US proof to alcohol by volume
Type a value in proof to get it in % ABV instantly.
20% ABV
That's about the same as fortified wine. A 330 ml serving holds about 6.6 alcohol units.
Convert the other way: % ABV to proof
What it means
How strong is that?
Alcohol units use 10 ml of pure alcohol, the UK and EU standard, for a 330 ml serving. Guidance differs by country.
The math
How to convert proof to % ABV
To convert US proof to alcohol by volume, multiply by 0.5.
Example: 40 proof × 0.5 = 20 % ABV.
In the other direction, 1 % ABV = 2 proof.
Every unit
Your strength in every unit
Tables
proof to % ABV conversion table
| proof | % ABV |
|---|---|
| 3 proof | 1.5 % ABV |
| 4 proof | 2 % ABV |
| 5 proof | 2.5 % ABV |
| 8 proof | 4 % ABV |
| 12 proof | 6 % ABV |
| 14 proof | 7 % ABV |
| 20 proof | 10 % ABV |
| 30 proof | 15 % ABV |
| 40 proof | 20 % ABV |
| 43 proof | 21.5 % ABV |
| 50 proof | 25 % ABV |
| 57 proof | 28.5 % ABV |
| 60 proof | 30 % ABV |
| 70 proof | 35 % ABV |
% ABV to proof conversion table
| % ABV | proof |
|---|---|
| 3 % ABV | 6 proof |
| 4 % ABV | 8 proof |
| 5 % ABV | 10 proof |
| 8 % ABV | 16 proof |
| 12 % ABV | 24 proof |
| 14 % ABV | 28 proof |
| 20 % ABV | 40 proof |
| 30 % ABV | 60 proof |
| 40 % ABV | 80 proof |
| 43 % ABV | 86 proof |
| 50 % ABV | 100 proof |
| 57 % ABV | 114 proof |
| 60 % ABV | 120 proof |
| 70 % ABV | 140 proof |
Quick answers
Quick answers
- How many % ABV is 1 proof?
- 1 proof is 0.5 % ABV.
- How many % ABV is 10 proof?
- 10 proof is 5 % ABV.
- How many % ABV is 40 proof?
- 40 proof is 20 % ABV.
The units
About these units
US proof (proof)
Exactly twice the ABV. A bottle at 80 proof is 40% alcohol.
Alcohol by volume (% ABV)
The standard measure: what share of the liquid is pure alcohol by volume.
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