What is a 1955 d worth?

1955 d what? Penny, nickel, dime, quarter, half, or dollar.

sorry. It is a penny

If it happened to be a double die or struck twice when it was made, it could be up to A$1,500 in good condition. If it is just a regular penny, you can buy a new uncirculated one for $20. Much use or wear and it's probably just a penny.