. Do not rely on this tool to pass a test.
