As of February 2015, it costs approximately $110 for an American adult to renew a passport. However, the cost can vary depending on the circumstances under which it is being renewed.
A passport can be renewed via mail or in person, although the DS-82 form is required for a passport renewal. This form eliminates an execution fee that is charged with first-time applications. Expedited services cost around $60, and overnight delivery costs approximately $15.
For anyone under 16 years of age to renew a passport, it costs about $80 plus the execution fee. The passport for a minor must be renewed in person.