Free ETG Calculator (Realistic) — Online EtG Urine Test Estimator

Use this free ETG calculator online to estimate a conservative EtG/EtS alcohol detection window in urine based on the number of standard drinks and when you stopped drinking. This is an educational tool — not medical or legal advice.

Enter Your Information

Your Results

Risk Level:

ℹ️ Based on your input, detection is unlikely

⏰

Detection Window:

Up to 24 hours

Remember: This is an estimate based on average elimination rates and detection thresholds. Individual results may vary based on many factors including metabolism, hydration, and test sensitivity.

How to use this ETG calculator app

Enter the number of standard drinks you had.
Set the time since last drink (hours since you stopped drinking).
Add your weight and gender for more accurate estimates.
Click Calculate to get a detection window estimate and see your current risk level.

This tool aims to be a quick ETG calculator for educational planning. If you need the most accurate ETG calculator, only a certified laboratory test under professional guidance can provide a definitive result.

How this ETG calculator estimates your window

The estimator uses published ranges and practical heuristics for urine EtG/EtS detection. It groups consumption into buckets and applies small adjustments for weight/sex and lab cutoff.

Heuristic "formula"

Let D = number of standard drinks (1 drink ≈ 14 g ethanol, US).
Base window W (hours after finish time):

  if 1 ≤ D ≤ 2 → W ≈ 12–24 h    (light)
  if 3 ≤ D ≤ 5 → W ≈ 24–48 h    (moderate)
  if 6 ≤ D ≤ 8 → W ≈ 36–72 h    (heavy)
  if D ≥ 9     → W ≈ 48–96 h    (binge)

Optional conservative nudges:
  weight < 60 kg → +6 h to upper bound
  sex = female    → +6 h to upper bound

Cutoff effect (see table below): lower cutoffs (e.g., 100 ng/mL) can extend detection vs 500 ng/mL.

Quick reference table: drinks → typical detection window

Drinks (standard)	Pattern	Typical EtG window	Notes
1–2	Light	~12–24 h	Hydration & cutoff can shift the upper bound.
3–5	Moderate	~24–48 h	Spacing drinks out may shorten the upper bound.
6–8	Heavy	~36–72 h	Conservative range for varied physiology.
9+	Binge	~48–96 h	Some cases exceed 96 h at low cutoffs.

Lab cutoff & other factors

Factor	Typical effect	Why it matters
Cutoff 100 ng/mL	Longest detection	More sensitive threshold detects lower EtG levels.
Cutoff 200–300 ng/mL	Medium	Balances sensitivity & specificity.
Cutoff 500 ng/mL	Shorter detection	Higher threshold may miss late/low concentrations.
Body weight < 60 kg	+ up to ~6 h (upper bound)	Conservative nudge for volume of distribution.
Female sex	+ up to ~6 h (upper bound)	Conservative nudge for average metabolism/volume.
Hydration/dilution	Can shorten detection	Urine dilution lowers measured EtG concentration.
Binge pattern	Can extend detection	Higher cumulative EtG load.

Visual Detection Window Chart

Detection window ranges by number of drinks consumed

EtG Elimination Timeline

Typical EtG concentration decline over time (illustrative)

Frequently Asked Questions

Is this the "best ETG calculator"?

"Best" depends on your goal. This site focuses on a realistic ETG calculator philosophy: conservative ranges, transparent assumptions, and no data collection.

Is it a free ETG calculator?

Yes — it's a free ETG calculator online. No sign-in, no paywall.

What's the difference between BAC and EtG?

BAC reflects current alcohol in blood and drops to 0 relatively quickly. EtG/EtS are metabolites that can remain detectable in urine for longer even after BAC returns to 0. This is why an etg urine test calculator is different from a BAC estimator.

Will low cutoffs always detect longer?

Often yes, but physiology and sampling matter. The etg alcohol test calculator logic shows lower cutoffs (e.g., 100 ng/mL) generally extend detection time compared with 500 ng/mL.

Does this replace a lab test?

No. It doesn't diagnose, treat, or clear anyone for compliance. See the disclaimer below.

What counts as a standard drink?

In the US: 14g ethanol. Examples: 12oz (355ml) beer at ~5%, 5oz (148ml) wine at ~12%, 1.5oz (44ml) spirits at ~40%.

How accurate is this ETG calculator?

This calculator provides educational estimates based on published research and conservative ranges. Individual results vary significantly due to metabolism, hydration, test sensitivity, and other factors. Only a certified laboratory test can provide definitive results.

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Important disclaimer

This ETG calculator (including all variants such as etg test calculator, etg calculator urine test, and etg calc) is for informational and educational purposes only. It provides a preliminary, heuristic estimate and is not medical, legal, or employment advice. Do not rely on it for decisions related to safety, work, compliance, treatment, or court orders. Only a certified laboratory test interpreted by qualified professionals can determine actual results.