The ETG Test Calculator is an online tool designed to help individuals estimate their ethyl glucuronide (ETG) levels after alcohol consumption. ETG is a metabolite of ethanol, and its presence in urine, blood, or hair is a key indicator of recent alcohol intake.
Alcohol testing has become a crucial part of workplace compliance, probation monitoring, medical screening, and rehabilitation programs. The ETG test can detect alcohol use up to 80 hours after drinking, making it much more sensitive than traditional breath or blood alcohol tests.
Our calculator allows users to input the amount of alcohol consumed (in grams) and the number of hours since consumption to estimate the likely ETG level (in ng/mL) and determine whether the result would be positive or negative.
ETG Test Calculator
How the ETG Test Calculator Works
The calculator uses a simple yet effective mathematical model to simulate how ETG levels decrease over time as the body metabolizes and excretes alcohol.
Formula Used:
ETG=(Alcohol Consumed (grams)×50)×e−0.1×HoursETG = (Alcohol\ Consumed\ (grams) \times 50) \times e^{-0.1 \times Hours}ETG=(Alcohol Consumed (grams)×50)×e−0.1×Hours
This means:
- The more alcohol you consume, the higher your initial ETG concentration.
- As time passes, the ETG level decreases exponentially due to the body’s natural detoxification process.
Example:
If you consumed 20 grams of alcohol and it has been 12 hours, the ETG level is calculated as: ETG=(20×50)×e−0.1×12=1000×0.301=301ng/mLETG = (20 \times 50) \times e^{-0.1 \times 12} = 1000 \times 0.301 = 301 ng/mLETG=(20×50)×e−0.1×12=1000×0.301=301ng/mL
Since 301 ng/mL is below the 500 ng/mL detection threshold, the calculator will show a “Negative” result.
How to Use the ETG Test Calculator
Follow these easy steps to use the tool effectively:
- Enter the alcohol consumed:
Input the total grams of alcohol you consumed.
(Tip: One standard drink = approximately 14 grams of alcohol.) - Enter hours since consumption:
Type how many hours have passed since your last drink. - Click “Calculate”:
The calculator will instantly display:- Estimated ETG Level (ng/mL)
- Detection Status (Positive or Negative)
- Click “Reset” to clear your inputs and start a new calculation.
Understanding Your Results
| ETG Level (ng/mL) | Detection Status | Meaning |
|---|---|---|
| 0 – 100 ng/mL | Negative | No significant alcohol detected |
| 100 – 500 ng/mL | Borderline | Possible light or past drinking |
| > 500 ng/mL | Positive | Recent or heavy drinking detected |
These values are based on typical laboratory cutoffs used in urine ETG testing. However, note that actual results may vary depending on your metabolism, hydration, and test sensitivity.
Why Use an ETG Test Calculator?
- Awareness Before Testing:
Helps individuals anticipate whether alcohol could still be detectable before a formal test. - Personal Monitoring:
Track recovery progress or ensure sobriety compliance. - Educational Purposes:
Understand how alcohol leaves the body over time. - Confidential and Instant:
No personal data required—get results privately in seconds.
Real-World Example
Let’s say you attended a party and consumed:
- 3 beers (approx. 42 grams alcohol total)
- 24 hours have passed since your last drink.
Using the calculator: ETG=(42×50)×e−0.1×24=2100×0.0907=190ng/mLETG = (42 \times 50) \times e^{-0.1 \times 24} = 2100 \times 0.0907 = 190 ng/mLETG=(42×50)×e−0.1×24=2100×0.0907=190ng/mL
Your ETG Level = 190 ng/mL → Result: Negative
That means your test would likely not detect alcohol anymore after a full day, depending on your metabolism.
Important Notes
- This tool provides an estimate, not a guaranteed test result.
- ETG detection windows vary by testing method and individual factors.
- Hydration, liver function, and alcohol type can influence ETG decay rates.
- Always consult professionals for medical or legal testing.
Advantages of Using This Online Tool
- ✅ Instant calculation — no waiting for lab results.
- ✅ Simple input and clear output.
- ✅ Works on mobile and desktop.
- ✅ Free and anonymous.
- ✅ Scientifically modeled using exponential decay formula.
Tips for Accurate Results
- Measure your alcohol consumption accurately.
- Allow for body weight, age, and gender variations.
- Avoid testing immediately after drinking.
- Remember ETG remains detectable for up to 80 hours in some cases.
20 Frequently Asked Questions (FAQs) About ETG Test Calculator
1. What does ETG stand for?
ETG stands for Ethyl Glucuronide, a metabolite produced when the body breaks down ethanol.
2. What does the ETG Test Calculator measure?
It estimates the ETG concentration (ng/mL) in your body based on alcohol intake and elapsed time.
3. How accurate is the ETG Test Calculator?
It provides an approximate estimate based on mathematical decay, not an official lab result.
4. Can ETG tests detect alcohol after 2 days?
Yes. ETG may be detectable for up to 80 hours (3.3 days) after drinking.
5. What ETG level is considered positive?
Levels above 500 ng/mL are generally considered positive.
6. Can small amounts of alcohol show up on an ETG test?
Yes. Even small consumption can produce detectable ETG levels for several hours.
7. Will using mouthwash affect ETG levels?
Yes, alcohol-based mouthwashes can sometimes trigger low-level ETG positives.
8. How do I convert drinks to grams of alcohol?
Multiply number of drinks × 14 grams (approx. one standard drink).
9. Is ETG testing used for probation monitoring?
Yes, it’s a standard method for probation, rehab, and workplace sobriety programs.
10. How long does ETG stay in the urine?
Typically 24–80 hours, depending on metabolism and hydration.
11. What is the cutoff for a negative ETG test?
Usually below 500 ng/mL is considered negative.
12. Does drinking water help reduce ETG levels faster?
Hydration may help dilute urine but doesn’t eliminate ETG faster.
13. Can the calculator replace a real ETG test?
No. It’s a prediction tool, not a certified medical test.
14. What are ng/mL units?
It stands for nanograms per milliliter, a standard measurement for lab tests.
15. Does body weight affect ETG results?
Yes, heavier individuals may metabolize alcohol differently.
16. Can ETG detect non-beverage alcohol sources?
Yes—like hand sanitizers, medications, or certain foods.
17. What happens if my ETG test is positive?
It indicates recent alcohol use. Contact your medical or legal supervisor for guidance.
18. Are ETG tests used in healthcare?
Yes, often for liver patients, addiction recovery, and pre-surgery screening.
19. Is the ETG Test Calculator free to use?
Absolutely — it’s 100% free and online.
20. Can I use this calculator anonymously?
Yes. It doesn’t store or track any user data.
Conclusion
The ETG Test Calculator is an invaluable tool for anyone who wants to monitor alcohol detection levels safely and privately. Whether you’re preparing for a workplace test, following a sobriety program, or just curious about your body’s metabolism, this calculator gives you quick insights into your ETG levels and detection status.
Use it responsibly and remember — while this calculator is scientifically modeled, it should not replace professional lab testing for official or medical purposes.