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Jonathan Ackermann

Helios Project

W–L
8–10
Won and lost rating-eligible matches in the past 12 months.
Gi
1,381
Rating based on Gi matches in the past 12 months.
No-Gi
1,219
Rating based on No-Gi matches in the past 12 months.
Current form
5–5
Results from the ten most recent rating-eligible matches.
Opponents
9
Unique opponents faced in rating-eligible matches in the past 12 months.

Tournament history

Events

14
Events
Date Event Result Format Division
GERMAN NATIONAL OPEN CHAMPIONSHIP 2026 Germany · Gi · U16 · orange · ≤62 kg ; No-Gi · U16 · orange · ≤62 kg 3–1 W–L: Win / Loss GiNo-Gi
  • Boys Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
  • Boys No-Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
NAGA Germany Grappling Championship Germany · Gi · 14–15 yo · 65–69.9 kg 0–2 W–L: Win / Loss Gi
  • Teens Gi (Male) / Intermediate / 65 - 69.9 / 14-15 years
International Veluwe Open Jiu Jitsu Championship 2026 GI & NO-GI the Netherlands · Gi · 13–15 yo · yellow · ≤65 kg ; No-Gi · 13–15 yo · yellow/orange · ≤65 kg 2–2 W–L: Win / Loss GiNo-Gi
  • Kids No-GI / 13 - 15 years boys / Yellow & Orange -65 kg
  • Kids GI / 13 - 15 years / Yellow / -65 kg
COLOGNE WINTER OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP Germany · Gi · U16 · orange · ≤62 kg ; No-Gi · U16 · orange · ≤62 kg 2–3 W–L: Win / Loss GiNo-Gi
  • Boys Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
  • Boys No-Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
DÜSSELDORF FALL OPEN CHAMPIONSHIP 2025 I EUROPEAN CUP Germany · Gi · U16 · yellow · ≤62 kg ; No-Gi · U16 · yellow · ≤62 kg 1–2 W–L: Win / Loss GiNo-Gi
  • Boys Gi (under 16 y.o.) / Yellow / 14-15 years / -62 kg
  • Boys No-Gi (under 16 y.o.) / Yellow / 14-15 years / -62 kg
GERMAN NATIONAL KIDS OPEN CHAMPIONSHIP 2025 Germany · Gi · U16 · yellow · ≤62 kg ; No-Gi · U16 · orange · ≤67 kg 1–3 W–L: Win / Loss GiNo-Gi
  • Boys No-Gi (under 16 y.o.) / Orange / 14-15 years / -67 kg
  • Boys Gi (under 16 y.o.) / Yellow / 14-15 years / -62 kg
Nijmegen Open BJJ 2025 the Netherlands · Gi · 13–15 yo · yellow · ≤55/60 kg 2–1 W–L: Win / Loss Gi
  • Kids / 13 - 15 years boys / Yellow / -55 & -60 kg
FRANKFURT WINTER OPEN CHAMPIONSHIP 2025 I EUROPEAN CUP Germany · Gi · U16 · yellow · ≤56 kg ; No-Gi · U16 · orange · ≤62 kg 0–3 W–L: Win / Loss GiNo-Gi
  • Boys Gi (under 16 y.o.) / Yellow / 14-15 years / -56 kg
  • Boys No-Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
Inclusive Nikolaus KIDS&TEENS BJJ Championship GI + NO GI Germany · Gi · 14–15 yo · grey/yellow · 46.01–56 kg ; No-Gi · 14–15 yo · white · 50.01–67 kg 3–0 W–L: Win / Loss GiNo-Gi
  • Teen Boys No-Gi / Teen II (14-15yrs) / White / 50,01 kg - 67,00 kg
  • Teen Boys Gi / Teen II (14-15yrs) / Grey / Yellow / 46,01 kg - 56,00 kg
Lion Cub Jiu Jitsu Competition 3 the Netherlands · Gi · yellow · ≤50/55 kg 2–2 W–L: Win / Loss Gi
  • Boys / 13 - 15 Boys / Yellow / -50 & -55 kg
COLOGNE FALL OPEN CHAMPIONSHIP 2024 | European Cup Germany · Gi · U16 · orange · ≤55 kg 2–2 W–L: Win / Loss Gi
  • Boys Gi (under 16 y.o.) / Orange / 12-13 years / -55 kg
Nijmegen Open BJJ 2024 the Netherlands · Gi · 13–15 yo · grey · ≤50/55 kg 0–2 W–L: Win / Loss Gi
  • Kids / 13 - 15 years boys / Grey / -50 & -55 kg
COLOGNE OPEN CHAMPIONSHIP I European Cup Germany · Gi · U16 · grey · ≤50 kg 0–2 W–L: Win / Loss Gi
  • Boys Gi (under 16 y.o.) / Grey / 12-13 years / -50 kg
EUROPEAN GROUND FIGHTING CHAMPIONSHIP 4 Gi and NoGi Germany · Gi · 13 yo · grey · ≤44.5 kg 2–0 W–L: Win / Loss Gi
  • Boys Gi / Grey / Teen I (13yrs) / -44,50 kg

Calculation details

Rating breakdown for the past 12 months

See the published month-end rating and the rating-eligible matches added in each month. Open a month for details.

August 2026 No new matches Change +4 Rating 1,374

Rating-period composition

Rating matches
18 0
Record
8–10 Previous month 8–10
Opponents
9 0
Events
5 0

No matches were added or left the period. The change comes from the monthly revaluation of opponents across the full network.

July 2026 No new matches Change -2 Rating 1,370

Rating-period composition

Rating matches
18 0
Record
8–10 Previous month 8–10
Opponents
9 0
Events
5 0

No matches were added or left the period. The change comes from the monthly revaluation of opponents across the full network.

June 2026 4 new matches · 4 left period Change +53 Rating 1,372

Rating-period composition

Rating matches
18 0
Record
8–10 Previous month 6–12
Opponents
9 -1
Events
5 0

4 older matches left the 12-month period: 1 won and 3 lost. The rating is then recalculated across the full network, so the monthly change is not a sum of separate deductions.

New rating matches

This is a current what-if estimate: roughly how much the current rating changes when this match is omitted. These values cannot be added and therefore do not together explain the monthly change.
Win
June 27, 2026 João Feitosa
GERMAN NATIONAL OPEN CHAMPIONSHIP 2026 Boys No-Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
Method Decision 04:00 0–0
Marginal influence +12
Loss
June 27, 2026 Peter Müller
GERMAN NATIONAL OPEN CHAMPIONSHIP 2026 Boys No-Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
Method Submission 03:02 0–4
Marginal influence -8
Win
June 27, 2026 Peter Müller
GERMAN NATIONAL OPEN CHAMPIONSHIP 2026 Boys Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
Method Submission 02:26 0–6
Marginal influence +16
Win
June 27, 2026 João Feitosa
GERMAN NATIONAL OPEN CHAMPIONSHIP 2026 Boys Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
Method Points 04:00 2–0
Marginal influence +16
May 2026 2 new matches · 3 left period Change -21 Rating 1,319

Rating-period composition

Rating matches
18 -1
Record
6–12 Previous month 8–11
Opponents
10 0
Events
5 0

3 older matches left the 12-month period: 2 won and 1 lost. The rating is then recalculated across the full network, so the monthly change is not a sum of separate deductions.

New rating matches

This is a current what-if estimate: roughly how much the current rating changes when this match is omitted. These values cannot be added and therefore do not together explain the monthly change.
Loss
May 23, 2026 Artem Petrenko
NAGA Germany Grappling Championship Teens Gi (Male) / Intermediate / 65 - 69.9 / 14-15 years
Method Submission 02:29 0–13
Marginal influence -4
Loss
May 23, 2026 Artem Petrenko
NAGA Germany Grappling Championship Teens Gi (Male) / Intermediate / 65 - 69.9 / 14-15 years
Method Points 03:00 0–6
Marginal influence -4
April 2026 No new matches Change +4 Rating 1,340

Rating-period composition

Rating matches
19 0
Record
8–11 Previous month 8–11
Opponents
10 0
Events
5 0

No matches were added or left the period. The change comes from the monthly revaluation of opponents across the full network.

March 2026 4 new matches Change +9 Rating 1,336

Rating-period composition

Rating matches
19 +4
Record
8–11 Previous month 6–9
Opponents
10 +2
Events
5 +1

New rating matches

This is a current what-if estimate: roughly how much the current rating changes when this match is omitted. These values cannot be added and therefore do not together explain the monthly change.
Loss
March 28, 2026 Ricardo Veenstra
International Veluwe Open Jiu Jitsu Championship 2026 GI & NO-GI Kids No-GI / 13 - 15 years boys / Yellow & Orange -65 kg
Method Points 04:00 0–3
Marginal influence -11
Loss
March 28, 2026 Ricardo Veenstra
International Veluwe Open Jiu Jitsu Championship 2026 GI & NO-GI Kids No-GI / 13 - 15 years boys / Yellow & Orange -65 kg
Method Submission 00:46 0–3
Marginal influence -11
Win
March 28, 2026 Kilyan Oener
International Veluwe Open Jiu Jitsu Championship 2026 GI & NO-GI Kids GI / 13 - 15 years / Yellow / -65 kg
Method Points 04:00 2–0
Marginal influence +10
Win
March 28, 2026 Camelia Bouzid
International Veluwe Open Jiu Jitsu Championship 2026 GI & NO-GI Kids GI / 13 - 15 years / Yellow / -65 kg
Method Submission 03:28 0–2
Marginal influence +11
February 2026 5 new matches · 3 left period Change +64 Rating 1,327

Rating-period composition

Rating matches
15 +2
Record
6–9 Previous month 4–9
Opponents
8 0
Events
4 0

3 older matches left the 12-month period: 0 won and 3 lost. The rating is then recalculated across the full network, so the monthly change is not a sum of separate deductions.

New rating matches

This is a current what-if estimate: roughly how much the current rating changes when this match is omitted. These values cannot be added and therefore do not together explain the monthly change.
Loss
February 7, 2026 Felix Geling
COLOGNE WINTER OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP Boys No-Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
Method Submission 00:43 0–0
Marginal influence -9
Loss
February 7, 2026 Peter Müller
COLOGNE WINTER OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP Boys No-Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
Method Submission 02:22 0–4
Marginal influence -7
Win
February 7, 2026 Teo Gerhardy-Salas
COLOGNE WINTER OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP Boys No-Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
Method Submission 02:01 6–0
Marginal influence +7
Win
February 7, 2026 Felix Geling
COLOGNE WINTER OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP Boys Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
Method Submission 01:17 0–0
Marginal influence +18
Loss
February 7, 2026 Peter Müller
COLOGNE WINTER OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP Boys Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
Method Submission 03:06 0–7
Marginal influence -7
January 2026 No new matches Change -1 Rating 1,263

Rating-period composition

Rating matches
13 0
Record
4–9 Previous month 4–9
Opponents
8 0
Events
4 0

No matches were added or left the period. The change comes from the monthly revaluation of opponents across the full network.

December 2025 No new matches · 3 left period Change -60 Rating 1,264

Rating-period composition

Rating matches
13 -3
Record
4–9 Previous month 7–9
Opponents
8 -3
Events
4 -1

3 older matches left the 12-month period: 3 won and 0 lost. The rating is then recalculated across the full network, so the monthly change is not a sum of separate deductions.

November 2025 No new matches Change -4 Rating 1,324

Rating-period composition

Rating matches
16 0
Record
7–9 Previous month 7–9
Opponents
11 0
Events
5 0

No matches were added or left the period. The change comes from the monthly revaluation of opponents across the full network.

October 2025 No new matches · 7 left period Change -22 Rating 1,328

Rating-period composition

Rating matches
16 -7
Record
7–9 Previous month 10–13
Opponents
11 -7
Events
5 -2

7 older matches left the 12-month period: 3 won and 4 lost. The rating is then recalculated across the full network, so the monthly change is not a sum of separate deductions.

September 2025 3 new matches Change +4 Rating 1,350

Rating-period composition

Rating matches
23 +3
Record
10–13 Previous month 9–11
Opponents
18 +2
Events
7 +1

New rating matches

This is a current what-if estimate: roughly how much the current rating changes when this match is omitted. These values cannot be added and therefore do not together explain the monthly change.
Loss
September 13, 2025 Danila Ruslan Bergheim
DÜSSELDORF FALL OPEN CHAMPIONSHIP 2025 I EUROPEAN CUP Boys No-Gi (under 16 y.o.) / Yellow / 14-15 years / -62 kg
Method Submission 00:48 0–7
Marginal influence -18
Loss
September 13, 2025 Danila Ruslan Bergheim
DÜSSELDORF FALL OPEN CHAMPIONSHIP 2025 I EUROPEAN CUP Boys Gi (under 16 y.o.) / Yellow / 14-15 years / -62 kg
Method Submission 01:02 0–3
Marginal influence -8
Win
September 13, 2025 Kilyan Oener
DÜSSELDORF FALL OPEN CHAMPIONSHIP 2025 I EUROPEAN CUP Boys Gi (under 16 y.o.) / Yellow / 14-15 years / -62 kg
Method Points 04:00 9–2
Marginal influence +10
Relevant matches
12.6
Official ranking percentile
-
Performance
5.2 pp above expectation

12.6 weighted matches against 9 different opponents across 5 events

Weighted win rate
46.5%
Expected win rate
41.3%
Average opponent rating
1,399
Repeated-opponent share
50.0%
Network connectivity
87.6%

Classification evidence

Why U18?

Within the published period from 2025-09-01 through 2026-08-31, only competition ages recorded at events in the calculation year determine this outcome, with at most one vote per event. Without such an age, the most recent unambiguous earlier competition age is projected to the calculation year; bracket evidence is the final fallback. The newest evidence breaks a tie.

Evidence outcome

  • U18 4 event votes Selected outcome

Registrations and outcomes

GERMAN NATIONAL OPEN CHAMPIONSHIP 2026
U18 · Counts
Boys No-Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
  • Competition age 16
  • Registered age: u16
  • Source category: u16
Boys Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
  • Competition age 16
  • Registered age: u16
  • Source category: u16
NAGA Germany Grappling Championship
U18 · Counts
Teens Gi (Male) / Intermediate / 65 - 69.9 / 14-15 years
  • Competition age 16
  • Registered age: u16
  • Source category: u16
International Veluwe Open Jiu Jitsu Championship 2026 GI & NO-GI
U18 · Counts
1 Supporter ticket
Kids No-GI / 13 - 15 years boys / Yellow & Orange -65 kg
  • Competition age 16
  • Registered age: u16
  • Source category: u16
Kids GI / 13 - 15 years / Yellow / -65 kg
  • Competition age 16
  • Registered age: u16
  • Source category: u16
COLOGNE WINTER OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP
U18 · Counts
Boys No-Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
  • Competition age 16
  • Registered age: u16
  • Source category: u16
Boys Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
  • Competition age 16
  • Registered age: u16
  • Source category: u16
DÜSSELDORF FALL OPEN CHAMPIONSHIP 2025 I EUROPEAN CUP
Does not count
Boys No-Gi (under 16 y.o.) / Yellow / 14-15 years / -62 kg
  • Competition age 15
  • Registered age: u16
  • Source category: u16
Boys Gi (under 16 y.o.) / Yellow / 14-15 years / -62 kg
  • Competition age 15
  • Registered age: u16
  • Source category: u16

Classification evidence

Why ≤ 62 kg?

This outcome uses at most one unambiguous upper weight limit per completed ranking event from 2025-09-01 through 2026-08-31. Only the three most recent eligible events are considered, and the lightest verified upper limit is selected. A higher division is not treated as measured body weight.

Evidence outcome

  • ≤ 62 kg 1 competition event Selected outcome
  • ≤ 65 kg 1 competition event
  • ≤ 70 kg 1 competition event

Registrations and outcomes

GERMAN NATIONAL OPEN CHAMPIONSHIP 2026
≤ 62 kg · Counts as a competition event
Boys No-Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
  • Registered weight class: -62 kg
  • Source competition limit: -62 kg

2 matches in the rating period

GERMAN NATIONAL OPEN CHAMPIONSHIP 2026
≤ 62 kg · Counts as a competition event
Boys Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
  • Registered weight class: -62 kg
  • Source competition limit: -62 kg

2 matches in the rating period

NAGA Germany Grappling Championship
≤ 70 kg · Counts as a competition event
Teens Gi (Male) / Intermediate / 65 - 69.9 / 14-15 years
  • Registered weight class: 65 - 69.9
  • Source competition limit: 65 - 69.9

2 matches in the rating period

International Veluwe Open Jiu Jitsu Championship 2026 GI & NO-GI
Does not count
1 Supporter ticket

No matches in the rating period · no valid weight evidence

International Veluwe Open Jiu Jitsu Championship 2026 GI & NO-GI
≤ 65 kg · Counts as a competition event
Kids No-GI / 13 - 15 years boys / Yellow & Orange -65 kg
  • Registered weight class: -65 kg
  • Source competition limit: -65 kg

2 matches in the rating period

International Veluwe Open Jiu Jitsu Championship 2026 GI & NO-GI
≤ 65 kg · Counts as a competition event
Kids GI / 13 - 15 years / Yellow / -65 kg
  • Registered weight class: -65 kg
  • Source competition limit: -65 kg

2 matches in the rating period

COLOGNE WINTER OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP
≤ 62 kg · Does not count
Boys No-Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
  • Registered weight class: -62 kg
  • Source competition limit: -62 kg

3 matches in the rating period · outside the three most recent unambiguous events

COLOGNE WINTER OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP
≤ 62 kg · Does not count
Boys Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
  • Registered weight class: -62 kg
  • Source competition limit: -62 kg

2 matches in the rating period · outside the three most recent unambiguous events

DÜSSELDORF FALL OPEN CHAMPIONSHIP 2025 I EUROPEAN CUP
≤ 62 kg · Does not count
Boys No-Gi (under 16 y.o.) / Yellow / 14-15 years / -62 kg
  • Registered weight class: -62 kg
  • Source competition limit: -62 kg

1 match in the rating period · outside the three most recent unambiguous events

DÜSSELDORF FALL OPEN CHAMPIONSHIP 2025 I EUROPEAN CUP
≤ 62 kg · Does not count
Boys Gi (under 16 y.o.) / Yellow / 14-15 years / -62 kg
  • Registered weight class: -62 kg
  • Source competition limit: -62 kg

2 matches in the rating period · outside the three most recent unambiguous events

Classification evidence

Why Orange?

This outcome uses the belt category of every rating-eligible match from 2025-09-01 through 2026-08-31. The most-fought category is selected; the newest evidence breaks a tie.

Evidence outcome

  • orange 11 matches in the rating period Selected outcome
  • yellow 5 matches in the rating period

Registrations and outcomes

GERMAN NATIONAL OPEN CHAMPIONSHIP 2026
orange · Counts as a match
Boys No-Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
  • Source belt category: orange

2 matches in the rating period

GERMAN NATIONAL OPEN CHAMPIONSHIP 2026
orange · Counts as a match
Boys Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
  • Source belt category: orange

2 matches in the rating period

International Veluwe Open Jiu Jitsu Championship 2026 GI & NO-GI
orange · Counts as a match
Kids No-GI / 13 - 15 years boys / Yellow & Orange -65 kg
  • Source belt category: orange

2 matches in the rating period

International Veluwe Open Jiu Jitsu Championship 2026 GI & NO-GI
yellow · Counts as a match
Kids GI / 13 - 15 years / Yellow / -65 kg
  • Source belt category: yellow

2 matches in the rating period

COLOGNE WINTER OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP
orange · Counts as a match
Boys No-Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
  • Source belt category: orange

3 matches in the rating period

COLOGNE WINTER OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP
orange · Counts as a match
Boys Gi (under 16 y.o.) / Orange / 14-15 years / -62 kg
  • Source belt category: orange

2 matches in the rating period

DÜSSELDORF FALL OPEN CHAMPIONSHIP 2025 I EUROPEAN CUP
yellow · Counts as a match
Boys No-Gi (under 16 y.o.) / Yellow / 14-15 years / -62 kg
  • Source belt category: yellow

1 match in the rating period

DÜSSELDORF FALL OPEN CHAMPIONSHIP 2025 I EUROPEAN CUP
yellow · Counts as a match
Boys Gi (under 16 y.o.) / Yellow / 14-15 years / -62 kg
  • Source belt category: yellow

2 matches in the rating period