Running Track
Courts & Fields · 9 specs
Direct Answer
Official outdoor running tracks are regulated by World Athletics (Track and Field Facilities Manual). The standard 400 m Standard Oval consists of two semicircles of 36.50 m inner radius joined by two straightaways of 84.39 m. An 8-to-9 lane track features lanes 1.22 m (4.0 ft) in width, with the 400 m distance measured precisely along the 30 cm measurement line of Lane 1.
Source: World Athletics Track and Field Facilities Manual Section 2: The 400m Standard Track · Last reviewed Aug 28, 2026
Specs
| Standard Track Length (Lane 1) | 400.00 m (measured 30 cm out from the inner kerb) |
| Straightaway Length | 84.39 m (276.87 ft × 2 straights) |
| Inside Curve Radius (R) | 36.50 m (119.75 ft inner boundary kerb radius) |
| Standard Lane Width | 1.22 m (4.00 ft ±0.01 m including 5 cm outer line) |
| Total Lane Count | 8 or 9 Lanes on competition tracks |
| Lane 2 Stagger Distance (400m) | 7.04 m ahead of Lane 1 |
| Lane 8 Stagger Distance (400m) | 53.03 m ahead of Lane 1 |
| Surface Thickness | 13.0–15.0 mm (Synthetic vulcanized rubber or PU sandwich) |
| Force Reduction Standard | 35–50 % shock absorption (EN 14877 / World Athletics) |
The 400m Mathematical Geometry & Lane Staggers
- Mathematical Layout: The inner kerb perimeter equals two 84.39 m straights (168.78 m) plus two semicircles of radius 36.50 m (2 × π × 36.50 = 229.34 m), totaling 398.12 m. When measured along the legal running line 30 cm out from the raised kerb (Radius 36.80 m), the perimeter calculates to exactly 400.00 m.
- Stagger Calculations: Because each outer lane adds 2πw (where w = 1.22 m lane width = 7.665 m per lap), 400 m runners in outer lanes start progressively ahead to ensure equal racing distances.