44 ml (1.5 US fl oz) or 43 ml (1.5 imp fl oz) 71 ml (2.5 imp fl oz) In Canada, a shot may refer to an official standard drink of 1.5 imperial fluid ounces or 42.6 millilitres, though many establishments serve a standard drink of 1 oz. However, shot glasses available in Canada typically are manufactured according to US fluid ounces rather than imperial, making them about 4% larger. Denmark: 20 ml: 40 ml: Estonia: 20 or 30 ml: 40 ml