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BOSTON MARATHON 2025

Kai Renshaw

Bib: 3383•M

MA

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 4%
Gender (Male)
#0 / 16105
Top 6%
Division (M18-39)
#0 / 5642
Top 16%
Race Day Weather
50°/40°F
broken clouds

⏱️ 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
6:16/mi
19:28
↑ 97↓ 3451.5%
10K· 6.21 mi
6:20/mi
39:09
↑ 79↓ 1380.4%
15K· 9.32 mi
6:20/mi
58:49
↑ 67↓ 78
20K· 12.43 mi
6:15/mi
1:18:14
↑ 106↓ 860.1%
Half· 13.11 mi
6:14/mi
1:22:29
↑ 19↓ 370.5%
25K· 15.53 mi
6:18/mi
1:37:46
↑ 66↓ 880.2%
30K· 18.64 mi
6:05/mi
1:56:41
↑ 181↓ 1480.2%
20M
6:09/mi
2:05:03
↑ 64↓ 500.2%
21M
6:17/mi
2:11:20
↑ 106↓ 241.6%
35K· 21.75 mi
5:57/mi
2:15:47
↑ 17↓ 861.7%
23M
6:11/mi
2:23:31
↑ 23↓ 630.6%
24M
6:00/mi
2:29:31
↓ 821.3%
40K· 24.85 mi
6:03/mi
2:34:41
↓ 200.3%
25.2M
6:31/mi
2:36:56
↑ 13↓ 160.2%
Finish· 26.22 mi
5:47/mi
2:42:50
↑ 22↓ 21

The Course

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Half Splits

1st Half· via Half
Distance13.11 mi
Time1:22:29
Pace6:18 /mi
2nd Half✓ Faster
Distance13.11 mi
Time1:20:21
Pace6:08 /mi
📊Negative Split: 2.6% faster second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:20:5219:286:1619:28
6:16
-
10K
6.21 mi10:40:3339:096:1819:41
6:20
+0:04
15K
9.32 mi11:00:1358:496:1919:40
6:20
0:00
20K
12.43 mi11:19:381:18:146:1819:25
6:15
-0:05
Half
13.11 mi11:23:531:22:296:184:15
6:14
-0:01
25K
15.53 mi11:39:101:37:466:1815:17
6:18
+0:04
30K
18.64 mi11:58:051:56:416:1618:55
6:05
-0:13
20M
20.00 mi12:06:272:05:036:158:22
6:09
+0:04
21M
21.00 mi12:12:442:11:206:156:17
6:17
+0:08
35K
21.75 mi12:17:112:15:476:154:27
5:57
-0:20
23M
23.00 mi12:24:552:23:316:147:44
6:11
+0:14
24M
24.00 mi12:30:552:29:316:146:00
6:00
-0:11
40K
24.85 mi12:36:052:34:416:135:10
6:03
+0:03
25.2M
25.20 mi12:38:202:36:566:142:15
6:31
+0:28
Finish
26.22 mi12:44:142:42:506:135:54
5:47
-0:44

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

5:47 /mi

Average Pace

6:13 /mi

Slowest Pace

6:31 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:40:35

99% of race

Time at Steady Pace

2:15

1% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 6:13 /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 mi10:20:5219:286:1619:28
6:16
#2218
10K
6.21 mi10:40:3339:096:1819:41
6:20
#2405
15K
9.32 mi11:00:1358:496:1919:40
6:20
#2451
20K
12.43 mi11:19:381:18:146:1819:25
6:15
#2232
Half
13.11 mi11:23:531:22:296:184:15
6:14
#2219
25K
15.53 mi11:39:101:37:466:1815:17
6:18
#2144
30K
18.64 mi11:58:051:56:416:1618:55
6:05
#1759
20M
20.00 mi12:06:272:05:036:158:22
6:09
#1609
21M
21.00 mi12:12:442:11:206:156:17
6:17
#1469
35K
21.75 mi12:17:112:15:476:154:27
5:57
#1397
23M
23.00 mi12:24:552:23:316:147:44
6:11
#1313
24M
24.00 mi12:30:552:29:316:146:00
6:00
#1244
40K
24.85 mi12:36:052:34:416:135:10
6:03
#1181
25.2M
25.20 mi12:38:202:36:566:142:15
6:31
#1152
Finish
26.22 mi12:44:142:42:506:135:54
5:47
#1102
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi2218211821182506(Top 9%)2391(Top 15%)2391(Top 42%)
10K6.21 mi3.10 mi2405-1872292-1742292-1742630(Top 9%)2507(Top 16%)2507(Top 44%)
15K9.32 mi3.11 mi2451-462339-472339-472506(Top 9%)2391(Top 15%)2391(Top 42%)
20K12.43 mi3.11 mi2232+2192133+2062133+2061784(Top 6%)1695(Top 11%)1695(Top 30%)
Half13.11 mi0.68 mi2219+132119+142119+142071(Top 7%)1975(Top 12%)1975(Top 35%)
25K15.53 mi2.42 mi2144+752045+742045+741859(Top 7%)1767(Top 11%)1767(Top 31%)
30K18.64 mi3.11 mi1759+3851674+3711674+371659(Top 2%)617(Top 4%)617(Top 11%)
20M20.00 mi1.36 mi1609+1501524+1501524+150639(Top 2%)599(Top 4%)599(Top 11%)
21M21.00 mi1.00 mi1469+1401389+1351389+135362(Top 1%)339(Top 2%)339(Top 6%)
35K21.75 mi0.75 mi1397+721319+701319+70634(Top 2%)593(Top 4%)593(Top 11%)
23M23.00 mi1.25 mi1313+841237+821237+82639(Top 2%)603(Top 4%)603(Top 11%)
24M24.00 mi1.00 mi1244+691171+661171+66591(Top 2%)554(Top 3%)554(Top 10%)
40K24.85 mi0.85 mi1181+631112+591112+59459(Top 2%)427(Top 3%)427(Top 8%)
25.2M25.20 mi0.35 mi1152+291084+281084+28501(Top 2%)466(Top 3%)466(Top 8%)
Finish26.22 mi1.02 mi1102+501038+461038+46495(Top 2%)464(Top 3%)464(Top 8%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 9%
×21story building
+97ft-345ft

Overall

2506

Males

2391

M18-39

2391

5K→10K

3.1 - 6.2 mi

Top 9%
×5story building
+79ft-138ft

Overall

2630

Males

2507

M18-39

2507

10K→15K

6.2 - 9.3 mi

Top 9%
×3story building
+67ft-78ft

Overall

2506

Males

2391

M18-39

2391

15K→20K

9.3 - 12.4 mi

Top 6%
×5story building
+106ft-86ft

Overall

1784

Males

1695

M18-39

1695

20K→Half

12.4 - 13.1 mi

Top 7%
×2story building
+19ft-37ft

Overall

2071

Males

1975

M18-39

1975

Half→25K

13.1 - 15.5 mi

Top 7%
×4story building
+66ft-88ft

Overall

1859

Males

1767

M18-39

1767

25K→30K

15.5 - 18.6 mi

Top 2%
×9story building
+181ft-148ft

Overall

659

Males

617

M18-39

617

30K→20M

18.6 - 20.0 mi

Top 2%
×5story building
+64ft-50ft

Overall

639

Males

599

M18-39

599

20M→21M

20.0 - 21.0 mi

Top 1%
×8story building
+106ft-24ft

Overall

362

Males

339

M18-39

339

21M→35K

21.0 - 21.8 mi

Top 2%
×7story building
+17ft-86ft

Overall

634

Males

593

M18-39

593

35K→23M

21.8 - 23.0 mi

Top 2%
×5story building
+23ft-63ft

Overall

639

Males

603

M18-39

603

23M→24M

23.0 - 24.0 mi

Top 2%
×6story building
+12ft-82ft

Overall

591

Males

554

M18-39

554

24M→40K

24.0 - 24.9 mi

Top 2%
×1story
+6ft-20ft

Overall

459

Males

427

M18-39

427

40K→25.2M

24.9 - 25.2 mi

Top 2%
×1story
+13ft-16ft

Overall

501

Males

466

M18-39

466

25.2M→Finish

25.2 - 26.2 mi

Top 2%
×2story building
+22ft-21ft

Overall

495

Males

464

M18-39

464

Passing Analysis

Category:
Athletes Passed
1493
Passed By
377
Net Change
+1116
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#2218
5K → 10K41228-187#2218#2405
10K → 15K68114-46#2405#2451
15K → 20K2267+219#2451#2232
20K → Half207+13#2232#2219
Half → 25K8611+75#2219#2144
25K → 30K3861+385#2144#1759
30K → 20M1500+150#1759#1609
20M → 21M1400+140#1609#1469
21M → 35K720+72#1469#1397
35K → 23M884+84#1397#1313
23M → 24M712+69#1313#1244
24M → 40K641+63#1244#1181
40K → 25.2M301+29#1181#1152
25.2M → Finish511+50#1152#1102
TOTALS1493377+1116
📊

Passing Visuals

Category:
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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