Wedgewood's price goes on increasing with it's age. You can estimate it's price referring to similar items on an auction.
2 Additional Answers
Factors such as the age and conditon of a wedgewood plate will determine how much it is worth. Rare and plates with beautiful authentic designs fetch hidher prices on the market too.
Any pieces of Wedgewood made by Josiah Wedgewood is worth money today. Some is worth more than others. Smaller pieces could be worth from $500 up to around $1,000. Larger pieces could be worth as much as $10,000.