Free EtG Calculator: Will You Pass?
Calculate your EtG (Ethyl Glucuronide) levels and clearance time instantly using our free EtG tool. Based on the Widmark formula, 100% private, all calculations happen in your browser.
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How We Calculate EtG: The Science
Our EtG formula uses the Widmark equation combined with EtG decay research to estimate your levels. It is a realistic EtG calculator, not a lab result or guarantee.
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Your data never leaves this browser. No cookies, no tracking, no servers. Complete anonymity guaranteed.
Visual Decay Curve
See exactly when your levels drop below the 500ng/mL and 100ng/mL cutoffs with our interactive chart.
Real-Time Estimate
Input your drinking history and get an instant 'Pass' or 'Fail' probability based on current time.
Realistic EtG estimates
Why this calculator is realistic, not a guarantee
People often search for the most accurate EtG calculator, but no free online EtG calculator can predict a lab result with certainty. This tool gives an advanced EtG estimate by combining alcohol exposure math, EtG half-life assumptions, common urine cutoffs, and a clear margin of uncertainty.
Widmark-based alcohol estimate
The model starts with weight, biological sex, drinks, ABV, and time to estimate alcohol exposure before projecting EtG decline.
See the calculation methodEtG half-life decay model
EtG does not disappear instantly. The estimate uses an exponential decay curve, then compares the projected level with testing cutoffs.
Open half-life calculator100 vs 500 ng/mL cutoff context
A stricter 100 ng/mL cutoff can remain positive longer than a 500 ng/mL cutoff. Your program or lab policy matters.
View EtG levels chartIndividual variation still matters
Hydration, liver function, drinking pattern, specimen validity checks, and confirmation testing can change real-world interpretation.
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Read PageLearn More About EtG Testing
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How to Calculate EtG
Learn the Widmark formula and understand how EtG levels are calculated step-by-step.
Read GuideBest Practices
Tips for understanding your test, detection windows, and what actually helps.
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Understand the key differences between EtG and Blood Alcohol Concentration tests.
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Deep dive into the EtG molecular structure, glucuronidation process, and calculation formulas.
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Frequently Asked Questions
Common questions about how to calculate EtG, detection windows, and what affects your results.
How accurate is this EtG calculator?
This EtG calculator provides an estimate based on the Widmark formula and average metabolic rates. Individual factors like genetics, liver health, and hydration can significantly affect actual results. Our algorithm is based on peer-reviewed research but should not replace professional medical advice.
Will 3 beers show up on a urine test after 24 hours?
For most people, 3 beers (about 3 standard drinks) will likely still be detectable via EtG after 24 hours, especially at the strict 100 ng/mL cutoff. At the standard 500 ng/mL cutoff, you may test negative. Use our calculator with your specific weight and gender for a personalized estimate.
What is the 80-hour rule for alcohol?
The '80-hour rule' refers to the maximum detection window for EtG in urine. However, this extreme timeframe only applies to very heavy binge drinking (8+ drinks). For moderate drinking (3-5 drinks), the typical detection window is 24-48 hours. Don't panic about 80 hours—it's rare and not typical.
How to pass an EtG test in 24 hours?
If you drank heavily, passing an EtG test in 24 hours is very difficult. Time is the only proven factor for eliminating EtG. Staying hydrated may help slightly but won't speed up metabolism. There's no scientifically proven 'detox' method. The best approach is to allow sufficient time before your test.
Can I speed up the detox process?
No proven method speeds up EtG elimination. Your liver processes alcohol at a fixed rate (about 0.015% BAC per hour). Drinking water helps hydration but doesn't accelerate metabolism. 'Detox drinks' have no scientific evidence supporting their effectiveness. Time is the only reliable factor.
What factors affect EtG levels?
Several factors influence EtG levels: body weight (heavier people have more body water to dilute alcohol), biological sex (males typically have a Widmark factor of 0.68 vs 0.55 for females), liver health, hydration status, amount and type of alcohol consumed, and individual genetic variations.