How much the 747 weight on level fly 40000 ft?

The Boeing 747, depending on the specific model, typically has a maximum takeoff weight ranging from about 735,000 to 987,000 pounds. When flying at a cruising altitude of 40,000 feet, the aircraft's weight will be less than its maximum takeoff weight due to fuel consumption. Generally, a fully loaded 747 at cruising altitude might weigh around 600,000 to 700,000 pounds, depending on the configuration and fuel load.