ABV Calculator - Alcohol by Volume & Standard Drinks Calculator
Calculate alcohol by volume, standard drinks, BAC estimate, dilution ratio, and cocktail mixing ABV with our comprehensive alcohol calculator.
About This ABV Calculator
This comprehensive ABV (Alcohol by Volume) Calculator provides five calculation modes to meet diverse needs: homebrewing (OG/FG gravity readings), beverage ABV analysis with standard drink conversion, dilution planning for spirits, cocktail mixing ABV calculation, and BAC (Blood Alcohol Concentration) estimation.
For homebrewers, the calculator uses two established formulas: the Standard formula ABV = (OG - FG) × 131.25, which is simple and widely used, and the Advanced formula ABV = 76.08 × (OG - FG) / (1.775 - OG) × (FG / 0.794), developed by C.J. Danilewicz in 2005, which accounts for ethanol production volume changes and provides more accuracy for high-gravity brews.
The standard drinks calculation follows the NIAAA definition: one standard drink contains 14 grams (0.6 fl oz) of pure alcohol. The BAC estimation uses the Widmark formula: BAC = [Alcohol(g) / (Body Weight(g) × r)] × 100 - (β × Hours), where r is the Widmark factor (0.68 for men, 0.55 for women) and β is the elimination rate (0.015%/hour).
The dilution calculator uses Pearson's Square method: Final Volume = (Source ABV / Target ABV) × Source Volume. The mixing calculator computes weighted average ABV: Mix ABV = Σ(Volumeᵢ × ABVᵢ) / ΣVolumeᵢ.
Input ranges: OG typically 1.030-1.120, FG typically 1.000-1.030. Beverage ABV: 0.5%-65%. Body weight: 30-300kg.
- Global DUI legal limits comparison across 15 countries
- Caloric impact analysis with 12-month weight gain projection
- Alcohol equivalence visualizer comparing drink types
- Standard and advanced ABV formulas for brewing accuracy
- Standard drink conversion following NIAAA guidelines
- Alcohol calorie calculation (7 cal/g pure alcohol)
- Spirits dilution planning with Pearson's Square method
- Multi-ingredient cocktail ABV calculator (up to 3 ingredients)
- BAC estimation with Widmark formula
- 12-hour BAC elimination timeline chart
- Visual ABV comparison bar chart
- Expert health and safety analysis
- Warning alerts for excessive consumption
- US Proof conversion (Proof = ABV × 2)
Frequently Asked Questions
How to calculate ABV when mixing alcohol?
To calculate the ABV of a mixed drink, use the weighted average formula: Mix ABV = (Volume₁ × ABV₁ + Volume₂ × ABV₂ + ...) / Total Volume. For example, mixing 50ml of 40% vodka with 200ml of 5% beer gives: (50×40 + 200×5) / (50+200) = (2000+1000) / 250 = 12% ABV.
Can you calculate ABV at home?
Yes. For homebrewing, measure the Original Gravity (OG) before fermentation and Final Gravity (FG) after fermentation using a hydrometer. Then apply the formula: ABV = (OG - FG) × 131.25. For example, OG 1.050 and FG 1.010 gives (1.050 - 1.010) × 131.25 = 5.25% ABV.
Is 40% alcohol by volume the same as 80 proof?
Yes. In the United States, proof is simply ABV multiplied by 2. So 40% ABV = 80 proof. This standard dates back to 1848 when proof spirit was defined as spirit containing 50% alcohol by weight, which equals approximately 57.15% ABV by volume.
What BAC will 2 beers get you?
For a 70kg man drinking 2 standard beers (5% ABV, 12oz each = 2 standard drinks) over 2 hours, estimated BAC ≈ 0.035%. For a 60kg woman under the same conditions, BAC ≈ 0.054%. These are estimates; actual BAC depends on food intake, metabolism, and individual factors.
What is the 2 2 2 rule for alcohol?
The 2-2-2 rule suggests: no more than 2 standard drinks per day, no more than 2 drinking days per week without a break, and at least 2 alcohol-free days per week. This guideline helps reduce health risks associated with regular alcohol consumption and allows the body time to recover.
What alcoholic drink doesn't raise blood sugar?
Pure spirits (vodka, gin, whiskey at 40% ABV) contain virtually zero carbohydrates and do not directly raise blood sugar. Dry wines and light beers have minimal carbs (1-4g per serving). However, mixers like juice, soda, and tonic water can significantly increase sugar content. Always consult your doctor for personalized advice.