Boston Marathon logo
BOSTON MARATHON 2025

David Jacobson

Bib: 4311•M

OR

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 28404
Top 11%
Gender (Male)
#0 / 16105
Top 18%
Division (M18-39)
#0 / 5642
Top 40%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
19:43
Rank: #2727
Start → 5K
19:43 | 6:21/mi
10K· 6.21 mi
39:24
Rank: #2675 (+52)
5K → 10K
19:41 | 6:20/mi
15K· 9.32 mi
59:04
Rank: #2620 (+55)
10K → 15K
19:40 | 6:20/mi
20K· 12.43 mi
1:18:56
Rank: #2557 (+63)
15K → 20K
19:52 | 6:24/mi
Half· 13.11 mi
1:23:15
Rank: #2561 (-4)
20K → Half
4:19 | 6:20/mi
25K· 15.53 mi
1:39:02
Rank: #2598 (-37)
Half → 25K
15:47 | 6:31/mi
30K· 18.64 mi
1:59:54
Rank: #2623 (-25)
25K → 30K
20:52 | 6:43/mi
20M
2:09:05
Rank: #2600 (+23)
30K → 20M
9:11 | 6:45/mi
21M
2:16:08
Rank: #2566 (+34)
20M → 21M
7:03 | 7:03/mi
35K· 21.75 mi
2:21:16
Rank: #2606 (-40)
21M → 35K
5:08 | 6:52/mi
23M
2:30:20
Rank: #2720 (-114)
35K → 23M
9:04 | 7:14/mi
24M
2:37:36
Rank: #2805 (-85)
23M → 24M
7:16 | 7:16/mi
40K· 24.85 mi
2:44:00
Rank: #2905 (-100)
24M → 40K
6:24 | 7:29/mi
25.2M
2:46:47
Rank: #2925 (-20)
40K → 25.2M
2:47 | 8:04/mi
Finish· 26.22 mi
2:54:08
Rank: #3025 (-100)
25.2M → Finish
7:21 | 7:13/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
Time1:23:15
Pace6:21 /mi
2nd Half
Distance13.11 mi
Time1:30:53
Pace6:56 /mi
📊Positive Split: 9.2% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:22:3519:436:2119:43
6:21
-
10K
6.21 mi10:42:1639:246:2019:41
6:20
-0:01
15K
9.32 mi11:01:5659:046:2019:40
6:20
0:00
20K
12.43 mi11:21:481:18:566:2119:52
6:24
+0:04
Half
13.11 mi11:26:071:23:156:214:19
6:20
-0:04
25K
15.53 mi11:41:541:39:026:2315:47
6:31
+0:11
30K
18.64 mi12:02:461:59:546:2620:52
6:43
+0:12
20M
20.00 mi12:11:572:09:056:279:11
6:45
+0:02
21M
21.00 mi12:19:002:16:086:297:03
7:03
+0:18
35K
21.75 mi12:24:082:21:166:305:08
6:52
-0:11
23M
23.00 mi12:33:122:30:206:329:04
7:14
+0:22
24M
24.00 mi12:40:282:37:366:347:16
7:16
+0:02
40K
24.85 mi12:46:522:44:006:366:24
7:29
+0:13
25.2M
25.20 mi12:49:392:46:476:372:47
8:04
+0:35
Finish
26.22 mi12:57:002:54:086:397:21
7:13
-0:51

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

6:20 /mi

Average Pace

6:39 /mi

Slowest Pace

8:04 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:23:15

48% of race

Time at Steady Pace

50:58

29% of race

Time at Slower Pace

39:55

23% of race

Average Pace: 6:38 /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 mi10:22:3519:436:2119:43
6:21
#2727
10K
6.21 mi10:42:1639:246:2019:41
6:20
#2675
15K
9.32 mi11:01:5659:046:2019:40
6:20
#2620
20K
12.43 mi11:21:481:18:566:2119:52
6:24
#2557
Half
13.11 mi11:26:071:23:156:214:19
6:20
#2561
25K
15.53 mi11:41:541:39:026:2315:47
6:31
#2598
30K
18.64 mi12:02:461:59:546:2620:52
6:43
#2623
20M
20.00 mi12:11:572:09:056:279:11
6:45
#2600
21M
21.00 mi12:19:002:16:086:297:03
7:03
#2566
35K
21.75 mi12:24:082:21:166:305:08
6:52
#2606
23M
23.00 mi12:33:122:30:206:329:04
7:14
#2720
24M
24.00 mi12:40:282:37:366:347:16
7:16
#2805
40K
24.85 mi12:46:522:44:006:366:24
7:29
#2905
25.2M
25.20 mi12:49:392:46:476:372:47
8:04
#2925
Finish
26.22 mi12:57:002:54:086:397:21
7:13
#3025
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi2727260026002520(Top 9%)2405(Top 15%)2405(Top 43%)
10K6.21 mi3.10 mi2675+522546+542546+542643(Top 9%)2520(Top 16%)2520(Top 45%)
15K9.32 mi3.11 mi2620+552498+482498+482520(Top 9%)2405(Top 15%)2405(Top 43%)
20K12.43 mi3.11 mi2557+632439+592439+592488(Top 9%)2373(Top 15%)2373(Top 42%)
Half13.11 mi0.68 mi2561-42447-82447-82642(Top 9%)2525(Top 16%)2525(Top 45%)
25K15.53 mi2.42 mi2598-372480-332480-332933(Top 10%)2789(Top 17%)2789(Top 49%)
30K18.64 mi3.11 mi2623-252502-222502-222962(Top 10%)2789(Top 17%)2789(Top 49%)
20M20.00 mi1.36 mi2600+232482+202482+202713(Top 10%)2542(Top 16%)2542(Top 45%)
21M21.00 mi1.00 mi2566+342446+362446+362441(Top 9%)2277(Top 14%)2277(Top 40%)
35K21.75 mi0.75 mi2606-402482-362482-364433(Top 16%)3935(Top 24%)3935(Top 70%)
23M23.00 mi1.25 mi2720-1142583-1012583-1015089(Top 18%)4373(Top 27%)4373(Top 78%)
24M24.00 mi1.00 mi2805-852658-752658-756181(Top 22%)5013(Top 31%)5013(Top 89%)
40K24.85 mi0.85 mi2905-1002747-892747-896665(Top 23%)5222(Top 32%)5222(Top 93%)
25.2M25.20 mi0.35 mi2925-202763-162763-166199(Top 22%)4832(Top 30%)4832(Top 86%)
Finish26.22 mi1.02 mi3025-1002852-892852-897078(Top 25%)5365(Top 33%)5365(Top 95%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 9%
×21stories
+97ft-345ft

Overall

2520

Males

2405

M18-39

2405

5K→10K

3.1 - 6.2 mi

Top 9%
×5stories
+79ft-138ft

Overall

2643

Males

2520

M18-39

2520

10K→15K

6.2 - 9.3 mi

Top 9%
×3stories
+67ft-78ft

Overall

2520

Males

2405

M18-39

2405

15K→20K

9.3 - 12.4 mi

Top 9%
×5stories
+106ft-86ft

Overall

2488

Males

2373

M18-39

2373

20K→Half

12.4 - 13.1 mi

Top 9%
×2stories
+19ft-37ft

Overall

2642

Males

2525

M18-39

2525

Half→25K

13.1 - 15.5 mi

Top 10%
×4stories
+66ft-88ft

Overall

2933

Males

2789

M18-39

2789

25K→30K

15.5 - 18.6 mi

Top 10%
×9stories
+181ft-148ft

Overall

2962

Males

2789

M18-39

2789

30K→20M

18.6 - 20.0 mi

Top 10%
×5stories
+64ft-50ft

Overall

2713

Males

2542

M18-39

2542

20M→21M

20.0 - 21.0 mi

Top 9%
×8stories
+106ft-24ft

Overall

2441

Males

2277

M18-39

2277

21M→35K

21.0 - 21.8 mi

Top 16%
×7stories
+17ft-86ft

Overall

4433

Males

3935

M18-39

3935

35K→23M

21.8 - 23.0 mi

Top 18%
×5stories
+23ft-63ft

Overall

5089

Males

4373

M18-39

4373

23M→24M

23.0 - 24.0 mi

Top 22%
×6stories
+12ft-82ft

Overall

6181

Males

5013

M18-39

5013

24M→40K

24.0 - 24.9 mi

Top 23%
×1story
+6ft-20ft

Overall

6665

Males

5222

M18-39

5222

40K→25.2M

24.9 - 25.2 mi

Top 22%
×1story
+13ft-16ft

Overall

6199

Males

4832

M18-39

4832

25.2M→Finish

25.2 - 26.2 mi

Top 25%
×2stories
+22ft-21ft

Overall

7078

Males

5365

M18-39

5365

Passing Analysis

Category:
Athletes Passed
731
Passed By
1029
Net Change
-298
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#2727
5K → 10K14290+52#2727#2675
10K → 15K10954+55#2675#2620
15K → 20K9734+63#2620#2557
20K → Half1721-4#2557#2561
Half → 25K4986-37#2561#2598
25K → 30K79104-25#2598#2623
30K → 20M6239+23#2623#2600
20M → 21M6632+34#2600#2566
21M → 35K2161-40#2566#2606
35K → 23M29143-114#2606#2720
23M → 24M21106-85#2720#2805
24M → 40K18118-100#2805#2905
40K → 25.2M525-20#2905#2925
25.2M → Finish16116-100#2925#3025
TOTALS7311029-298
📊

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