EtG Calculator
Estimate your current EtG (ethyl glucuronide) level after drinking alcohol. Free online EtG test calculator with clearance time predictions and detailed decay chart.
About This Calculator
The EtG Calculator (Ethyl Glucuronide) estimates your current EtG level — a direct metabolite of alcohol used as a biomarker in urine drug tests. When your liver processes ethanol, a small fraction binds with glucuronic acid to form ethyl glucuronide. Unlike a breathalyzer that measures current intoxication, EtG tests detect recent alcohol consumption over a longer window. This calculator helps you understand your estimated EtG level based on scientifically established pharmacokinetic principles.
How the calculation works: The calculator uses a first-order elimination model calibrated to published pharmacokinetic data for EtG. The peak EtG concentration is calculated proportionally to alcohol dose (standard drinks × 14 g ethanol per drink) divided by body weight, with a gender-specific adjustment factor. After peak (~1 hour post-consumption), EtG declines exponentially with a half-life of approximately 5.4 hours. The model predicts your current EtG level and projects the time required to fall below the standard 500 ng/mL urine test threshold and to reach complete elimination.
Regional Notes
United States: The calculator uses the US standard drink definition of 14 g ethanol (NIAAA). The 500 ng/mL threshold is the most common cutoff used by SAMHSA-certified laboratories, though some programs use 100 ng/mL or 250 ng/mL for stricter monitoring. EtG testing is commonly used in drug courts, professional monitoring programs, and alcohol treatment centers.
United Kingdom: The UK defines a unit of alcohol as 8 g (approximately 0.6 US standard drinks). When using this calculator, convert UK units to US standard drinks by multiplying by 0.57. EtG testing in the UK is less common but used in some family court proceedings and occupational health settings; the Society of Hair Testing notes limitations of EtG for determining abstinence.
India: India does not have a standard drink definition equivalent to the US or UK. A typical Indian pegger (30 mL of spirits) contains approximately 10 g of pure alcohol. Alcohol testing in India primarily uses breathalyzers and blood alcohol tests rather than EtG urine tests, though EtG testing is available through major diagnostic labs in metropolitan areas.
Disclaimer: This calculator provides estimates only and should not be used as a substitute for professional laboratory EtG testing. Individual metabolism varies significantly based on genetics, liver function, hydration, medications, and other factors. Results should not be used for legal, employment, or disciplinary purposes.
Frequently Asked Questions
What is EtG on a drug test?
EtG (ethyl glucuronide) is a direct metabolite of ethanol formed when your liver breaks down alcohol. EtG urine tests detect this biomarker to estimate recent alcohol consumption, typically within the past 24 to 80 hours depending on the amount consumed. Unlike a breathalyzer, EtG tests do not measure current impairment — they detect any recent alcohol use.
How does the EtG calculator work?
The EtG calculator estimates your current ethyl glucuronide level using a pharmacokinetic model based on your gender, number of standard drinks consumed, body weight, and time elapsed since your last drink. It also predicts how long it will take for your EtG level to drop below the standard 500 ng/mL urine test threshold and to reach zero using first-order elimination kinetics with a half-life of approximately 5.4 hours.
What are realistic EtG detection times?
EtG detection times depend on the amount of alcohol consumed and individual factors. Light drinking (1–2 drinks) usually clears within 24 to 36 hours. Moderate drinking (3–6 drinks) can take 48 to 72 hours. Heavy drinking (7+ drinks) may take up to 5 days (80–120 hours) for the metabolite to completely flush out. These estimates vary by body weight, gender, metabolism, and hydration levels.
Is an EtG test accurate?
EtG tests are highly sensitive and can detect even very small amounts of alcohol. However, they can produce false positives from incidental exposure to alcohol-containing products like mouthwash, hand sanitizer, certain foods, or over-the-counter medications. The U.S. Substance Abuse and Mental Health Services Administration (SAMHSA) has cautioned that EtG testing alone is scientifically unsupportable as the sole basis for legal or disciplinary action.
What is a standard drink?
In the United States, a standard drink contains about 14 grams of pure alcohol according to the NIAAA. This equals approximately 12 ounces of 5% beer, 5 ounces of 12% wine, or 1.5 ounces of 40% distilled spirits (a shot). In the UK, a standard drink (unit) contains 8 grams of alcohol, and in many other countries it varies from 8 to 14 grams. This calculator uses the US standard of 14 grams per drink.
What EtG level is considered positive on a urine test?
Most laboratories use a cutoff of 500 ng/mL for a positive EtG urine test, though some programs may use a lower threshold of 100 ng/mL for greater sensitivity. A level above 500 ng/mL is generally considered evidence of recent alcohol consumption. Levels between 100 and 500 ng/mL may be considered indeterminate or consistent with incidental exposure.
Can I speed up EtG elimination from my body?
EtG elimination follows first-order kinetics and is primarily processed by the kidneys and excreted in urine. Staying well-hydrated can help maintain normal kidney function but will not significantly accelerate EtG elimination. Time is the only reliable factor — the body metabolizes and eliminates EtG at a relatively fixed rate regardless of exercise, sweating, or drinking large amounts of water. The elimination half-life is approximately 5.4 hours.
Why do women have higher EtG levels than men for the same number of drinks?
Women typically have a higher percentage of body fat and lower total body water volume compared to men of the same weight. Since EtG distributes throughout body water, the same amount of alcohol produces a higher concentration of EtG in women. On average, women produce approximately 24% more EtG per standard drink than men, which is reflected in the calculator's gender-specific formula.