How much is the entrance fee to Kakadu National Park?

The entrance fee for Kakadu National Park is free if booked online seven days in advance, otherwise, the cost of a vehicle annual park pass is $80, the cost of a three-day vehicle pass is $50, the cost of a seven-day vehicle pass is $75, and the cost of a two-week vehicle pass is $150. If entering the park on foot or by bicycle, there is no entrance fee.