Track Lane Stagger Calculator
Turn lane width and straight length into the start-line stagger and lap length for every lane of a 400 m running track.
| Lane | 400 m race | 200 m race | Lap length |
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A 400 m oval has two equal straights and two semicircular bends, so the lane 1 measurement radius is (400 − 2 × straight) ÷ 2π. Lanes 2 and out are measured 20 cm from the line on their inside edge, while lane 1 is measured 30 cm from the kerb (or 20 cm from a painted line); the stagger for lane n is therefore 2π × ((n − 1) × lane width + 0.20 m − lane 1 offset). A 200 m race covers one bend, so its stagger is half the 400 m figure, and each lap length is 400 m plus that lane's stagger. Running-surface area counts the two straights plus the ring between the inside edge and the outside of the last lane. This is planning arithmetic only: official track measurement and certification require a survey, and this page does not set competition markings. Everything runs locally in your browser with no storage, uploads or network access.