In general, a 1955 steel wheat penny in average condition is worth about $1. However, a penny that is in excellent condition or has a rare mint mark can be worth significantly more. For example, a 1955 S steel wheat penny (minted in San Francisco) in mint state condition can be worth over $100.
If you have a 1955 steel wheat penny and are interested in its value, it is best to consult with a professional coin dealer or grader. They can assess the condition and grade of your penny and provide you with an accurate estimate of its value.