Convert british proof (historic)s to us proofs
1 proof (UK) = 1.14285714286 proof (US) — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
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Show this value in all 6 alcohol strength units
- Volume fractions v/v 0.005 714 285 714 29
- Percent alcohol by volumes % ABV 0.571 428 571 429
- Degree Gay-Lussacs °GL 0.571 428 571 429
- Per mille alcohol by volumes ‰ ABV 5.714 285 714 29
- US proofs proof (US) 1.142 857 142 86
- British proof (historic)s proof (UK) 1
Every row is British proof (historic) (proof (UK)) converted through the volume fraction, in exact rational arithmetic.
How to convert british proof (historic)s to us proofs
Multiply the number of british proof (historic)s by 1.14285714286 to get us proofs.
British proof (historic): Historic convention: 100 proof equals 4/7 alcohol by volume. Modern UK labels use ABV.
British proof (historic) to US proof conversion table
| British proof (historic)s (proof (UK)) | US proofs (proof (US)) |
|---|---|
| 1 proof (UK) | 1.142 857 1 |
| 2 proof (UK) | 2.285 714 3 |
| 3 proof (UK) | 3.428 571 4 |
| 5 proof (UK) | 5.714 285 7 |
| 10 proof (UK) | 11.428 571 |
| 20 proof (UK) | 22.857 143 |
| 25 proof (UK) | 28.571 429 |
| 50 proof (UK) | 57.142 857 |
| 100 proof (UK) | 114.285 71 |
| 250 proof (UK) | 285.714 29 |
| 500 proof (UK) | 571.428 57 |
| 1000 proof (UK) | 1142.8571 |
US proof to British proof (historic) conversion table
| US proofs (proof (US)) | British proof (historic)s (proof (UK)) |
|---|---|
| 1 proof (US) | 0.875 |
| 2 proof (US) | 1.75 |
| 3 proof (US) | 2.625 |
| 5 proof (US) | 4.375 |
| 10 proof (US) | 8.75 |
| 20 proof (US) | 17.5 |
| 25 proof (US) | 21.875 |
| 50 proof (US) | 43.75 |
| 100 proof (US) | 87.5 |
| 250 proof (US) | 218.75 |
| 500 proof (US) | 437.5 |
| 1000 proof (US) | 875 |
Frequently asked
How many us proofs are in a british proof (historic)?
One british proof (historic) equals 1.142857143 us proofs (proof (UK) → proof (US)). That figure is exact, not rounded.
How do you convert british proof (historic)s to us proofs?
Multiply the number of british proof (historic)s by 1.14285714286 to get us proofs.
What is 1 proof (US) in british proof (historic)s?
One us proof is 0.875 british proof (historic)s.
What is 10 proof (UK) in proof (US)?
10 proof (UK) = 11.428 571 proof (US).
What exactly is a british proof (historic)?
Historic convention: 100 proof equals 4/7 alcohol by volume. Modern UK labels use ABV.