Calculate Pure Alcohol in Grams
Use this tool to estimate how many grams of pure ethanol are in a drink, serving, or full container.
What this grams of alcohol calculator does
This calculator estimates the mass of pure alcohol in your drink. Instead of only seeing ABV percentages, you get a more useful number: total alcohol in grams. That makes it easier to compare different beverages (beer, wine, cider, cocktails, spirits) on a common scale.
For example, a large beer with a low ABV can contain similar alcohol to a small spirit pour with a much higher ABV. Looking at grams helps reveal that quickly.
The formula used
Grams of alcohol = Volume (mL) × (ABV / 100) × 0.789
where 0.789 g/mL is the approximate density of ethanol at room temperature.
- Volume: the size of the drink after conversion into mL.
- ABV: alcohol by volume shown on the label.
- 0.789: density constant used to convert alcohol volume to mass.
Unit conversions used in the calculator
- 1 US fl oz = 29.5735 mL
- 1 L = 1000 mL
- 1 cL = 10 mL
How to use it (quick steps)
- Enter the drink volume.
- Select the volume unit (mL, oz, L, or cL).
- Enter ABV from the label.
- Set number of servings if needed.
- Click Calculate to see grams and standard drink equivalents.
Examples
1) Regular beer
A 355 mL beer at 5% ABV contains about:
355 × 0.05 × 0.789 = 14.0 g of alcohol.
2) Wine glass
A 150 mL wine at 12% ABV contains about:
150 × 0.12 × 0.789 = 14.2 g.
3) Spirit shot
A 44 mL shot at 40% ABV contains about:
44 × 0.40 × 0.789 = 13.9 g.
Notice how these three very different drinks are all near ~14 grams of pure alcohol.
Standard drink comparisons
Definitions vary by country, which can be confusing. This calculator also shows your result in multiple standards:
| Region / Guideline | Approx. grams in 1 standard drink/unit |
|---|---|
| United States | 14 g |
| Australia | 10 g |
| UK Unit | 8 g |
Why grams can be better than “number of drinks”
- Drink sizes vary widely by brand and serving style.
- ABV can differ even within the same drink category.
- Cocktails may include multiple alcohol sources.
- Tracking grams gives a clearer picture of total intake.
Common mistakes to avoid
- Entering ABV as a decimal (0.05) instead of percent (5).
- Mixing up ounces and milliliters.
- Forgetting to multiply by number of servings.
- Assuming “light” drinks always have low alcohol grams.
Important note
This calculator provides an estimate for educational use. It does not estimate blood alcohol concentration (BAC), intoxication level, or fitness to drive. Individual effects vary based on body size, food intake, medications, health, and time. If safety is in question, do not drive or operate machinery.