Insights · Pool dimensions
Swimming Pool Dimensions
An Olympic swimming pool is 50 m long between the touch panels and at least 25 m wide, with a minimum depth of 2.5 m for the Olympic Games and World Aquatics Championships. Olympic pools use eight 2.5 m lanes with a 2.5 m gap outside the first and last lane; World Championships pools use ten lanes. Water must be 25–28 °C. Source: World Aquatics Competition Regulations – Swimming, in force February 2026, §15.
Key dimensions at a glance
| Element | Figure | Reference |
|---|---|---|
| Length between touch panels (long course) | 50.000 m | §15.1 |
| Length between touch panels (short course) | 25.000 m | §15.1 |
| Width, Olympic Games / World Championships | 25.000 m min. (26.000 m temporary pool) | §15.3 |
| Depth, Olympic Games / World Championships | 2.5 m min. | §15.4.1 |
| Depth, 25 m World Championships | 2.0 m min. (2.5 m recommended) | §15.4.2 |
| Depth, other World Aquatics events | 1.0 m min.; 1.35 m from 1 m to 6 m out where blocks are used | §15.4.3 |
| Lanes, Olympic Games | 8 × 2.5 m, plus 2.5 m outside lanes 1 and 8 | §15.6 |
| Lanes, World Championships (permanent pool) | 10: middle 8 × 2.5 m, outer 2 × 2.4 m | §15.6 |
| Lanes, other competitions | 2.5 m min. (outer lanes 2.4 m min.) | §15.6 |
| Water temperature | 25.0–28.0 °C | §15.11 |
| Starting platform height above water | 0.50–0.75 m | §15.8 |
| Backstroke flags | 1.8 m above water, 5.0 m from each end | §15.9 |
| Lighting, Olympic Games and World Aquatics events | 1,500 lux min. | §15.12 |
§ = World Aquatics Competition Regulations – Swimming (February 2026). Older documents number the same rules differently, including the former FINA Facilities Rules (“FR”).
Length and tolerances
The 50.000 m is measured between the touch panels. With panels at both ends, the wall-to-wall length must be 50.020–50.030 m; a 25 m pool needs 25.020–25.030 m (or 25.010–25.020 m with a panel at one end only) (§15.2). The tolerance applies from 0.3 m above to 0.8 m below the water surface — which is why a pool built to exactly 50 m wall to wall cannot be certified once panels are fitted.
Lanes, markings and walls
At the Olympic Games the pool has eight 2.5 m lanes and a 2.5 m gap outside the first and last lane, separated by lane ropes — 25 m in all. World Aquatics Championships pools have ten lanes. Lane markings on the floor are 0.2–0.3 m wide and end 2.0 m from each end wall in a 1.0 m cross line; they are 46.0 m long in a 50 m pool.
End walls are vertical and slip-resistant to at least 0.8 m below the surface, with any rest ledges at least 1.2 m down. Starting platforms stand 0.50–0.75 m above the water with a top at least 0.5 × 0.5 m.
Short-course and community pools
A 25 m pool for World Aquatics competition needs 25.000 m between panels; the 25 m World Championships require at least 2.0 m depth (2.5 m recommended). For other competitions, the minimum depth is 1.0 m, rising to 1.35 m for the first 1–6 m from any wall with starting blocks. Teaching and leisure water is a different design problem — shallower, warmer and often a separate body of water from the competition pool.
Figures that circulate but are wrong
- “Olympic pools are 2 m deep, 3 m recommended.” That comes from the older FINA Facilities Rules. For the Olympic Games and World Aquatics Championships the minimum is 2.5 m.
- “Olympic pool depth is 1.35 m.” That is the general minimum near blocks at other events.
- “An Olympic pool has 10 lanes.” The Olympic Games use 8 lanes with 2.5 m outer gaps; 10 lanes are used at World Championships.
- “It is 50.000 m wall to wall.” With touch panels at both ends it is 50.020–50.030 m.
What this means for a pool project
Pool length is a commitment: a 50 m pool, a 25 m pool and teaching water are different buildings with different plant rooms, halls and running costs. The pool hall’s environment — humidity, condensation, corrosion — and the deck and changing capacity decide whether it works.
See Planning a Swimming Pool Complex and Swimming Pool Design.
Sources
- World Aquatics — Competition Regulations, Swimming (in force February 2026), §15 (as published by the Slovenian Swimming Federation)
- World Aquatics — Competition Regulations page
- World Aquatics — Pool Certification (Swimming)
- FINA Facilities Rules 2021–2025 (superseded)
Figures checked against these documents on 2 Oct 2026. Where a figure is our own arithmetic from official values, the text says so.
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