Masahiro (黒田昌宏) Kuroda

Born : 1974 Cat. M50 Ultrarunner since 2010

DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.

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

Countries visited ?

Japan

66,8%

Rank quotient ?This runner's calculation uses 79 eligible race(s): Σ(rank − 1) = 26 218; Σ finishers = 39 267. 26 218 / 39 267 × 100 = 66.77%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed81

Km — ultra races10 027 km

> 100 km38

> 160 km16

> 200 km13

> 24h3

Longest race516,0 km

20th River Road Foot Race 514 km — 30/4/2025

Km per year (ultra races)

481

2022

626

2023

926

2024

849

2025

530

2026

Race types (share of distance)

Road92,1%

Trail5,7%

Stage2,2%

Records

50 km7h04'05 100 km13h06'06 6 h57,47 km 24 h147,05 km

HISTORY

80 race(s) · 2 stage(s) nested

Date		Race	Perf.	Rk
2026
19.07	207km	4th Round of the Boso Peninsula 210K	43:57:45 h	30
30.05	63km	10th Yokosuka Miura 63km Michikusa Ultra Marathon	8:22:13 h	45
11.04	60km	21st Toda Saiko 60 km	7:37:46 h	134
14.03	200km	16th Little Edo Oedo 200k	34:32:56 h	184
2025
15.11	142km	7th Autumn leaves in Okumusashi / Chichibu Journey run	22:00:27 h	47
19.10	70km	32. Ultramarathon Okumusashi	8:58:27 h	263
30.04	516km	20th River Road Foot Race 514 km	5d 07:53:19 h	58
20.04	50km	6th Yamadera Zao 50 km Ultra Marathon	7:04:05 h	51
12.04	71km	20th Toda Saiko 70 km	8:21:44 h	159
2024
02.11	142km	6th Autumn leaves in Okumusashi / Chichibu Journey run	22:23:14 h	55
20.10	70km	31. Ultramarathon Okumusashi	9:24:05 h	409
30.04	514km	19th River Road Foot Race 514 km	5d 11:57:12 h	89
09.03	200km	14th Little Edo Oedo 200k	35:26:04 h	208
2023
18.11	130km	1st Mito Kaido Journey run	21:32:48 h	60
28.10	147km	5th Autumn leaves in Okumusashi / Chichibu Journey run	25:32:10 h	160
04.06	78km	30. Ultramarathon Okumusashi	10:46:48 h	601
08.04	71km	18th Toda Saiko 70 km	8:33:38 h	170
11.03	200km	13th Little Edo Oedo 200k	35:27:01 h	204
2022
29.10	146km	4th Autumn leaves in Okumusashi / Chichibu Journey run	23:27:14 h	80
03.09	121km	2nd Tone River Run Up Journey Run Upstream	21:41:38 h	35
05.06	78km	29. Ultramarathon Okumusashi	10:08:13 h	576
21–22.03	136km/2stages	10th Arakawa Riverside Journey Stage Race	20:05:00 h	62
21.03	81.6km	10th Arakawa Riverside Journey Stage Race - Stage 1	11:26:00 h	65
22.03	55.4km	10th Arakawa Riverside Journey Stage Race - Stage 2	8:39:00 h	68
2021
30.10	146km	3rd Autumn leaves in Okumusashi / Chichibu Journey run	25:10:25 h	217
16.10	120km	1st Tone River Run Up Journey Run Upstream	19:36:00 h	45
04.07	8h	27th 8-Hour Endurance Race Tokorozawa	58.800 km	234
03.05	251km	16th River Road Foot Race 254 km	2d 05:19:54 h	37
10.04	70km	16th Toda Saiko 70 km	8:42:50 h	384
2020
22.08	63.7km	1st Toda Aya Lake Ultra Marathon	9:22:52 h	112
05.07	8h	26th 8-Hour Endurance Race Tokorozawa	63.700 km	115
22.02	206km	10th Little Edo Oedo 205k	34:43:39 h	184
2019
02.11	145km	1st Autumn leaves in Okumusashi / Chichibu Journey run	23:23:19 h	100
14.09	24h	14. Shonan Int. Relay Marathon 24 Hour Run	136.700 km	39
17.08	101km	7th World Cultural Heritage "Fuji" Foot Race	15:46:22 h	119
02.06	78km	26. Ultramarathon Okumusashi	10:28:03 h	1044
19.05	100km	25th Yatsugatake Nobeyama 100 km	13:50:45 h	1393
03.05	254km	15th River Road Foot Race 254 km	2d 09:01:20 h	53
13.04	70km	14th Toda Saiko 70 km	8:13:05 h	357
16.03	80km	7th Arakawa Riverside Journey Stage Race - Stage 1	11:13:42 h	95
23.02	204km	9th Little Edo Oedo 200k	35:20:27 h	219
2018
03.06	78km	25. Ultramarathon Okumusashi	10:42:59 h	937
20.05	100km	24th Yatsugatake Nobeyama 100 km	13:52:27 h	1448
03.05	254km	14th River Road Foot Race 254 km	2d 06:40:45 h	39
14.04	70km	13th Toda Saiko 70 km	8:28:02 h	468
03.03	204km	8th Little Edo Oedo 200k	35:05:01 h	189
2017
09.09	24h	20. Hiratsuka 24 hour race	100.340 km	61
04.06	78km	24. Ultramarathon Okumusashi	10:05:35 h	883
21.05	100km	23rd Yatsugatake Nobeyama 100 km	13:46:37 h	878
03.05	254km	13th River Road Foot Race 254 km	2d 07:50:17 h	51
04.03	204km	7th Little Edo Oedo 200k	33:55:06 h	154
2016
18.09	144km	19th Karisakatoge beyond Chichibu Run	25:31:56 h	113
03.07	8h	22th 8-Hour Endurance Race Tokorozawa - 3 tai	55.182 km	66
05.06	78km	23. Ultramarathon Okumusashi	9:55:03 h	853
24.04	118km	26th Fuji 5 Lakes 118 km Challenge	14:34:00 h	460
05.03	204km	6th Little Edo Oedo 200k	33:09:54 h	111
2015
06.12	6h	4th Coedo Kawagoe 6 Hours Run	51.000 km	20
20.09	153km	18th Karisakatoge beyond Chichibu Run	24:18:41 h	110
12.07	8h	21th 8-Hour Endurance Race Tokorozawa - 3 tai	52.688 km	74
22.06	77km	22. Ultramarathon Okumusashi	8:43:56 h	436
17.05	100km	21st Yatsugatake Nobeyama 100 km	13:45:57 h	1188
19.04	118km	25th Fuji 5 Lakes 118 km Challenge	14:26:10 h	411
28.02	203km	5th Little Edo Oedo 200k	34:53:45 h	175
2014
07.12	6h	3rd Coedo Kawagoe 6 Hours Run	55.100 km	19
13.09	24h	17. Hiratsuka 24 hour race	147.050 km	16
27.07	77km	21. Ultramarathon Okumusashi	10:26:35 h	577
06.07	8h	20th 8-Hour Endurance Race Tokorozawa - 3 tai	55.182 km	65
18.05	100km	20th Yatsugatake Nobeyama 100 km	13:37:40 h	891
20.04	108km	24th Fuji 5 Lakes 108 km Challenge	13:03:13 h	301
2013
01.12	6h	2nd Coedo Kawagoe 6 Hours Run	55.700 km	15
28.07	77km	20. Ultramarathon Okumusashi	9:04:15 h	450
01.06	100km	1st Tokyo Shibamata 100 km	13:06:06 h	815
19.05	100km	19th Yatsugatake Nobeyama 100 km	13:24:10 h	757
21.04	112km	23rd Fuji 5 Lakes 112 km Challenge	13:43:18 h	130
2012
09.12	6h	1st Coedo Kawagoe 6 Hours Run	57.470 km	10
05.08	77km	19. Ultramarathon Okumusashi	10:20:44 h	649
20.05	100km	18th Yatsugatake Nobeyama 100 km	13:19:50 h	622
22.04	112km	22nd Fuji 5 Lakes 112 km Challenge	14:08:43 h	371
2011
09.10	71.5km	19th Hasetsune Cup - Japan Mountain Endurance Race	21:47:21 h	1542
07.08	77km	18. Ultramarathon Okumusashi	9:53:33 h	594
30.04	112km	21st Fuji 5 Lakes 112 km Challenge	14:22:53 h	377
2010
01.08	77km	17. Ultramarathon Okumusashi	10:40:52 h	639

Filter

Runner	Races in common

DUV-index calculation details

#	Date	Race	Credited km	DUV-index+
✓ 1	30/4/2025	20th River Road Foot Race 514 km	516,00	×6
✓ 2	30/4/2024	19th River Road Foot Race 514 km	514,00	×6
✓ 3	3/5/2019	15th River Road Foot Race 254 km	254,00	×3
✓ 4	3/5/2018	14th River Road Foot Race 254 km	254,00	×3
✓ 5	3/5/2017	13th River Road Foot Race 254 km	254,00	×3
✓ 6	3/5/2021	16th River Road Foot Race 254 km	251,00	×3
✓ 7	19/7/2026	4th Round of the Boso Peninsula 210K	207,00	×2
✓ 8	22/2/2020	10th Little Edo Oedo 205k	206,00	×2
✓ 9	23/2/2019	9th Little Edo Oedo 200k	204,00	×2
✓ 10	3/3/2018	8th Little Edo Oedo 200k	204,00	×2
✓ 11	4/3/2017	7th Little Edo Oedo 200k	204,00	×2
✓ 12	5/3/2016	6th Little Edo Oedo 200k	204,00	×2
✓ 13	28/2/2015	5th Little Edo Oedo 200k	203,00	×2
✓ 14	14/3/2026	16th Little Edo Oedo 200k	200,00	×2
✓ 15	9/3/2024	14th Little Edo Oedo 200k	200,00	×2
✓ 16	11/3/2023	13th Little Edo Oedo 200k	200,00	×2
✓ 17	20/9/2015	18th Karisakatoge beyond Chichibu Run	153,00	×1
✓ 18	13/9/2014	17. Hiratsuka 24 hour race	147,05	×1
✓ 19	28/10/2023	5th Autumn leaves in Okumusashi / Chichibu Journey run	147,00	×1
✓ 20	29/10/2022	4th Autumn leaves in Okumusashi / Chichibu Journey run	146,00	×1
✓ 21	30/10/2021	3rd Autumn leaves in Okumusashi / Chichibu Journey run	146,00	×1
✓ 22	2/11/2019	1st Autumn leaves in Okumusashi / Chichibu Journey run	145,00	×1
✓ 23	18/9/2016	19th Karisakatoge beyond Chichibu Run	144,00	×1
✓ 24	15/11/2025	7th Autumn leaves in Okumusashi / Chichibu Journey run	142,00	×1
✓ 25	2/11/2024	6th Autumn leaves in Okumusashi / Chichibu Journey run	142,00	×1
✓ 26	14/9/2019	14. Shonan Int. Relay Marathon 24 Hour Run	136,70	×1
✓ 27	21/3/2022	10th Arakawa Riverside Journey Stage Race	136,00	×1
✓ 28	18/11/2023	1st Mito Kaido Journey run	130,00	×1
✓ 29	3/9/2022	2nd Tone River Run Up Journey Run Upstream	121,00	×1
✓ 30	16/10/2021	1st Tone River Run Up Journey Run Upstream	120,00	×1
✓ 31	24/4/2016	26th Fuji 5 Lakes 118 km Challenge	118,00	×1
✓ 32	19/4/2015	25th Fuji 5 Lakes 118 km Challenge	118,00	×1
✓ 33	21/4/2013	23rd Fuji 5 Lakes 112 km Challenge	112,00	×1
✓ 34	22/4/2012	22nd Fuji 5 Lakes 112 km Challenge	112,00	×1
✓ 35	30/4/2011	21st Fuji 5 Lakes 112 km Challenge	112,00	×1
✓ 36	20/4/2014	24th Fuji 5 Lakes 108 km Challenge	108,00	×1
✓ 37	17/8/2019	7th World Cultural Heritage "Fuji" Foot Race	101,00	×1
✓ 38	9/9/2017	20. Hiratsuka 24 hour race	100,34	×1
✓ 39	19/5/2019	25th Yatsugatake Nobeyama 100 km	100,00	×1
✓ 40	20/5/2018	24th Yatsugatake Nobeyama 100 km	100,00	×1
✓ 41	21/5/2017	23rd Yatsugatake Nobeyama 100 km	100,00	×1
✓ 42	17/5/2015	21st Yatsugatake Nobeyama 100 km	100,00	×1
✓ 43	18/5/2014	20th Yatsugatake Nobeyama 100 km	100,00	×1
✓ 44	1/6/2013	1st Tokyo Shibamata 100 km	100,00	×1
✓ 45	19/5/2013	19th Yatsugatake Nobeyama 100 km	100,00	×1
✓ 46	20/5/2012	18th Yatsugatake Nobeyama 100 km	100,00	×1
✓ 47	4/6/2023	30. Ultramarathon Okumusashi	78,00	×1
✓ 48	5/6/2022	29. Ultramarathon Okumusashi	78,00	×1
✓ 49	2/6/2019	26. Ultramarathon Okumusashi	78,00	×1
✓ 50	3/6/2018	25. Ultramarathon Okumusashi	78,00	×1
✓ 51	4/6/2017	24. Ultramarathon Okumusashi	78,00	×1
✓ 52	5/6/2016	23. Ultramarathon Okumusashi	78,00	×1
✓ 53	22/6/2015	22. Ultramarathon Okumusashi	77,00	—
✓ 54	27/7/2014	21. Ultramarathon Okumusashi	77,00	—
✓ 55	28/7/2013	20. Ultramarathon Okumusashi	77,00	—
✓ 56	5/8/2012	19. Ultramarathon Okumusashi	77,00	—
✓ 57	7/8/2011	18. Ultramarathon Okumusashi	77,00	—
✓ 58	1/8/2010	17. Ultramarathon Okumusashi	77,00	—
✓ 59	9/10/2011	19th Hasetsune Cup - Japan Mountain Endurance Race	71,50	—
✓ 60	12/4/2025	20th Toda Saiko 70 km	71,00	—
✓ 61	8/4/2023	18th Toda Saiko 70 km	71,00	—
✓ 62	19/10/2025	32. Ultramarathon Okumusashi	70,00	—
✓ 63	20/10/2024	31. Ultramarathon Okumusashi	70,00	—
✓ 64	10/4/2021	16th Toda Saiko 70 km	70,00	—
✓ 65	13/4/2019	14th Toda Saiko 70 km	70,00	—
✓ 66	14/4/2018	13th Toda Saiko 70 km	70,00	—
67	22/8/2020	1st Toda Aya Lake Ultra Marathon	63,70	—
68	5/7/2020	26th 8-Hour Endurance Race Tokorozawa	63,70	—
69	30/5/2026	10th Yokosuka Miura 63km Michikusa Ultra Marathon	63,00	—
70	11/4/2026	21st Toda Saiko 60 km	60,00	—
71	4/7/2021	27th 8-Hour Endurance Race Tokorozawa	58,80	—
72	9/12/2012	1st Coedo Kawagoe 6 Hours Run	57,47	—
73	1/12/2013	2nd Coedo Kawagoe 6 Hours Run	55,70	—
74	3/7/2016	22th 8-Hour Endurance Race Tokorozawa - 3 tai	55,18	—
75	6/7/2014	20th 8-Hour Endurance Race Tokorozawa - 3 tai	55,18	—
76	7/12/2014	3rd Coedo Kawagoe 6 Hours Run	55,10	—
77	12/7/2015	21th 8-Hour Endurance Race Tokorozawa - 3 tai	52,69	—
78	6/12/2015	4th Coedo Kawagoe 6 Hours Run	51,00	—
79	20/4/2025	6th Yamadera Zao 50 km Ultra Marathon	50,00	—