Calculate track lane distances.
Only the straights are shared between lanes; the bends are longer the further out you run. Each lane sits one lane width further from the centre, and because the extra distance is the circumference of that offset — two pi times the radial displacement — a standard 1.22 m lane adds about 7.67 m per lap. World Athletics measures 30 cm from the inside kerb in lane 1 and 20 cm from the line in outer lanes, which is why the offset is applied from lane 2 outward.
Lane lap distance
Radial offset = (lane - 1) x lane width + measurement offset; extra distance per lap = 2 pi x radial offset; lane lap = lane 1 lap + extra
These figures are population-average estimates for training and recreational planning only and are not medical advice. Individual responses vary widely. Consult a qualified health professional before starting or significantly changing an exercise programme, particularly if you have any medical condition. Official dimensions, rules and timings should be confirmed against the governing body for your sport.
On a standard 400 m track with 1.22 m lanes, roughly 53 m per lap. That is why races over one lap use a staggered start.
Because runners do not hug the kerb exactly. Thirty centimetres in lane 1 and twenty from the line elsewhere approximates the real racing line.
The distance is equalised by the stagger, but outer lanes have gentler bends and no visual contact with rivals, which is why middle lanes are usually preferred.