1 U.S. tablespoon = 1/2 U.S. fl. oz (14.8 ml)
The traditional British tablespoon was never standardised, and could vary from 1/2 to 5/8 imperial fl. oz. (14.2 ml to 17.8 ml)
1 metric tablespoon = 15 ml (in Canada, New Zealand, UK)
1 metric tablespoon = 20 ml (in Australia)