Boston Marathon logo
BOSTON MARATHON 2023

Jason Johs

Bib: 13481•M

IL

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Top 39%
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Top 43%
Division (M45-49)
#0 / 2252
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
23:58
Rank: #11561
Start → 5K
23:58 | 7:43/mi
10K· 6.21 mi
47:26
Rank: #11202 (+359)
5K → 10K
23:28 | 7:33/mi
15K· 9.32 mi
1:10:52
Rank: #10948 (+254)
10K → 15K
23:26 | 7:33/mi
20K· 12.43 mi
1:34:41
Rank: #10859 (+89)
15K → 20K
23:49 | 7:40/mi
Half· 13.11 mi
1:39:44
Rank: #10782 (+77)
20K → Half
5:03 | 7:24/mi
25K· 15.53 mi
1:58:38
Rank: #10795 (-13)
Half → 25K
18:54 | 7:48/mi
30K· 18.64 mi
2:23:39
Rank: #10829 (-34)
25K → 30K
25:01 | 8:03/mi
20M
2:34:39
Rank: #10777 (+52)
30K → 20M
11:00 | 8:06/mi
21M
2:43:16
Rank: #10810 (-33)
20M → 21M
8:37 | 8:37/mi
35K· 21.75 mi
2:49:02
Rank: #10759 (+51)
21M → 35K
5:46 | 7:42/mi
23M
2:59:06
Rank: #10688 (+71)
35K → 23M
10:04 | 8:02/mi
24M
3:06:53
Rank: #10641 (+47)
23M → 24M
7:47 | 7:47/mi
40K· 24.85 mi
3:13:42
Rank: #10572 (+69)
24M → 40K
6:49 | 7:58/mi
25.2M
3:16:38
Rank: #10539 (+33)
40K → 25.2M
2:56 | 8:30/mi
Finish· 26.22 mi
3:24:19
Rank: #10450 (+89)
25.2M → Finish
7:41 | 7:32/mi

The Course

Is this your race?

Claim it — unlock a deeper AI report on this race, free

A personalized Race Performance Report that goes beyond this page — emailed to you, built from your real splits.

Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:39:44
Pace7:36 /mi
2nd Half
Distance13.11 mi
Time1:44:35
Pace7:59 /mi
📊Positive Split: 4.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:52:1423:587:4323:58
7:43
-
10K
6.21 mi11:15:4247:267:3823:28
7:33
-0:10
15K
9.32 mi11:39:081:10:527:3623:26
7:33
0:00
20K
12.43 mi12:02:571:34:417:3723:49
7:40
+0:07
Half
13.11 mi12:08:001:39:447:365:03
7:24
-0:16
25K
15.53 mi12:26:541:58:387:3818:54
7:48
+0:24
30K
18.64 mi12:51:552:23:397:4225:01
8:03
+0:15
20M
20.00 mi13:02:552:34:397:4411:00
8:06
+0:03
21M
21.00 mi13:11:322:43:167:468:37
8:37
+0:31
35K
21.75 mi13:17:182:49:027:465:46
7:42
-0:55
23M
23.00 mi13:27:222:59:067:4710:04
8:02
+0:20
24M
24.00 mi13:35:093:06:537:477:47
7:47
-0:15
40K
24.85 mi13:41:583:13:427:486:49
7:58
+0:11
25.2M
25.20 mi13:44:543:16:387:482:56
8:30
+0:32
Finish
26.22 mi13:52:353:24:197:487:41
7:32
-0:58

Checkpoints & Pacing

📈Pace Line

Pace Progression

Track your pace changes throughout the race. Dot colors mark your quickest to easiest segments, relative to your own pace.

Fastest Pace

7:24 /mi

Average Pace

7:48 /mi

Slowest Pace

8:37 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:12:46

94% of race

Time at Steady Pace

11:33

6% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:48 /mi

Loading chart...
Faster pace (< avg)
Steady pace (≈ avg)
Slower pace (> avg)

🎨Heatmap

Pace Heatmap

Where you sped up and eased off relative to your own pace across the race. Colors are relative to your own range, not to other runners.

Loading...
0mi6.6mi13.1mi19.7mi26.2mi
Pace:
Faster
Steady
Slower

Click or hover over segments to see details

✨Sparklines

Checkpoint Splits with Pace Trends

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi10:52:1423:587:4323:58
7:43
#11561
10K
6.21 mi11:15:4247:267:3823:28
7:33
#11202
15K
9.32 mi11:39:081:10:527:3623:26
7:33
#10948
20K
12.43 mi12:02:571:34:417:3723:49
7:40
#10859
Half
13.11 mi12:08:001:39:447:365:03
7:24
#10782
25K
15.53 mi12:26:541:58:387:3818:54
7:48
#10795
30K
18.64 mi12:51:552:23:397:4225:01
8:03
#10829
20M
20.00 mi13:02:552:34:397:4411:00
8:06
#10777
21M
21.00 mi13:11:322:43:167:468:37
8:37
#10810
35K
21.75 mi13:17:182:49:027:465:46
7:42
#10759
23M
23.00 mi13:27:222:59:067:4710:04
8:02
#10688
24M
24.00 mi13:35:093:06:537:477:47
7:47
#10641
40K
24.85 mi13:41:583:13:427:486:49
7:58
#10572
25.2M
25.20 mi13:44:543:16:387:482:56
8:30
#10539
Finish
26.22 mi13:52:353:24:197:487:41
7:32
#10450
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi3.11 mi115618923892310519(Top 40%)8417(Top 55%)8417(Top 374%)
10K6.21 mi3.10 mi11202+3598748+1758748+17510895(Top 41%)8624(Top 57%)8624(Top 383%)
15K9.32 mi3.11 mi10948+2548627+1218627+12110519(Top 40%)8417(Top 55%)8417(Top 374%)
20K12.43 mi3.11 mi10859+898574+538574+5310624(Top 40%)8392(Top 55%)8392(Top 373%)
Half13.11 mi0.68 mi10782+778532+428532+429433(Top 35%)7783(Top 51%)7783(Top 346%)
25K15.53 mi2.42 mi10795-138531+18531+111042(Top 41%)8522(Top 56%)8522(Top 378%)
30K18.64 mi3.11 mi10829-348500+318500+3111299(Top 42%)8493(Top 56%)8493(Top 377%)
20M20.00 mi1.36 mi10777+528440+608440+6010961(Top 41%)8233(Top 54%)8233(Top 366%)
21M21.00 mi1.00 mi10810-338432+88432+811124(Top 42%)8173(Top 54%)8173(Top 363%)
35K21.75 mi0.75 mi10759+518387+458387+459968(Top 37%)7622(Top 50%)7622(Top 338%)
23M23.00 mi1.25 mi10688+718322+658322+6510024(Top 38%)7493(Top 49%)7493(Top 333%)
24M24.00 mi1.00 mi10641+478279+438279+439640(Top 36%)7219(Top 48%)7219(Top 321%)
40K24.85 mi0.85 mi10572+698206+738206+739853(Top 37%)7269(Top 48%)7269(Top 323%)
25.2M25.20 mi0.35 mi10539+338184+228184+229516(Top 36%)7042(Top 46%)7042(Top 313%)
Finish26.22 mi1.02 mi10450+898113+718113+718829(Top 33%)6657(Top 44%)6657(Top 296%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 40%
×21stories
+97ft-345ft

Overall

10519

Males

8417

M45-49

8417

5K→10K

3.1 - 6.2 mi

Top 41%
×5stories
+79ft-138ft

Overall

10895

Males

8624

M45-49

8624

10K→15K

6.2 - 9.3 mi

Top 40%
×3stories
+67ft-78ft

Overall

10519

Males

8417

M45-49

8417

15K→20K

9.3 - 12.4 mi

Top 40%
×5stories
+106ft-86ft

Overall

10624

Males

8392

M45-49

8392

20K→Half

12.4 - 13.1 mi

Top 35%
×2stories
+19ft-37ft

Overall

9433

Males

7783

M45-49

7783

Half→25K

13.1 - 15.5 mi

Top 41%
×4stories
+66ft-88ft

Overall

11042

Males

8522

M45-49

8522

25K→30K

15.5 - 18.6 mi

Top 42%
×9stories
+181ft-148ft

Overall

11299

Males

8493

M45-49

8493

30K→20M

18.6 - 20.0 mi

Top 41%
×5stories
+64ft-50ft

Overall

10961

Males

8233

M45-49

8233

20M→21M

20.0 - 21.0 mi

Top 42%
×8stories
+106ft-24ft

Overall

11124

Males

8173

M45-49

8173

21M→35K

21.0 - 21.8 mi

Top 37%
×7stories
+17ft-86ft

Overall

9968

Males

7622

M45-49

7622

35K→23M

21.8 - 23.0 mi

Top 38%
×5stories
+23ft-63ft

Overall

10024

Males

7493

M45-49

7493

23M→24M

23.0 - 24.0 mi

Top 36%
×6stories
+12ft-82ft

Overall

9640

Males

7219

M45-49

7219

24M→40K

24.0 - 24.9 mi

Top 37%
×1story
+6ft-20ft

Overall

9853

Males

7269

M45-49

7269

40K→25.2M

24.9 - 25.2 mi

Top 36%
×1story
+13ft-16ft

Overall

9516

Males

7042

M45-49

7042

25.2M→Finish

25.2 - 26.2 mi

Top 33%
×2stories
+22ft-21ft

Overall

8829

Males

6657

M45-49

6657

Passing Analysis

Category:
Athletes Passed
2148*
Passed By
1037
Net Change
+1111
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#11561
5K → 10K509150+359#11561#11202
10K → 15K32975+254#11202#10948
15K → 20K199110+89#10948#10859
20K → Half847+77#10859#10782
Half → 25K125138-13#10782#10795
25K → 30K180214-34#10795#10829
30K → 20M103*51+52#10829#10777
20M → 21M6194-33#10777#10810
21M → 35K7120+51#10810#10759
35K → 23M12453+71#10759#10688
23M → 24M9447+47#10688#10641
24M → 40K9829+69#10641#10572
40K → 25.2M4714+33#10572#10539
25.2M → Finish12435+89#10539#10450
TOTALS2148*1037+1111

* Includes athletes who did not complete a segment (DNF/DNQ).

📊

Passing Visuals

Category:
Loading...

🔥Passing Intensity

Loading...

🔄Passing Circle

Loading...

🌊Position Flow

Loading...

🏃Race Lanes

Loading...

Upload your GPX file

Supports Garmin, Apple Watch, Polar, Suunto, COROS, Strava, and other apps

.gpx files up to 10MB

Export Track Data

Download your race performance as a GPX or TCX file to import into Strava, Garmin Connect, or other fitness apps.

Questions or issues regarding timing data?

If you notice any discrepancies in your timing data or have questions about your results, our support team can help.

Contact Race Support
Share Feedback

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing