Multiply the number of cups by 236.588
1 US cup equals approximately 237 milliliters (236.588 ml exactly).
0.5 cup equals about 118 ml (118.294 ml exactly). This is the same as 1/2 cup.
1/4 cup (0.25 cup) equals approximately 59 ml (59.147 ml exactly).
3/4 cup (0.75 cup) equals approximately 177 ml (177.441 ml exactly).
1/3 cup (about 0.333 cup) equals approximately 79 ml (78.863 ml exactly).
2 US cups equal approximately 473 ml (473.176 ml exactly).
A metric cup (used in the UK, Australia, and most recipes outside the US) is exactly 250 ml. A US cup is approximately 237 ml. A UK imperial cup is 284 ml.
Multiply the number of cups by 236.588 for US cups, or by 250 for metric cups. Example: 0.5 US cups × 236.588 = 118.3 ml.