The Quick Answer
Worried about your ETG test? The first step is knowing exactly how much alcohol a drink contains. Most people guess wrong, and undercounting can make any ETG estimate misleading.
One standard drink in the US contains 14 grams (0.6 oz) of pure alcohol. This is the amount in 12 oz of regular beer, 5 oz of wine, or 1.5 oz of spirits. This definition comes from the National Institute on Alcohol Abuse and Alcoholism (NIAAA).
- 1 standard drink = 14 grams pure alcohol (US definition)
- Beer (12 oz), Wine (5 oz), Spirits (1.5 oz) all equal 1 drink
- Craft beers and large pours often count as 1.5-2+ drinks
Ready to calculate? Use our ETG calculator below:
Quick ETG Check
Instant estimation (No data saved)
Above 500 ng/mL in the model
The model estimate sits above the common 500 ng/mL cutoff. It is educational context, not a test-result prediction.
*Educational estimate only. Individual results vary. Not medical, legal, or testing-decision advice.
Visual Reference
Here's what one standard drink looks like for each type:
Regular Beer
Cans or bottles
Table Wine
Standard pour
Distilled Spirits
Shot or mixed
Important: These are standard sizes. Real-world drinks often exceed these amounts.
Why Accurate Counting Matters for ETG
ETG (Ethyl Glucuronide) tests are extremely sensitive. They can detect alcohol consumption for 24-80 hours after drinking—far longer than breath or blood tests. This sensitivity means small counting errors have big consequences.
Here's the problem: If you think you had 3 drinks but actually had 5, your ETG calculator estimate will be off by hours. The model may understate the likely detection window.
Consider this real scenario: You had "a few beers" watching the game. But those were 16 oz pints of 7% IPA from a craft brewery. Three pints = 5.7 standard drinks, not 3. That's nearly double what you thought—and could mean 10+ extra hours of detection time.
ETG results can have serious consequences in some settings, including:
- Probation violations
- Loss of professional licenses
- Custody complications
- Treatment program consequences
Bottom line: Take 2 minutes to count accurately. It's worth it.
Common Mistakes
Most people undercount their drinks. Here's why:
Craft Beer Trap
A regular 12 oz beer at 5% ABV = 1 standard drink. But craft beers are different:
| Beer Type | Typical ABV | 12 oz Equals |
|---|---|---|
| Light beer | 4% | 0.8 drinks |
| Regular beer | 5% | 1.0 drink |
| IPA | 6-7% | 1.2-1.4 drinks |
| Imperial IPA | 8-10% | 1.6-2.0 drinks |
| Strong ale | 9-12% | 1.8-2.4 drinks |
A pint (16 oz) of 7% IPA = 1.9 standard drinks. Count it as 2.
Real example: Mike had 4 craft beers at a brewery tour. He thought that was "4 drinks." But they were 10 oz pours of 8.5% stout. Actual count: 4.8 standard drinks. His ETG estimate was off by nearly 6 hours.
Wine Pour Reality
The standard pour is 5 oz. But wine glasses vary dramatically:
- Restaurant pour: Often 6-8 oz (1.2-1.6 drinks)
- Home pour: Usually "generous" 7-10 oz (1.4-2.0 drinks)
- Wine glass size: Many hold 12-20 oz when full
Tip: Fill your glass, then measure it once. You'll be surprised.
Real example: Sarah thought she had "2 glasses of wine" at dinner. Her home pours were 8 oz each in large wine glasses. Actual count: 3.2 standard drinks—not 2.
Mixed Drink Math
A "standard" cocktail has 1.5 oz of spirits = 1 drink. But:
- Strong cocktails (Long Island, Margarita): 2-4 drinks
- Double shots: 2 drinks
- Home pours: Often 2-3 oz (1.3-2 drinks)
Real example: Two Long Island Iced Teas at a bar? That's potentially 8-10 standard drinks, not 2. One drink order doesn't equal one standard drink.
The Formula
If you want to calculate precisely:
Standard Drinks = (Volume in oz × ABV%) ÷ 60
Example: A 16 oz pint of 6.5% IPA:
- (16 × 6.5) ÷ 60 = 104 ÷ 60 = 1.7 standard drinks
Or use our ETG Calculator and we'll do the math.
Regional Differences
"Standard drink" means different things in different countries:
| Country | Pure Alcohol | Equivalent Beer (5%) |
|---|---|---|
| United States | 14g (0.6 oz) | 12 oz (355 mL) |
| United Kingdom | 8g (0.3 oz) | 6.8 oz (200 mL) |
| Australia | 10g (0.4 oz) | 8.5 oz (250 mL) |
| Canada | 13.6g | 11.5 oz (341 mL) |
Our calculator uses US standards (14g). If you're in another country, your official "drinks" may be smaller than ours.
Practical Tips
Before You Drink
- Know your glass size - Measure it once
- Check ABV - Look at the label or tap sign
- Round up - When unsure, assume more
Counting Accurately
- 1 can/bottle of regular beer = 1 drink
- 1 pint of craft beer = 1.5-2 drinks
- 1 restaurant wine glass = 1.5 drinks
- 1 "home pour" wine = 2 drinks
- 1 cocktail (varies) = 1-3 drinks
For ETG Tests
The ETG Calculator gives you time estimates based on standard drinks. Input accuracy matters. Undercount your drinks, and you'll underestimate your detection time.
When in doubt, count conservatively and remember that the calculator is still an estimate, not a lab result.
Related Resources
- ETG Calculator — Run your calculation
- ETG Detection Time Chart — Visual breakdown
- Calculation Formula — The science behind it
- ETG Detection Times — In-depth guide
Adjust your count proportionally. A 7% beer is 1.4 standard drinks. An 8% beer is 1.6. Our ETG calculator accepts decimal inputs, so enter 1.5 or 2 if you had stronger beers.
No. ETG measures alcohol metabolites, not the type of drink. 14 grams of alcohol produces similar ETG whether it came from beer, wine, or vodka. Only the total alcohol amount matters.
Count the number of standard shots (1.5 oz of 40% spirits each). A typical cocktail has 1-2 shots. A Long Island Iced Tea can have 4-5 shots. Ask the bartender if unsure.
Yes, when using the ETG calculator. Overestimating is less misleading than underestimating. If you had 'about 3 drinks,' entering 4 gives a more conservative estimate, but it still should not be treated as a guaranteed lab result.
This page is for educational purposes only. It does not constitute medical or legal advice. For specific guidance, consult a healthcare provider or legal professional.