Koji (大倉浩二) Okura
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Born : 1955
Cat. M70 Ultrarunner since 2014
16
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
33
DUV-index+ ?Largest integer N such that the race distances provide at least N complete segments of N km in total. A single long race may therefore contribute several segments. See the DUV-Index tab for the detailed calculation. calculation details
1
Countries visited ?Japan
Japan60,3%
Rank quotient ?This runner's calculation uses 16 eligible race(s): Σ(rank − 1) = 6 988; Σ finishers = 11 586. 6 988 / 11 586 × 100 = 60.31%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed16
Km — ultra races1 345 km
Longest race100,0 km
8th Okinawa 100km Ultramarathon — 21/12/2025
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road89,6%
Trail10,4%
Records
HISTORY
16 race(s)| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 21/12/2025 | 8th Okinawa 100km Ultramarathon | 100,00 | ×3 |
| ✓ 2 | 20/4/2025 | 35th Fuji 4 Lakes 100 km Challenge | 100,00 | ×3 |
| ✓ 3 | 30/6/2024 | 39. Lake Saroma 100 km Ultramarathon | 100,00 | ×3 |
| ✓ 4 | 15/10/2023 | 29th River Shimanto 100km | 100,00 | ×3 |
| ✓ 5 | 21/5/2023 | 11th Tokyo Shibamata 100 km | 100,00 | ×3 |
| ✓ 6 | 19/6/2022 | 15. Okinoshima 100km Ultra Marathon | 100,00 | ×3 |
| ✓ 7 | 22/4/2018 | 10th 100 km Ultra Maranic Osaka | 100,00 | ×3 |
| ✓ 8 | 12/6/2016 | 5th Hida Takayama 100 km Ultramarathon | 100,00 | ×3 |
| ✓ 9 | 8/6/2014 | 3rd Hida Takayama 72 km Ultramarathon | 72,00 | ×2 |
| ✓ 10 | 8/6/2025 | 13th Hida Takayama 71 km Ultramarathon | 71,00 | ×2 |
| ✓ 11 | 3/5/2024 | 32. Mukogawa Yurikamome Ultra Marathon | 70,00 | ×2 |
| ✓ 12 | 3/5/2022 | 30. Mukogawa Yurikamome Ultra Marathon | 70,00 | ×2 |
| ✓ 13 | 24/4/2016 | 8th 70 km Ultra Maranic Osaka | 70,00 | ×2 |
| ✓ 14 | 17/5/2026 | 32th Yatsugatake Nobeyama 68 km | 68,00 | ×2 |
| ✓ 15 | 28/9/2025 | 28th Muraoka 64 km Ultra Marathon | 64,00 | ×1 |
| ✓ 16 | 15/9/2019 | 19th Tango 60 km Ultramarathon | 60,00 | ×1 |