Jonathan Jones

Born : 1971 Cat. M55 Ultrarunner since 2021

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 ?

United Kingdom

48,5%

Rank quotient ?This runner's calculation uses 17 eligible race(s): Σ(rank − 1) = 1 586; Σ finishers = 3 273. 1 586 / 3 273 × 100 = 48.46%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed17

Km — ultra races1 775 km

> 100 km6

> 160 km5

Longest race160,9 km

2nd Winter Downs 100 — 12/12/2025

Km per year (ultra races)

491

2022

613

2023

2024

241

2025

138

2026

Race types (share of distance)

Trail100,0%

Records

50 km5h39'04 100 km18h45'04 50 mi9h51'53 100 mi22h47'45

HISTORY

17 race(s)

Date		Race	Perf.	Rk
2026
30.05	86mi	Ridgeway Challenge 86 Mile Trail Run	24:34:12 h	45
2025
12.12	100mi	2nd Winter Downs 100	30:27:21 h	57
20.09	50mi	10th Chiltern Wonderland 50	10:49:26 h	135
2024
21.09	50mi	9th Chiltern Wonderland 50	11:10:15 h	141
2023
14.10	100mi	12th Autumn 100 Mile Race	24:28:26 h	99
10.06	100mi	11th South Downs Way 100 Mile Race	28:53:50 h	168
06.05	100mi	12th Thames Path 100	23:39:51 h	89
18.03	31mi	1st Hundred Hills 50km	5:51:06 h	62
28.01	50mi	5th The Arc of Attrition 50 Mile	12:05:42 h	58
2022
12.11	50mi	6th Wendover Woods 50	12:04:17 h	83
17.09	50mi	7th Chiltern Wonderland 50	11:11:42 h	118
09.07	100km	8th Ultimate Lakeland Trails Challenge 100 km	18:45:04 h	50
21.05	50mi	11th North Downs Way 50 Mile Race	10:36:55 h	107
09.04	50mi	10th South Downs Way 50 Mile Race	9:51:53 h	152
08.01	43mi	14th Country to Capital	8:00:28 h	129
2021
16.10	100mi	10th Autumn 100 Mile Race	22:47:45 h	65
03.05	50km	Big Way Round	5:39:04 h	45

Filter

Runner	Races in common

DUV-index calculation details

#	Date	Race	Credited km	DUV-index+
✓ 1	12/12/2025	2nd Winter Downs 100	160,93	×4
✓ 2	14/10/2023	12th Autumn 100 Mile Race	160,93	×4
✓ 3	10/6/2023	11th South Downs Way 100 Mile Race	160,93	×4
✓ 4	6/5/2023	12th Thames Path 100	160,93	×4
✓ 5	16/10/2021	10th Autumn 100 Mile Race	160,93	×4
✓ 6	30/5/2026	Ridgeway Challenge 86 Mile Trail Run	138,40	×3
✓ 7	9/7/2022	8th Ultimate Lakeland Trails Challenge 100 km	100,00	×2
✓ 8	20/9/2025	10th Chiltern Wonderland 50	80,47	×2
✓ 9	21/9/2024	9th Chiltern Wonderland 50	80,47	×2
✓ 10	28/1/2023	5th The Arc of Attrition 50 Mile	80,47	×2
✓ 11	12/11/2022	6th Wendover Woods 50	80,47	×2
✓ 12	17/9/2022	7th Chiltern Wonderland 50	80,47	×2
✓ 13	21/5/2022	11th North Downs Way 50 Mile Race	80,47	×2
✓ 14	9/4/2022	10th South Downs Way 50 Mile Race	80,47	×2
✓ 15	8/1/2022	14th Country to Capital	69,20	×1
✓ 16	3/5/2021	Big Way Round	50,00	×1
✓ 17	18/3/2023	1st Hundred Hills 50km	49,89	×1