ETG calculator, ETG test calculator & EtG alcohol calculator — how this tool works
People searching for an ETG calculator, ETG test calculator, or EtG alcohol calculator want a plain-English estimate of ethyl glucuronide in urine after drinking. This page is that tool: it models ETG from standard drinks and elapsed time, then compares the estimate with the 100, 300, and 500 ng/mL cutoffs used by many labs and monitoring programs.
What is ETG (ethyl glucuronide)?
ETG is a direct metabolite of ethanol. It can remain detectable in urine after alcohol itself is gone, which is why probation, treatment, and some workplace programs use ETG panels instead of a breathalyzer. This calculator does not measure your sample — it applies a published-style biphasic decay model (about a 3.5-hour fast phase and a 9-hour slow tail) so you can see how cutoff and timing change the picture.
How to use this ETG alcohol calculator
Enter standard drinks (about 14 g ethanol each), hours spent drinking, hours until the test (or a test date), body weight, sex, your program's cutoff, and hydration. The live panel shows estimated ETG at test time, peak ETG, a decay chart, and all three common cutoffs. For hours-until-clear, open the ETG Detection Time Calculator. For several drinking sessions, use the Advanced ETG Calculator.
100 vs 300 vs 500 ng/mL
A 100 ng/mL cutoff is the strictest and stays positive longest. 300 and 500 ng/mL are widely used clinical/forensic thresholds. Always match the cutoff written in your program rules — guessing the wrong cutoff is the most common mistake with any ETG test calculator. Dedicated cutoff notes below share this page’s canonical URL so explanation stays in one place.
ETG 100 ng/mL calculator view
Choose 100 ng/mL in the cutoff control above for a strict abstinence-style panel. In CalcGrain’s biphasic model, light-to-moderate drinking often remains above this line into roughly the 45–72 hour range. Use this setting when your paperwork names a 100 ng/mL ETG calculator threshold — not a more lenient clinical cutoff.
ETG 300 ng/mL calculator view
Select 300 ng/mL for a common clinical and monitoring cutoff. The same drinks that still fail 100 ng/mL may already sit under 300 ng/mL. Many “how long does ETG stay in urine” answers in this model land around 24–45 hours for light-to-moderate intake at 300 ng/mL.
ETG 500 ng/mL calculator view
Pick 500 ng/mL when your lab or program uses that forensic-style line. It typically clears sooner than 100 or 300 ng/mL after the same session. Confirm the number on your chain-of-custody form before trusting any ETG 500 ng/mL calculator estimate.
ETG calculator FAQ
Is this the same as an ETG test calculator?
Yes. ETG calculator, ETG test calculator, and EtG alcohol calculator all refer to estimating urine ETG after drinking. CalcGrain's tool is a free estimator, not a laboratory assay.
How long does ETG stay in urine?
In this model, light-to-moderate drinking often clears 300 ng/mL in roughly 24–45 hours; 100 ng/mL may take roughly 45–72 hours. Heavier intake lasts longer. Individual metabolism, liver/kidney function, and hydration change real lab results.
What is an ETG 100 ng/mL calculator used for?
It is this same tool with the 100 ng/mL cutoff selected — a sensitive abstinence panel. Jump to the 100 ng/mL notes and set the cutoff control to 100.
What is the difference between 300 and 500 ng/mL ETG cutoffs?
Both are common clinical/forensic thresholds. 300 ng/mL stays positive longer than 500 ng/mL after the same drinks. Match the cutoff your program prints; see 300 and 500.
Does hydration change an ETG calculator result?
The model includes a hydration control because dilute urine can change measured ng/mL and may be flagged by labs (low creatinine). Extra water does not speed true elimination.
Can one beer fail an ETG test?
On a 100 ng/mL panel, even small amounts can remain detectable for a day or more in population models. Cutoff and hours since the last drink matter more than the label “one beer.”
Is this ETG calculator a lab report?
No. It applies a published-style biphasic decay model (about a 3.5-hour fast phase and a 9-hour slow tail). Only a laboratory assay of your sample is a test result.
Can this calculator beat or pass an ETG test?
No. Do not use it to try to influence a test. Labs can flag dilute samples. Output is educational only — not medical or legal advice.
Which related CalcGrain tool should I open next?
Use the ETG Detection Time Calculator for hours-until-clear at all three cutoffs, or the Advanced ETG Calculator for more than one drinking session.
Disclaimer: Educational estimates only — not legal, medical, or insurance advice. CalcGrain is a driving-points and ETG calculator website; it is not related to MATLAB MTEX or materials-science grain reconstruction.