How much is 250 Guineas in American money?

Answer 1

A "guinea" is an old British coin, worth variably from one pound (20 shillings) up to about 30 shillings depending on the current value of gold. The value was eventually fixed at 21 shillings.

If you're reading a story from, say, the 18th century where the characters are talking about money, you'd need to first convert it to American currency of the time, and then convert that to modern values, to get any idea of how much money it is.

50 guineas would have been a substantial sum, though ... a guinea was a 22 karat gold coin, of which there were 44.5 to the (troy) pound. So 50 guineas is about a pound of gold.