Three cutoffs, one view
Compare 100, 200, and 500 ng/mL instead of assuming every lab uses the same threshold.
Understand cutoffs → Free · Private · Evidence-informed
EtG calculator for a clearer urine detection window
Use this free EtG calculator to explore research-informed urine detection ranges across 100, 200, and 500 ng/mL cutoffs. No signup, no stored answers, and no misleading “guaranteed pass” result.
✓ Runs locally✓ 3 cutoffs✓ Sources shown
EtG urine calculator
A clearer estimate in under a minute
Enter what you know. We’ll show a range, not a false promise.
100–500ng/mL cutoffs compared
0personal answers stored
4uncertainty factors explained
2026research sources checked
Why this tool is different
Useful context, without pretending biology is exact
Urine EtG varies too much for a responsible calculator to promise a precise concentration. We translate research into an understandable range and show what could move it.
Ranges instead of fake precision
See an earlier-to-later window and the factors that create uncertainty around your result.
Read the methodology →Private by default
Your entries and result remain in your browser. There is no account and no calculation history.
Privacy details →The short version
EtG detection changes over time
EtG is a direct alcohol metabolite that can remain measurable after breath or blood alcohol is gone. The chance of detection generally decreases with time, but drinking amount and the test cutoff change the shape of that window.
Explore detection-time evidence →0–24hOften detectable
24–48hVaries by dose & cutoff
48–72hSensitivity declines
72h+Upper-end uncertainty
Illustrative only. This is not a personalized test prediction.
Research, not folklore
What the evidence actually supports
Build your understanding
EtG testing, from first question to lab result
Explore tightly focused guides written around the entities that matter: ethyl glucuronide, ethyl sulfate, ethanol, urine creatinine, laboratory cutoffs, and standard drinks.
01
What is an EtG test?Biomarker basics and test purpose
→02EtG detection windowLight, heavy, and repeated exposure
→03Read an EtG urine resultValues, cutoff, EtS, and creatinine
→04EtG false positivesIncidental exposure and confirmation
→05EtG test FAQ36 direct, evidence-informed answers
→06EtG research hubMethods, specimens, and biomarkers
→From the blog
Longer-form analysis from Dr. Frederick
In-depth articles connecting alcohol-biomarker research to how EtG results are actually used and interpreted.
Applied research01
EtG Testing in Monitoring Programs: Accuracy, Fairness, and Real-World Limits
How probation, workplace, and recovery-monitoring programs use EtG testing, why a lab number is not the same thing as a program decision, and what evidence-informed program design looks like.
By Dr. Frederick · 9 minute read →The science behind the test02How Ethyl Glucuronide Reveals Recent Alcohol Use
A plain-language look at the biochemistry behind the EtG test: how a minor ethanol pathway became one of the most specific tools for detecting recent drinking, and what the science still cannot tell you.
By Dr. Frederick · 8 minute read →
Two useful companion tools
Convert the drink. Calculate the timeline.
Turn serving size and ABV into standard drinks, then calculate exact elapsed hours between the end of drinking and a test date.
Common questions
EtG, explained plainly
Clear answers to the questions most calculators leave unresolved.
How long can EtG be detected in urine?+
Detection varies widely. Research shows that dose, time since drinking, testing cutoff, repeated drinking, kidney function, and urine concentration all matter. A higher 500 ng/mL cutoff is generally less sensitive than 100 or 200 ng/mL.
Is the 80-hour EtG test claim accurate?+
It is better understood as a possible upper-end window, especially after heavier drinking—not a guarantee that every exposure remains detectable for 80 hours. Studies show sensitivity falls over time and changes substantially with the cutoff used.
Can an EtG calculator tell me if I will pass?+
No. A calculator cannot know your measured urine concentration or guarantee a test outcome. This tool shows an evidence-informed range and uncertainty rather than a pass/fail promise.
What do 100, 200, and 500 ng/mL mean?+
These are laboratory reporting cutoffs. Lower cutoffs can detect more exposures for longer, but are more sensitive to incidental alcohol exposure. Higher cutoffs reduce some incidental positives but can miss more drinking events.
Does drinking water remove EtG faster?+
Water can dilute a urine sample but does not reliably speed the body's elimination of EtG. Laboratories may check creatinine or sample validity, so dilution is not a dependable strategy.
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