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BOSTON MARATHON 2025

James Lum

Bib: 6812•M

OR

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 8%
Gender (Male)
#0 / 16105
Top 13%
Division (M18-39)
#0 / 5642
Top 30%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
20:26
Rank: #4374
Start → 5K
6:35/mi
20:26 split
10K· 6.21 mi
40:42
Rank: #4129 (+245)
5K → 10K
6:31/mi
20:16 split
15K· 9.32 mi
1:00:33
Rank: #3667 (+462)
10K → 15K
6:23/mi
19:51 split
20K· 12.43 mi
1:20:19
Rank: #3239 (+428)
15K → 20K
6:22/mi
19:46 split
Half· 13.11 mi
1:24:35
Rank: #3180 (+59)
20K → Half
6:15/mi
4:16 split
25K· 15.53 mi
1:40:09
Rank: #3028 (+152)
Half → 25K
6:25/mi
15:34 split
30K· 18.64 mi
2:00:34
Rank: #2833 (+195)
25K → 30K
6:34/mi
20:25 split
20M
2:09:25
Rank: #2697 (+136)
30K → 20M
6:31/mi
8:51 split
21M
2:16:11
Rank: #2577 (+120)
20M → 21M
6:46/mi
6:46 split
35K· 21.75 mi
2:20:54
Rank: #2517 (+60)
21M → 35K
6:18/mi
4:43 split
23M
2:29:13
Rank: #2458 (+59)
35K → 23M
6:39/mi
8:19 split
24M
2:35:25
Rank: #2349 (+109)
23M → 24M
6:12/mi
6:12 split
40K· 24.85 mi
2:40:54
Rank: #2281 (+68)
24M → 40K
6:25/mi
5:29 split
25.2M
2:43:24
Rank: #2265 (+16)
40K → 25.2M
7:15/mi
2:30 split
Finish· 26.22 mi
2:49:35
Rank: #2189 (+76)
25.2M → Finish
6:04/mi
6:11 split

The Course

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Half Splits

1st Half· via Half⚖️ Balanced
Distance13.11 mi
Time1:24:35
Pace6:27 /mi
2nd Half⚖️ Balanced
Distance13.11 mi
Time1:25:00
Pace6:29 /mi
📊Even Split: Consistent pacing between halves

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:26:2320:266:3520:26
6:35
-
10K
6.21 mi10:46:3940:426:3320:16
6:31
-0:04
15K
9.32 mi11:06:301:00:336:3019:51
6:23
-0:08
20K
12.43 mi11:26:161:20:196:2819:46
6:22
-0:01
Half
13.11 mi11:30:321:24:356:274:16
6:15
-0:07
25K
15.53 mi11:46:061:40:096:2715:34
6:25
+0:10
30K
18.64 mi12:06:312:00:346:2820:25
6:34
+0:09
20M
20.00 mi12:15:222:09:256:288:51
6:31
-0:03
21M
21.00 mi12:22:082:16:116:296:46
6:46
+0:15
35K
21.75 mi12:26:512:20:546:294:43
6:18
-0:28
23M
23.00 mi12:35:102:29:136:298:19
6:39
+0:21
24M
24.00 mi12:41:222:35:256:296:12
6:12
-0:27
40K
24.85 mi12:46:512:40:546:285:29
6:25
+0:13
25.2M
25.20 mi12:49:212:43:246:292:30
7:15
+0:50
Finish
26.22 mi12:55:322:49:356:286:11
6:04
-1:11

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

6:04 /mi

Average Pace

6:28 /mi

Slowest Pace

7:15 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:40:19

95% of race

Time at Steady Pace

6:46

4% of race

Time at Slower Pace

2:30

1% of race

Average Pace: 6:28 /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 mi10:26:2320:266:3520:26
6:35
#4374
10K
6.21 mi10:46:3940:426:3320:16
6:31
#4129
15K
9.32 mi11:06:301:00:336:3019:51
6:23
#3667
20K
12.43 mi11:26:161:20:196:2819:46
6:22
#3239
Half
13.11 mi11:30:321:24:356:274:16
6:15
#3180
25K
15.53 mi11:46:061:40:096:2715:34
6:25
#3028
30K
18.64 mi12:06:312:00:346:2820:25
6:34
#2833
20M
20.00 mi12:15:222:09:256:288:51
6:31
#2697
21M
21.00 mi12:22:082:16:116:296:46
6:46
#2577
35K
21.75 mi12:26:512:20:546:294:43
6:18
#2517
23M
23.00 mi12:35:102:29:136:298:19
6:39
#2458
24M
24.00 mi12:41:222:35:256:296:12
6:12
#2349
40K
24.85 mi12:46:512:40:546:285:29
6:25
#2281
25.2M
25.20 mi12:49:212:43:246:292:30
7:15
#2265
Finish
26.22 mi12:55:322:49:356:286:11
6:04
#2189
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi4374411141112854(Top 10%)2719(Top 17%)2719(Top 48%)
10K6.21 mi3.10 mi4129+2453891+2203891+2203885(Top 14%)3659(Top 23%)3659(Top 65%)
15K9.32 mi3.11 mi3667+4623468+4233468+4232854(Top 10%)2719(Top 17%)2719(Top 48%)
20K12.43 mi3.11 mi3239+4283084+3843084+3842321(Top 8%)2214(Top 14%)2214(Top 39%)
Half13.11 mi0.68 mi3180+593029+553029+552230(Top 8%)2131(Top 13%)2131(Top 38%)
25K15.53 mi2.42 mi3028+1522886+1432886+1432467(Top 9%)2345(Top 15%)2345(Top 42%)
30K18.64 mi3.11 mi2833+1952697+1892697+1892274(Top 8%)2153(Top 13%)2153(Top 38%)
20M20.00 mi1.36 mi2697+1362568+1292568+1291670(Top 6%)1578(Top 10%)1578(Top 28%)
21M21.00 mi1.00 mi2577+1202456+1122456+1121420(Top 5%)1340(Top 8%)1340(Top 24%)
35K21.75 mi0.75 mi2517+602397+592397+591624(Top 6%)1524(Top 9%)1524(Top 27%)
23M23.00 mi1.25 mi2458+592340+572340+571994(Top 7%)1864(Top 12%)1864(Top 33%)
24M24.00 mi1.00 mi2349+1092236+1042236+1041033(Top 4%)972(Top 6%)972(Top 17%)
40K24.85 mi0.85 mi2281+682168+682168+681295(Top 5%)1202(Top 7%)1202(Top 21%)
25.2M25.20 mi0.35 mi2265+162152+162152+162299(Top 8%)2052(Top 13%)2052(Top 36%)
Finish26.22 mi1.02 mi2189+762078+742078+741100(Top 4%)1030(Top 6%)1030(Top 18%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 10%
×21stories
+97ft-345ft

Overall

2854

Males

2719

M18-39

2719

5K→10K

3.1 - 6.2 mi

Top 14%
×5stories
+79ft-138ft

Overall

3885

Males

3659

M18-39

3659

10K→15K

6.2 - 9.3 mi

Top 10%
×3stories
+67ft-78ft

Overall

2854

Males

2719

M18-39

2719

15K→20K

9.3 - 12.4 mi

Top 8%
×5stories
+106ft-86ft

Overall

2321

Males

2214

M18-39

2214

20K→Half

12.4 - 13.1 mi

Top 8%
×2stories
+19ft-37ft

Overall

2230

Males

2131

M18-39

2131

Half→25K

13.1 - 15.5 mi

Top 9%
×4stories
+66ft-88ft

Overall

2467

Males

2345

M18-39

2345

25K→30K

15.5 - 18.6 mi

Top 8%
×9stories
+181ft-148ft

Overall

2274

Males

2153

M18-39

2153

30K→20M

18.6 - 20.0 mi

Top 6%
×5stories
+64ft-50ft

Overall

1670

Males

1578

M18-39

1578

20M→21M

20.0 - 21.0 mi

Top 5%
×8stories
+106ft-24ft

Overall

1420

Males

1340

M18-39

1340

21M→35K

21.0 - 21.8 mi

Top 6%
×7stories
+17ft-86ft

Overall

1624

Males

1524

M18-39

1524

35K→23M

21.8 - 23.0 mi

Top 7%
×5stories
+23ft-63ft

Overall

1994

Males

1864

M18-39

1864

23M→24M

23.0 - 24.0 mi

Top 4%
×6stories
+12ft-82ft

Overall

1033

Males

972

M18-39

972

24M→40K

24.0 - 24.9 mi

Top 5%
×1story
+6ft-20ft

Overall

1295

Males

1202

M18-39

1202

40K→25.2M

24.9 - 25.2 mi

Top 8%
×1story
+13ft-16ft

Overall

2299

Males

2052

M18-39

2052

25.2M→Finish

25.2 - 26.2 mi

Top 4%
×2stories
+22ft-21ft

Overall

1100

Males

1030

M18-39

1030

Passing Analysis

Category:
Athletes Passed
2332
Passed By
147
Net Change
+2185
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#4374
5K → 10K30156+245#4374#4129
10K → 15K4642+462#4129#3667
15K → 20K4291+428#3667#3239
20K → Half601+59#3239#3180
Half → 25K1575+152#3180#3028
25K → 30K22429+195#3028#2833
30K → 20M1437+136#2833#2697
20M → 21M1255+120#2697#2577
21M → 35K655+60#2577#2517
35K → 23M7819+59#2517#2458
23M → 24M1112+109#2458#2349
24M → 40K735+68#2349#2281
40K → 25.2M215+16#2281#2265
25.2M → Finish815+76#2265#2189
TOTALS2332147+2185
📊

Passing Visuals

Category:
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🔥Passing Intensity

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🔄Passing Circle

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🌊Position Flow

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🏃Race Lanes

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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing