Boston Marathon logo
BOSTON MARATHON 2023

Jonathan Kang

Bib: 29765•M

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

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
8:39/mi
26:53
↑ 97↓ 3451.5%
10K· 6.21 mi
8:16/mi
52:35
↑ 79↓ 1380.4%
15K· 9.32 mi
8:21/mi
1:18:32
↑ 67↓ 78
20K· 12.43 mi
8:25/mi
1:44:40
↑ 106↓ 860.1%
Half· 13.11 mi
8:20/mi
1:50:21
↑ 19↓ 370.5%
25K· 15.53 mi
8:33/mi
2:11:06
↑ 66↓ 880.2%
30K· 18.64 mi
8:42/mi
2:38:07
↑ 181↓ 1480.2%
20M
8:41/mi
2:49:55
↑ 64↓ 500.2%
21M
9:12/mi
2:59:07
↑ 106↓ 241.6%
35K· 21.75 mi
8:35/mi
3:05:32
↑ 17↓ 861.7%
23M
8:45/mi
3:16:29
↑ 23↓ 630.6%
24M
8:35/mi
3:25:04
↓ 821.3%
40K· 24.85 mi
8:44/mi
3:32:32
↓ 200.3%
25.2M
9:20/mi
3:35:45
↑ 13↓ 160.2%
Finish· 26.22 mi
8:17/mi
3:44:11
↑ 22↓ 21

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
Time1:50:21
Pace8:25 /mi
2nd Half
Distance13.11 mi
Time1:53:50
Pace8:41 /mi
📊Positive Split: 3.2% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:49:2626:538:3926:53
8:39
-
10K
6.21 mi12:15:0852:358:2825:42
8:16
-0:23
15K
9.32 mi12:41:051:18:328:2625:57
8:21
+0:05
20K
12.43 mi13:07:131:44:408:2526:08
8:25
+0:04
Half
13.11 mi13:12:541:50:218:255:41
8:20
-0:05
25K
15.53 mi13:33:392:11:068:2620:45
8:33
+0:13
30K
18.64 mi14:00:402:38:078:2927:01
8:42
+0:09
20M
20.00 mi14:12:282:49:558:3011:48
8:41
-0:01
21M
21.00 mi14:21:402:59:078:329:12
9:12
+0:31
35K
21.75 mi14:28:053:05:328:326:25
8:35
-0:37
23M
23.00 mi14:39:023:16:298:3310:57
8:45
+0:10
24M
24.00 mi14:47:373:25:048:338:35
8:35
-0:10
40K
24.85 mi14:55:053:32:328:337:28
8:44
+0:09
25.2M
25.20 mi14:58:183:35:458:343:13
9:20
+0:36
Finish
26.22 mi15:06:443:44:118:338:26
8:17
-1:03

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

8:16 /mi

Average Pace

8:33 /mi

Slowest Pace

9:20 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:31:46

94% of race

Time at Steady Pace

12:25

6% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 8:33 /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 mi11:49:2626:538:3926:53
8:39
#18571
10K
6.21 mi12:15:0852:358:2825:42
8:16
#17649
15K
9.32 mi12:41:051:18:328:2625:57
8:21
#17361
20K
12.43 mi13:07:131:44:408:2526:08
8:25
#17075
Half
13.11 mi13:12:541:50:218:255:41
8:20
#17062
25K
15.53 mi13:33:392:11:068:2620:45
8:33
#16973
30K
18.64 mi14:00:402:38:078:2927:01
8:42
#16661
20M
20.00 mi14:12:282:49:558:3011:48
8:41
#16504
21M
21.00 mi14:21:402:59:078:329:12
9:12
#16371
35K
21.75 mi14:28:053:05:328:326:25
8:35
#16336
23M
23.00 mi14:39:023:16:298:3310:57
8:45
#16216
24M
24.00 mi14:47:373:25:048:338:35
8:35
#16145
40K
24.85 mi14:55:053:32:328:337:28
8:44
#16084
25.2M
25.20 mi14:58:183:35:458:343:13
9:20
#16052
Finish
26.22 mi15:06:443:44:118:338:26
8:17
#15977
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi3.11 mi18571116321163216853(Top 63%)11006(Top 73%)11006(Top 489%)
10K6.21 mi3.10 mi17649+92211312+32011312+32016723(Top 63%)10998(Top 72%)10998(Top 488%)
15K9.32 mi3.11 mi17361+28811208+10411208+10416853(Top 63%)11006(Top 73%)11006(Top 489%)
20K12.43 mi3.11 mi17075+28611077+13111077+13116307(Top 61%)10753(Top 71%)10753(Top 477%)
Half13.11 mi0.68 mi17062+1311073+411073+416614(Top 62%)10916(Top 72%)10916(Top 485%)
25K15.53 mi2.42 mi16973+8911025+4811025+4816528(Top 62%)10767(Top 71%)10767(Top 478%)
30K18.64 mi3.11 mi16661+31210857+16810857+16815483(Top 58%)10252(Top 68%)10252(Top 455%)
20M20.00 mi1.36 mi16504+15710781+7610781+7614743(Top 55%)9878(Top 65%)9878(Top 439%)
21M21.00 mi1.00 mi16371+13310714+6710714+6714469(Top 54%)9709(Top 64%)9709(Top 431%)
35K21.75 mi0.75 mi16336+3510693+2110693+2115704(Top 59%)10159(Top 67%)10159(Top 451%)
23M23.00 mi1.25 mi16216+12010629+6410629+6414658(Top 55%)9660(Top 64%)9660(Top 429%)
24M24.00 mi1.00 mi16145+7110584+4510584+4514953(Top 56%)9731(Top 64%)9731(Top 432%)
40K24.85 mi0.85 mi16084+6110543+4110543+4114697(Top 55%)9547(Top 63%)9547(Top 424%)
25.2M25.20 mi0.35 mi16052+3210523+2010523+2014281(Top 54%)9374(Top 62%)9374(Top 416%)
Finish26.22 mi1.02 mi15977+7510481+4210481+4213938(Top 52%)9225(Top 61%)9225(Top 410%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 63%
×21story building
+97ft-345ft

Overall

16853

Males

11006

M45-49

11006

5K→10K

3.1 - 6.2 mi

Top 63%
×5story building
+79ft-138ft

Overall

16723

Males

10998

M45-49

10998

10K→15K

6.2 - 9.3 mi

Top 63%
×3story building
+67ft-78ft

Overall

16853

Males

11006

M45-49

11006

15K→20K

9.3 - 12.4 mi

Top 61%
×5story building
+106ft-86ft

Overall

16307

Males

10753

M45-49

10753

20K→Half

12.4 - 13.1 mi

Top 62%
×2story building
+19ft-37ft

Overall

16614

Males

10916

M45-49

10916

Half→25K

13.1 - 15.5 mi

Top 62%
×4story building
+66ft-88ft

Overall

16528

Males

10767

M45-49

10767

25K→30K

15.5 - 18.6 mi

Top 58%
×9story building
+181ft-148ft

Overall

15483

Males

10252

M45-49

10252

30K→20M

18.6 - 20.0 mi

Top 55%
×5story building
+64ft-50ft

Overall

14743

Males

9878

M45-49

9878

20M→21M

20.0 - 21.0 mi

Top 54%
×8story building
+106ft-24ft

Overall

14469

Males

9709

M45-49

9709

21M→35K

21.0 - 21.8 mi

Top 59%
×7story building
+17ft-86ft

Overall

15704

Males

10159

M45-49

10159

35K→23M

21.8 - 23.0 mi

Top 55%
×5story building
+23ft-63ft

Overall

14658

Males

9660

M45-49

9660

23M→24M

23.0 - 24.0 mi

Top 56%
×6story building
+12ft-82ft

Overall

14953

Males

9731

M45-49

9731

24M→40K

24.0 - 24.9 mi

Top 55%
×1story
+6ft-20ft

Overall

14697

Males

9547

M45-49

9547

40K→25.2M

24.9 - 25.2 mi

Top 54%
×1story
+13ft-16ft

Overall

14281

Males

9374

M45-49

9374

25.2M→Finish

25.2 - 26.2 mi

Top 52%
×2story building
+22ft-21ft

Overall

13938

Males

9225

M45-49

9225

Passing Analysis

Category:
Athletes Passed
3131
Passed By
537
Net Change
+2594
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#18571
5K → 10K102098+922#18571#17649
10K → 15K37385+288#17649#17361
15K → 20K33347+286#17361#17075
20K → Half3522+13#17075#17062
Half → 25K15465+89#17062#16973
25K → 30K34331+312#16973#16661
30K → 20M18023+157#16661#16504
20M → 21M15118+133#16504#16371
21M → 35K6429+35#16371#16336
35K → 23M14727+120#16336#16216
23M → 24M9726+71#16216#16145
24M → 40K9130+61#16145#16084
40K → 25.2M397+32#16084#16052
25.2M → Finish10429+75#16052#15977
TOTALS3131537+2594
📊

Passing Visuals

Category:
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

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing