'Ounce' in the Bible

Everyone who is registered must pay half a shekel according to the sanctuary shekel (20 gerahs to the shekel). This half shekel is a contribution to the Lord.

2⁄5 of an ounce per man, that is, half a shekel according to the sanctuary shekel, from everyone 20 years old or more who had crossed over to the registered group, 603,550 men.