According to the Professional Coin Grading Service (PCGS), a 1903 liberty head nickel in good condition is worth around $1.00. However, the value can vary depending on the condition of the coin, its mint mark, and its rarity. For example, a 1903 liberty head nickel in mint condition can be worth up to $20, while a rare 1903 nickel with the "S" mint mark can be worth up to $100.