Calculate ABV from original and final gravity, find standard drinks per serving, estimate alcohol calories, and get an approximate BAC for any beer, wine, cider, or spirit.
Enter your Original Gravity (OG) before fermentation and Final Gravity (FG) after fermentation is complete. Uses the standard homebrewing ABV formula.
Specific gravity before fermentation (e.g. 1.050)Enter OG between 1.000 and 1.200.
Specific gravity after fermentation (e.g. 1.010)Enter FG between 0.990 and 1.100.
Use accurate formula for high-gravity beers above 8% ABV
Alcohol By Volume
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⚠️ Disclaimer: ABV calculations are estimates based on gravity readings. Actual ABV may vary by 0.1–0.5% depending on fermentation completeness, hydrometer calibration, and temperature. For regulatory or commercial labeling, use certified laboratory analysis.
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Enter the ABV percentage and serving volume to calculate standard drinks, pure alcohol grams, and how many servings are in a full bottle or container.
Enter ABV between 0 and 100.
Enter a valid serving volume.
Standard Drinks
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⚠️ Disclaimer: Standard drink calculations are for informational purposes only. Alcohol affects individuals differently based on body weight, metabolism, food intake, and tolerance. Never drive after consuming alcohol. Always drink responsibly.
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Calculate calories from alcohol in any beverage. Pure ethanol provides 7 calories per gram. Total beverage calories also include carbohydrates — estimated here by beverage type.
Enter ABV between 0 and 100.
Enter a valid volume.
Total calories for multiple servings
Total Calories
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⚠️ Disclaimer: Calorie estimates include alcohol calories (7 kcal/g) plus approximate carbohydrate calories by beverage type. Actual calories vary by brand and recipe. For exact calorie counts, check the manufacturer's nutrition label.
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Sources & Methodology
ABV calculations use the ASBC (American Society of Brewing Chemists) standard formulas derived from the relationship between specific gravity and ethanol content. Calorie calculations use the USDA value of 7 kcal per gram of pure ethanol.
// ABV formulas Simple ABV = (OG - FG) x 131.25 Accurate ABV = (76.08 x (OG-FG) / (1.775-OG)) x (FG/0.794) Pure alcohol = Volume(ml) x ABV% x 0.789 [grams] Std drinks(US)= Pure alcohol(g) / 14 Alcohol calories= Pure alcohol(g) x 7 [kcal]
Complete Guide to Alcohol By Volume (ABV)
Alcohol by volume (ABV) is one of the most fundamental measurements in brewing, winemaking, distilling, and beverage labeling. Whether you are a homebrewer checking if fermentation is complete, a consumer tracking standard drinks, or someone curious about the calorie content of your glass of wine, understanding how ABV is calculated gives you precise control over what you are drinking and making.
How ABV Is Calculated from Original and Final Gravity
In homebrewing, ABV is determined by measuring the specific gravity of the wort or must before and after fermentation. Specific gravity measures the density of the liquid relative to water (water = 1.000). Wort before fermentation is denser than water because of dissolved sugars — a typical ale wort might have an OG of 1.050, meaning it is 5% denser than water. After yeast converts those sugars into alcohol and CO2, the liquid becomes less dense, giving a final gravity closer to 1.010.
The standard formula, validated by the American Society of Brewing Chemists, is: ABV = (OG - FG) × 131.25. For OG 1.060 and FG 1.010: (0.060) × 131.25 = 7.88% ABV. This formula is accurate to within 0.1–0.3% for standard-strength beers below 8% ABV. For high-gravity beers, imperial stouts, or strong ales above 8% ABV, use the more accurate formula: ABV = (76.08 × (OG − FG) / (1.775 − OG)) × (FG / 0.794).
ABV Reference Table for Common Beverages
Beverage
Typical ABV Range
Standard ABV
US Std Drinks per 12oz
Light beer
3.5–4.2%
4.0%
0.8
Regular lager / ale
4–6%
5.0%
1.0
IPA / craft ale
5.5–7.5%
6.5%
1.3
Imperial IPA / DIPA
8–12%
9.0%
1.8
Barleywine / imperial stout
9–15%
11.0%
2.2
Hard cider
4–8%
5.5%
1.1
Dry white / red wine (5oz)
11–14%
13.0%
1.15
Sweet / dessert wine (3oz)
15–22%
17.0%
0.9
Sparkling wine / Champagne
11–13%
12.0%
1.06
Spirits / liquor (1.5oz shot)
35–50%
40.0%
1.0
Port / sherry (2oz)
15–22%
18.0%
0.76
Mead
8–20%
12.0%
2.4 per 12oz
Standard Drinks: Why the Definition Varies by Country
A "standard drink" is a public health concept used to help people track alcohol consumption — but the amount of pure alcohol it represents differs significantly by country. In the United States, one standard drink = 14 grams of pure ethanol. This equals a 12 oz regular beer at 5%, a 5 oz glass of wine at 12%, or a 1.5 oz shot of spirits at 40%. In the UK, one unit = 8 grams (the smallest standard in the world). Australia uses 10 grams, Canada uses 13.6 grams.
Understanding standard drinks helps track consumption relative to health guidelines. The US Dietary Guidelines recommend no more than 1 standard drink per day for women and 2 for men. The UK recommends no more than 14 units per week (equivalent to about 6 pints of regular beer or 10 small glasses of wine).
Calories in Alcohol: What ABV Tells You
Alcohol is calorie-dense at 7 kilocalories per gram of pure ethanol — nearly double the calories of carbohydrates (4 kcal/g) and protein (4 kcal/g), though less than fat (9 kcal/g). The calculation is straightforward: multiply the volume in ml by the ABV percentage by 0.789 (ethanol density in g/ml) to get grams of pure alcohol, then multiply by 7 for calories.
A standard 355ml (12 oz) beer at 5% ABV contains: 355 × 0.05 × 0.789 × 7 = approximately 98 calories from alcohol alone. However, most beers also contain carbohydrates (residual sugars, maltodextrins) which add 20–50 additional calories per serving. Light beers reduce both alcohol and carbohydrate content to reach 90–110 total calories, while regular beers range 140–180 calories, and craft IPAs can reach 200–250 calories per serving.
Homebrewing: Reading a Hydrometer and Refractometer
A hydrometer measures specific gravity by buoyancy — the denser the liquid, the higher the hydrometer floats. To use it: draw a sample into a test tube, float the hydrometer, and read the gravity at the bottom of the meniscus at eye level. Calibration temperature is usually 60°F (15.5°C) or 68°F (20°C) — correct readings taken at other temperatures using the standard formula (+0.001 SG per 7.4°F above calibration).
A refractometer measures how much light bends through the liquid. It is faster and requires only a drop of liquid, making it ideal for taking OG readings. However, refractometers give inaccurate FG readings in the presence of alcohol because ethanol has a different refractive index than sugar-water. Always use a corrected refractometer formula or switch to a hydrometer for final gravity readings after fermentation.
Attenuation: How Much Sugar Did Your Yeast Convert?
Attenuation measures how much of the fermentable sugars were consumed by yeast. Apparent attenuation (%) = ((OG − FG) / (OG − 1.000)) × 100. A beer with OG 1.060 and FG 1.010 has apparent attenuation of (0.050 / 0.060) × 100 = 83.3%. Most ale yeasts attenuate 73–80%, leaving some residual body and sweetness. High-attenuation yeasts (like some Belgian strains) can reach 85–90%, producing very dry, crisp beer. Lager yeasts are typically highly attenuative at 77–82%.
Frequently Asked Questions
ABV (Alcohol By Volume) is the percentage of pure ethanol in a liquid by volume. A 5% ABV beer means 5ml of pure alcohol per 100ml of beverage. It is measured commercially by distillation and density comparison, or estimated in homebrewing using a hydrometer to measure specific gravity before (OG) and after (FG) fermentation. ABV is the universal global standard — proof is used in the US and equals ABV x 2 (80 proof = 40% ABV).
Use the formula: ABV = (OG - FG) x 131.25. For example: OG 1.055, FG 1.012 → (0.043) x 131.25 = 5.64% ABV. For high-gravity beers above 8% ABV, use the more accurate formula: ABV = (76.08 x (OG-FG) / (1.775-OG)) x (FG/0.794). The simple formula is accurate within 0.2% for most standard beers and is used by the majority of homebrewers.
In the United States, one standard drink contains exactly 14 grams (0.6 fl oz) of pure alcohol. This is equivalent to: 12 oz regular beer at 5% ABV, 8-9 oz malt liquor at 7% ABV, 5 oz wine at 12% ABV, or 1.5 oz (a shot) of 80-proof spirits at 40% ABV. The standard drink concept helps people track consumption against health guidelines — the Dietary Guidelines for Americans recommend up to 1 drink per day for women and 2 for men.
A 355ml (12 oz) regular beer at 5% ABV contains about 140-170 total calories (98 from alcohol + 40-72 from carbs). A 148ml (5 oz) glass of dry wine at 13% ABV contains about 120-130 calories. A 44ml (1.5 oz) shot of 40% spirits contains about 97 calories from alcohol alone (no carbs if unmixed). Alcohol provides 7 calories per gram. Light beers reduce both alcohol and carbs to reach 90-110 total calories.
Target OG and FG depend on beer style: Light lager: OG 1.028-1.040, FG 1.004-1.010 (3.1-4.7% ABV). American pale ale: OG 1.045-1.060, FG 1.008-1.014 (4.4-6.2% ABV). IPA: OG 1.056-1.075, FG 1.008-1.018 (5.5-7.5% ABV). Stout: OG 1.044-1.060, FG 1.011-1.019 (4.0-5.1% ABV). Imperial stout: OG 1.075-1.115, FG 1.018-1.030 (8-10% ABV). The BJCP Style Guidelines provide target ranges for every recognized beer style.
Fermentation is complete when gravity stops changing over 48-72 hours. Take a gravity reading, wait 2 days, take another — if identical, fermentation is done. Do not rely on airlock bubbling alone — CO2 can escape through seals without visible bubbling. The FG should be within the expected range for your yeast strain and recipe. Most ale strains finish in 5-10 days at 18-22°C. Lager strains can take 2-4 weeks at 7-12°C.
In the United States, proof = ABV x 2. An 80-proof spirit is 40% ABV. A 100-proof spirit is 50% ABV. The UK uses a different historical proof system: UK proof = ABV x 1.75. So UK 70 proof = 40% ABV. Since 1980, most countries have switched to ABV percentage as the primary label standard. US spirits are required to display both proof and ABV percentage on the label per TTB regulations.
Refractometers are not accurate for final gravity without correction because alcohol refracts light differently than sugar. Use the Sean Terrill correction formula or a brewing app to correct refractometer FG readings. Alternatively, simply use a hydrometer for FG — it is not affected by alcohol presence. For OG measurements before pitching yeast, refractometers are fast and accurate and only need a 1-2 drop sample.
High-gravity brewing refers to brewing with an OG above 1.060-1.070, producing beer above 6-8% ABV. High-gravity worts require more fermentable sugars (more malt), strong yeast strains with high alcohol tolerance, proper yeast nutrition (zinc, nitrogen), and careful temperature management since fermentation generates more heat. Yeast health is critical — underpitching or stressing yeast in high-gravity environments leads to stuck fermentation, off-flavors, and lower-than-expected attenuation.
A simple approximation for wine: ABV = Brix x 0.55. A grape must at 24 Brix will produce approximately 24 x 0.55 = 13.2% ABV wine. A more precise formula: ABV = (0.0017 x Brix squared) + (0.5624 x Brix) - 0.0781. Most commercial wines start fermentation at 22-26 Brix. Grapes in warm climates (California, Australia, Argentina) often reach 25-28 Brix, producing naturally higher-alcohol wines of 14-16% ABV.
Hydrometers are calibrated to either 60°F (15.5°C) or 68°F (20°C). Taking a reading at a higher temperature makes liquid less dense, producing a reading lower than actual. Correction: add 0.001 SG per 7.4°F (4.1°C) above calibration temp. At 86°F (30°C): add 0.003 to your reading. At 100°F (38°C): add 0.006. Always cool wort samples to within 20°F of calibration temperature before measuring for most accurate results, or use a digital thermometer with a correction table.
A standard 750ml bottle of wine at 13% ABV contains: 750 x 0.13 x 0.789 / 14 = approximately 5.5 US standard drinks. At 12% ABV: about 5.1 standard drinks. At 14% ABV: about 5.9 standard drinks. A standard 5 oz (148ml) pour at 13% ABV equals about 1.15 US standard drinks — slightly more than one standard drink. Restaurants typically pour 5-6 oz per glass, meaning a 750ml bottle yields 4-5 glasses but 5-6 standard drinks.
Apparent attenuation measures how much fermentable sugar the yeast consumed: Attenuation (%) = ((OG - FG) / (OG - 1.000)) x 100. For OG 1.060 and FG 1.012: ((0.048) / (0.060)) x 100 = 80% apparent attenuation. Most ale yeasts reach 73-83% attenuation. Low attenuation (below 65%) indicates a stuck fermentation or low-attenuating yeast. High attenuation above 85% indicates a highly fermentable wort or a highly attenuating yeast strain.
In the United States, any beverage with 0.5% ABV or more is classified as an alcoholic beverage and regulated by the TTB. Beverages below 0.5% ABV are classified as non-alcoholic. In the EU, beverages must be above 1.2% ABV to be labeled alcoholic. Kombucha typically falls at 0.5-3% ABV depending on fermentation, placing commercial kombucha in a gray regulatory zone that has led to TTB scrutiny of kombucha producers since 2016.
The simple ABV formula (OG-FG) x 131.25 is accurate to within 0.1-0.3% ABV for beers below 8% ABV when gravity readings are accurate. Sources of error include: hydrometer temperature correction (+/- 0.002 SG), meniscus reading technique (+/- 0.001 SG), and residual non-fermentable sugars. Each 0.001 SG error translates to roughly 0.13% ABV error. For commercial or regulatory purposes, ABV must be determined by certified laboratory distillation method, not gravity calculation.