Ketubah: 200 Zuz
I see that my marriage ketubah says it is worth 200 zuz. What is the equivalent of 200 zuz in American dollars?
The Aish Rabbi Replies
Let's see: In the Passover Haggadah we sing about "the goat my father bought for two zuzim." So I guess your ketubah is worth the equivalent of 100 baby goats.
But seriously: The rabbinic sources say that a Zuz [Dinar] is the equivalent of 3.5078250 grams of pure silver. This was established at the time of the Second Temple Era and is practiced today.
According to that figure, 200 zuz comes out to 701.565 grams of pure silver. This is equivalent to 24.7466 ounces of pure silver. At $30 US per ounce of silver, the total value of 200 zuz is approximately $750.
There is nothing that prevents the husband from increasing the sum specified in the Ketubah to beyond that demanded by the strict letter of the law.
(sources: Bechoros 5, with Tosfos; Baba Basra 90a, with Tosfos; Maimonides - Laws of Shekalim; Igros Moshe - EH Part 1:101; Sefer Mesoras HaShekel)