The value of an error coin depends upon the nature of the error. Please examine your coin and then submit a new question with more information.
A Cent
Face value.
It's still worth 1 cent.
It really depends on how it was mistruck.The more impressive the error is, the more it is worth. Without having a description of the error, it can range from having no increase in value over a non-error coin to one potentially worth several hundred dollars.
The doubled die variety is worth $30-$50 in uncirculated condition. Any others are worth one cent.
It's worth one penny.
A wheat penny is worth about $1,000,000
A penny minted in 2013 is worth a penny, or 1 cent.
A penny from the 1811 is worth $150.00 to $1,110.00.
A penny is always worth a penny no matter what.
1 penny.
A penny