ETG Calculator - Know Your Detection Window
We know waiting for an alcohol test is stressful. Get a quick estimate of your ETG detection window — no signup, no data stored, just answers.
Quick ETG Check
Instant estimation (No data saved)
High Probability of Detection
Estimated 10 more hours until low risk (<100ng/mL).
*This is an estimation only. Individual results vary. Not legal or medical advice.
A Real Example
Let's say you had 4 drinks last night and your test is in 24 hours. You're wondering: will I be okay? Enter your info above, and the calculator will show your estimated risk level — plus how many more hours you might need to wait to reach the low-risk zone.
Remember: this gives you an estimate, not a guarantee. When in doubt, waiting longer is always the safer choice.
Why Choose Our Calculator?
Built for accuracy, transparency, and your privacy.
Runs in Your Browser
All calculations happen locally on your device using JavaScript. Your drinking history never touches our servers — we literally cannot see your data, even if we wanted to. No cookies, no tracking, no logs.
Transparent Formula
We show you exactly how the math works. Our calculations are based on published research about EtG half-life (approximately 2-3 hours) and elimination rates. No black box algorithms here.
Use Instantly
No account creation, no email collection, no "premium" upsells. Just open the page and start calculating. We believe helpful tools should be accessible to everyone, immediately.
What is EtG?
Understanding the test you're facing
EtG (Ethyl Glucuronide) is a direct metabolite of alcohol. Think of it as a "fingerprint" that alcohol leaves behind in your body — even after the alcohol itself is long gone.
Unlike a breathalyzer that only detects alcohol for a few hours, EtG tests can find traces of drinking for 24 to 80 hours. That's why they're commonly used for probation, court-ordered testing, workplace monitoring, and recovery programs.
The tricky part? Everyone metabolizes alcohol differently. Your body weight, liver health, hydration level, and even genetics all play a role in how quickly EtG clears from your system.
How It Works
Three simple steps to get the answers you need.
Enter Your Info
Tell us how many standard drinks you had and how many hours ago. Not sure what counts as a standard drink? One drink equals a 12oz beer, 5oz wine, or 1.5oz shot.
Get Your Result
See your estimated EtG level in ng/mL, your risk category (low, medium, or high), and approximately how long until you reach the low-risk zone.
Make Informed Decisions
Use this information to understand your situation better. If you're in the high-risk zone, consider waiting longer before your test if possible.
Frequently Asked Questions
Common questions about ETG testing and our calculator.
EtG (Ethyl Glucuronide) can typically be detected in urine for 24 to 80 hours after drinking, depending on the amount consumed, your metabolism, hydration levels, and other individual factors. Light drinking (1-2 drinks) may only be detectable for 24-48 hours, while heavy drinking (6+ drinks) can extend detection to 80+ hours or more.
Our calculator provides estimates based on published scientific research on ETG metabolism and half-life data. However, individual results can vary significantly due to factors like body weight, liver function, hydration, and genetic differences. Think of it as a helpful guide, not a guarantee. When stakes are high, err on the side of caution.
Common ETG cutoff levels are 500 ng/mL (standard), 100 ng/mL (low-level), and 50 ng/mL (research). Probation testing often uses the 500 ng/mL cutoff, but some programs use lower thresholds for stricter monitoring. Always check with your supervising officer or testing facility for your specific requirements.
It depends on how much you drank. For light to moderate drinking (1-3 drinks), most people will test negative at the 500 ng/mL cutoff within 48 hours. Heavy drinking may require 72+ hours or more. Our calculator can help estimate your specific situation based on your drinking amount and time elapsed.
Key factors include: amount of alcohol consumed, time since last drink, body weight and composition, liver health and metabolism rate, hydration levels, age, and genetic factors. Women generally metabolize alcohol more slowly than men of similar weight. Chronic heavy drinkers may also have altered metabolism patterns.
Ready for a Detailed Analysis?
Use our full calculator with advanced options like body weight adjustment, hydration factors, and multiple cutoff threshold comparisons.
This calculator provides estimates based on general research. Individual results may vary significantly. This tool is for educational purposes only and should not be used as the sole basis for any decisions. Always consult healthcare professionals for medical advice.