Definition
The horizontal distance an airplane travels along the runway surface from the start of the takeoff roll until the moment its wheels leave the ground. It is measured on the runway only and does not include any distance flown after liftoff.
Plain English
How far the airplane rolls down the runway before the wheels lift off.
Context Anchor
Seen in takeoff performance charts and preflight planning when deciding whether a runway is long enough for the planned takeoff.
Derivation
“Takeoff” means the act of becoming airborne. “Roll” points to the wheels rolling along the runway. Together, the phrase focuses on the ground portion of the takeoff, not the climb after liftoff.
Why Pilots Care
It determines whether available runway length is sufficient for a safe takeoff under given weight, wind, and density altitude conditions.
Intuition Check
Do not assume takeoff roll distance means the total distance needed to take off and clear an obstacle. It means only the runway distance used while the airplane is still on the ground, up to liftoff.
Example Sentence 1
On a hot day at a high-elevation airport, the pilot calculated a takeoff roll distance of 2,400 feet and confirmed the runway was long enough.
Example Sentence 2
Hot weather and high humidity increase the takeoff roll distance needed to reach rotation speed.