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There are many units of measurement available. The standard unit of measurement for breathalysers is microgrammes of alcohol per 100ml of breath, or µg/100ml.
The English and Welsh drink driving limit is 35µg/100ml.
Other units of measurement include:
- mg/L
- %BAC
- milligrammes of alcohol per 100ml of blood or Permille
- milligrammes of alcohol per 100ml of urine
| µg/100ml | mg/L | %BAC | Permille ‰ | Urine | |
| 50 | 0.500 | 0.12 | 1.200 | 152 | |
| English/Welsh drink driving limit | 35 | 0.350 | 0.08 | 0.800 | 107 |
| Scottish drink drive limit | 22 | 0.220 | 0.05 | 0.500 | 67 |
| 15 | 0.150 | 0.04 | 0.350 | 46 | |
| European commercial drink drive limit | 9 | 0.090 | 0.02 | 0.200 | 28 |
| Zero | 0 | 0 | 0 | 0 | 0 |