Relevance. Rating Newest Oldest. Best Answer: one barrel = 117.347765 liters Edit: The barrel is the name of several units of volume: * Oil barrel: 42 US gallons, 158.9873 litres,[1] or 34.9723 Imperial (UK) gallons. * UK beer barrel: 36 UK gallons (163.7 litres).* US beer barrel: 31 US gallons (117.3 litres), the result of tax law definitions.* US non-beer liquid barrel: 31½ US gallons (119.2 litres), or half a hogshead. * US dry barrel: 105 dry quarts (115.6 litres). * Somali water barrel: 200 litres-used in Horn of Africa to measure water and diesel. US beer barrel: 31 US gallons (117.3 litres), the result of tax law definitions. * US non-beer liquid barrel: 31½ US gallons (119.2 litres), or half a hogshead. * US dry barrel: 105 dry quarts (115.6 litres). * Somali water barrel: 200 litres-used in Horn of Africa to measure water and diesel.