gerah

thumb|right|150 px|Obverse of a Judean silver Yehud coin from the Persian era (.58 gram), with falcon or eagle and [[Paleo Hebrew inscription "יהד" "Yehud" (Judaea). Denomination is a ma'ah]] A gerah () is an ancient Hebrew unit of weight and currency, which, according to the Torah (Exodus 30:13, Leviticus 27:25, Numbers 3:47, 18:16), was equivalent to of a standard "sacred" shekel.

A gerah is known in Aramaic, and usually in Rabbinic literature, as a ''ma'ah (מעה; Mishnah Hebrew pl''. ma'ot "מעות" which means "coins"). It was originally a fifth of a denarius or zuz, as seen in the Torah and in Ezekiel (45:12), then became a sixth of a dinar/zuz, such as the coinage of Persian-era Yehud, which came in two denominations: approximately 0.58 gram for the ''ma'ah and approximately .29 gram for the half ma'ah (chatzi ma'ah). .58 × 6 = 3.48 grams, which is about the weight of a zuz/denarius based on a 14 gram shekel.