In 1850, a pound was worth the equivalent of 94.12 pounds today. In 1890, it was worth slightly less.
If you are talking about cash (GB Pound bills) worth 200 pounds from 1800, they would still be worth the same 200 pounds today and would remain to be worth the same 200 pounds a hundred years from now. If you are talking about investments like bank deposits or shares or bonds etc., then the value would have varied depending on the rate of returns of the instrument in which the money was deposited.
The rates change every day. Use this currency converter to calculate it.
307 million $
1
how much is a painting 18 hundreds The fleet W. A. Knell
It is worth 1800$
250
£9
Coins from the Atocha wreck are worth $1800 to over $2000.
It is $1800
1800
About $300,000 today
There are 100 pennies in a dollar, so divide 1800 by 100 and you get 18 dollars.
1800 bells
10000
I sold mine in eBay for $1800