Boston Marathon logo
BOSTON MARATHON 2023

Charles Jacobson

Bib: 6298•M

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Top 12%
Gender (Male)
#0 / 15176
Top 20%
Masters (Masters Men)
#0 / 9891
Top 8%
Division (M40-44)
#0 / 2241
Top 21%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
21:09
Rank: #4733
Start → 5K
6:48/mi
21:09 split
10K· 6.21 mi
42:21
Rank: #5079 (-346)
5K → 10K
6:49/mi
21:12 split
15K· 9.32 mi
1:03:32
Rank: #5137 (-58)
10K → 15K
6:49/mi
21:11 split
20K· 12.43 mi
1:24:33
Rank: #4875 (+262)
15K → 20K
6:46/mi
21:01 split
Half· 13.11 mi
1:29:07
Rank: #4837 (+38)
20K → Half
6:42/mi
4:34 split
25K· 15.53 mi
1:45:27
Rank: #4566 (+271)
Half → 25K
6:44/mi
16:20 split
30K· 18.64 mi
2:06:35
Rank: #4219 (+347)
25K → 30K
6:48/mi
21:08 split
20M
2:15:49
Rank: #4057 (+162)
30K → 20M
6:48/mi
9:14 split
21M
2:22:46
Rank: #3847 (+210)
20M → 21M
6:57/mi
6:57 split
35K· 21.75 mi
2:27:38
Rank: #3769 (+78)
21M → 35K
6:30/mi
4:52 split
23M
2:35:59
Rank: #3579 (+190)
35K → 23M
6:40/mi
8:21 split
24M
2:42:32
Rank: #3493 (+86)
23M → 24M
6:33/mi
6:33 split
40K· 24.85 mi
2:48:18
Rank: #3429 (+64)
24M → 40K
6:44/mi
5:46 split
25.2M
2:50:37
Rank: #3338 (+91)
40K → 25.2M
6:44/mi
2:19 split
Finish· 26.22 mi
2:57:10
Rank: #3237 (+101)
25.2M → Finish
6:26/mi
6:33 split

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 Half
Distance13.11 mi
Time1:29:07
Pace6:48 /mi
2nd Half✓ Faster
Distance13.11 mi
Time1:28:03
Pace6:43 /mi
📊Negative Split: 1.2% faster second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:24:5221:096:4821:09
6:48
-
10K
6.21 mi10:46:0442:216:4921:12
6:49
+0:01
15K
9.32 mi11:07:151:03:326:4921:11
6:49
0:00
20K
12.43 mi11:28:161:24:336:4821:01
6:46
-0:03
Half
13.11 mi11:32:501:29:076:484:34
6:42
-0:04
25K
15.53 mi11:49:101:45:276:4716:20
6:44
+0:02
30K
18.64 mi12:10:182:06:356:4721:08
6:48
+0:04
20M
20.00 mi12:19:322:15:496:479:14
6:48
0:00
21M
21.00 mi12:26:292:22:466:486:57
6:57
+0:09
35K
21.75 mi12:31:212:27:386:474:52
6:30
-0:27
23M
23.00 mi12:39:422:35:596:478:21
6:40
+0:10
24M
24.00 mi12:46:152:42:326:466:33
6:33
-0:07
40K
24.85 mi12:52:012:48:186:465:46
6:44
+0:11
25.2M
25.20 mi12:54:202:50:376:462:19
6:44
0:00
Finish
26.22 mi13:00:532:57:106:466:33
6:26
-0:18

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

6:26 /mi

Average Pace

6:46 /mi

Slowest Pace

6:57 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

55:18

31% of race

Time at Steady Pace

2:01:52

69% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 6:45 /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 mi10:24:5221:096:4821:09
6:48
#4733
10K
6.21 mi10:46:0442:216:4921:12
6:49
#5079
15K
9.32 mi11:07:151:03:326:4921:11
6:49
#5137
20K
12.43 mi11:28:161:24:336:4821:01
6:46
#4875
Half
13.11 mi11:32:501:29:076:484:34
6:42
#4837
25K
15.53 mi11:49:101:45:276:4716:20
6:44
#4566
30K
18.64 mi12:10:182:06:356:4721:08
6:48
#4219
20M
20.00 mi12:19:322:15:496:479:14
6:48
#4057
21M
21.00 mi12:26:292:22:466:486:57
6:57
#3847
35K
21.75 mi12:31:212:27:386:474:52
6:30
#3769
23M
23.00 mi12:39:422:35:596:478:21
6:40
#3579
24M
24.00 mi12:46:152:42:326:466:33
6:33
#3493
40K
24.85 mi12:52:012:48:186:465:46
6:44
#3429
25.2M
25.20 mi12:54:202:50:376:462:19
6:44
#3338
Finish
26.22 mi13:00:532:57:106:466:33
6:26
#3237
Faster pace
Steady pace
Slower pace
Est.Checkpoint not recorded (estimated)
~Segment time uses estimated prior

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM40-44Seg. OverallSeg. MalesSeg. M40-44
5K3.11 mi3.11 mi4733440344035272(Top 20%)4869(Top 32%)4869(Top 217%)
10K6.21 mi3.10 mi5079-3464706-3034706-3035500(Top 21%)5060(Top 33%)5060(Top 226%)
15K9.32 mi3.11 mi5137-584763-574763-575272(Top 20%)4869(Top 32%)4869(Top 217%)
20K12.43 mi3.11 mi4875+2624540+2234540+2234111(Top 15%)3855(Top 25%)3855(Top 172%)
Half13.11 mi0.68 mi4837+384504+364504+364191(Top 16%)3915(Top 26%)3915(Top 175%)
25K15.53 mi2.42 mi4566+2714263+2414263+2413634(Top 14%)3423(Top 23%)3423(Top 153%)
30K18.64 mi3.11 mi4219+3473960+3033960+3032983(Top 11%)2821(Top 19%)2821(Top 126%)
20M20.00 mi1.36 mi4057+1623812+1483812+1482823(Top 11%)2658(Top 18%)2658(Top 119%)
21M21.00 mi1.00 mi3847+2103623+1893623+1891946(Top 7%)1846(Top 12%)1846(Top 82%)
35K21.75 mi0.75 mi3769+783551+723551+722455(Top 9%)2327(Top 15%)2327(Top 104%)
23M23.00 mi1.25 mi3579+1903380+1713380+1712069(Top 8%)1959(Top 13%)1959(Top 87%)
24M24.00 mi1.00 mi3493+863301+793301+792329(Top 9%)2180(Top 14%)2180(Top 97%)
40K24.85 mi0.85 mi3429+643239+623239+622513(Top 9%)2327(Top 15%)2327(Top 104%)
25.2M25.20 mi0.35 mi3338+913156+833156+83998(Top 4%)945(Top 6%)945(Top 42%)
Finish26.22 mi1.02 mi3237+1013061+953061+952146(Top 8%)1991(Top 13%)1991(Top 89%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 20%
×21story building
+97ft-345ft

Overall

5272

Males

4869

M40-44

4869

5K→10K

3.1 - 6.2 mi

Top 21%
×5story building
+79ft-138ft

Overall

5500

Males

5060

M40-44

5060

10K→15K

6.2 - 9.3 mi

Top 20%
×3story building
+67ft-78ft

Overall

5272

Males

4869

M40-44

4869

15K→20K

9.3 - 12.4 mi

Top 15%
×5story building
+106ft-86ft

Overall

4111

Males

3855

M40-44

3855

20K→Half

12.4 - 13.1 mi

Top 16%
×2story building
+19ft-37ft

Overall

4191

Males

3915

M40-44

3915

Half→25K

13.1 - 15.5 mi

Top 14%
×4story building
+66ft-88ft

Overall

3634

Males

3423

M40-44

3423

25K→30K

15.5 - 18.6 mi

Top 11%
×9story building
+181ft-148ft

Overall

2983

Males

2821

M40-44

2821

30K→20M

18.6 - 20.0 mi

Top 11%
×5story building
+64ft-50ft

Overall

2823

Males

2658

M40-44

2658

20M→21M

20.0 - 21.0 mi

Top 7%
×8story building
+106ft-24ft

Overall

1946

Males

1846

M40-44

1846

21M→35K

21.0 - 21.8 mi

Top 9%
×7story building
+17ft-86ft

Overall

2455

Males

2327

M40-44

2327

35K→23M

21.8 - 23.0 mi

Top 8%
×5story building
+23ft-63ft

Overall

2069

Males

1959

M40-44

1959

23M→24M

23.0 - 24.0 mi

Top 9%
×6story building
+12ft-82ft

Overall

2329

Males

2180

M40-44

2180

24M→40K

24.0 - 24.9 mi

Top 9%
×1story
+6ft-20ft

Overall

2513

Males

2327

M40-44

2327

40K→25.2M

24.9 - 25.2 mi

Top 4%
×1story
+13ft-16ft

Overall

998

Males

945

M40-44

945

25.2M→Finish

25.2 - 26.2 mi

Top 8%
×2story building
+22ft-21ft

Overall

2146

Males

1991

M40-44

1991

Passing Analysis

Category:
Athletes Passed
2164
Passed By
668
Net Change
+1496
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#4733
5K → 10K85431-346#4733#5079
10K → 15K92150-58#5079#5137
15K → 20K27513+262#5137#4875
20K → Half479+38#4875#4837
Half → 25K2798+271#4837#4566
25K → 30K3514+347#4566#4219
30K → 20M1664+162#4219#4057
20M → 21M2144+210#4057#3847
21M → 35K802+78#3847#3769
35K → 23M1977+190#3769#3579
23M → 24M926+86#3579#3493
24M → 40K7814+64#3493#3429
40K → 25.2M910+91#3429#3338
25.2M → Finish11716+101#3338#3237
TOTALS2164668+1496
📊

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
Share Feedback

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing