400m every lane is the same distance.
Yes, the above is true in a 400 metre race!
However, if you are training or running for fitness or pleasure on a track, signs often tell you not to run on the inside lane, and you may wonder like I have what the distance is around various lanes.
See the answer in this website to: "What is the length of each lane on a running track?"
The line around which you run in lane #6 is approximately 440 meters long (439.898 meters long, to be mathematically more precise).