Fuel Management System (Fly-X) is a system that automates fuel calculation for a certain flight, certain weight and certain environment condition. It also produce flight planning document in such airway selected. Fly-X calculates the fuel required for a flight based on actual weight of payload from the check-in desk and no rounded number takes account. It will produce accurate and fast result of number of economic fuel required. Fly-X is an offline system so that it can be used anywhere else that requires fuel calculation.