How does fuel burned on the ground impact the weight of an aircraft?

When fuel is burned while the aircraft is on the ground, it directly reduces the total weight of the aircraft, which contributes to a decrease in the takeoff weight. The takeoff weight is calculated from the ramp weight (which includes all fuel, cargo, passengers, and the aircraft itself) minus any fuel that has been consumed prior to takeoff. Thus, any fuel burned while the aircraft is stationary on the ground will decrease the overall weight that the aircraft must lift during takeoff, leading to potentially improved performance metrics such as required takeoff runway length and climb rate.

This concept is crucial for pilots as it highlights the importance of weight management and how even small amounts of fuel consumption can have an impact on aircraft performance calculations.