There is no definitive answer to this question as it depends on the size and shape of the tablespoon you are using. A standard tablespoon holds around 15ml (0.51 fl oz) of liquid, but this can vary depending on the manufacturer. This means that 1 tablespoon contains around 60mg of liquid. However, if you are using a smaller or larger tablespoon, the amount of liquid will be different and so the conversion will not be accurate.