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BOSTON MARATHON 2025

Ian Chaloner

Bib: 28537•M

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

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
27:17
Rank: #21401
Start → 5K
27:17 | 8:47/mi
10K· 6.21 mi
54:05
Rank: #20934 (+467)
5K → 10K
26:48 | 8:38/mi
15K· 9.32 mi
1:20:53
Rank: #20626 (+308)
10K → 15K
26:48 | 8:38/mi
20K· 12.43 mi
1:48:41
Rank: #20657 (-31)
15K → 20K
27:48 | 8:57/mi
Half· 13.11 mi
1:54:45
Rank: #20683 (-26)
20K → Half
6:04 | 8:54/mi
25K· 15.53 mi
2:17:42
Rank: #20925 (-242)
Half → 25K
22:57 | 9:28/mi
30K· 18.64 mi
2:48:10
Rank: #20971 (-46)
25K → 30K
30:28 | 9:48/mi
20M
3:01:06
Rank: #20812 (+159)
30K → 20M
12:56 | 9:31/mi
21M
3:12:10
Rank: #20881 (-69)
20M → 21M
11:04 | 11:04/mi
35K· 21.75 mi
3:18:39
Rank: #20726 (+155)
21M → 35K
6:29 | 8:40/mi
23M
3:32:33
Rank: #20992 (-266)
35K → 23M
13:54 | 11:06/mi
24M
3:41:50
Rank: #20910 (+82)
23M → 24M
9:17 | 9:17/mi
40K· 24.85 mi
3:51:18
Rank: #21026 (-116)
24M → 40K
9:28 | 11:04/mi
25.2M
3:55:14
Rank: #21042 (-16)
40K → 25.2M
3:56 | 11:24/mi
Finish· 26.22 mi
4:04:42
Rank: #21007 (+35)
25.2M → Finish
9:28 | 9:17/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:54:45
Pace8:45 /mi
2nd Half
Distance13.11 mi
Time2:09:57
Pace9:55 /mi
📊Positive Split: 13.2% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:43:5627:178:4727:17
8:47
-
10K
6.21 mi12:10:4454:058:4226:48
8:38
-0:09
15K
9.32 mi12:37:321:20:538:4126:48
8:38
0:00
20K
12.43 mi13:05:201:48:418:4527:48
8:57
+0:19
Half
13.11 mi13:11:241:54:458:456:04
8:54
-0:03
25K
15.53 mi13:34:212:17:428:5222:57
9:28
+0:34
30K
18.64 mi14:04:492:48:109:0130:28
9:48
+0:20
20M
20.00 mi14:17:453:01:069:0312:56
9:31
-0:17
21M
21.00 mi14:28:493:12:109:0911:04
11:04
+1:33
35K
21.75 mi14:35:183:18:399:086:29
8:40
-2:24
23M
23.00 mi14:49:123:32:339:1413:54
11:06
+2:26
24M
24.00 mi14:58:293:41:509:159:17
9:17
-1:49
40K
24.85 mi15:07:573:51:189:189:28
11:04
+1:47
25.2M
25.20 mi15:11:533:55:149:203:56
11:24
+0:20
Finish
26.22 mi15:21:214:04:429:209:28
9:17
-2:07

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

8:38 /mi

Average Pace

9:20 /mi

Slowest Pace

11:24 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:27:22

36% of race

Time at Steady Pace

1:28:30

36% of race

Time at Slower Pace

1:08:50

28% of race

Average Pace: 9:20 /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 mi11:43:5627:178:4727:17
8:47
#21401
10K
6.21 mi12:10:4454:058:4226:48
8:38
#20934
15K
9.32 mi12:37:321:20:538:4126:48
8:38
#20626
20K
12.43 mi13:05:201:48:418:4527:48
8:57
#20657
Half
13.11 mi13:11:241:54:458:456:04
8:54
#20683
25K
15.53 mi13:34:212:17:428:5222:57
9:28
#20925
30K
18.64 mi14:04:492:48:109:0130:28
9:48
#20971
20M
20.00 mi14:17:453:01:069:0312:56
9:31
#20812
21M
21.00 mi14:28:493:12:109:0911:04
11:04
#20881
35K
21.75 mi14:35:183:18:399:086:29
8:40
#20726
23M
23.00 mi14:49:123:32:339:1413:54
11:06
#20992
24M
24.00 mi14:58:293:41:509:159:17
9:17
#20910
40K
24.85 mi15:07:573:51:189:189:28
11:04
#21026
25.2M
25.20 mi15:11:533:55:149:203:56
11:24
#21042
Finish
26.22 mi15:21:214:04:429:209:28
9:17
#21007
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi21401130391303920063(Top 71%)12537(Top 78%)12537(Top 222%)
10K6.21 mi3.10 mi20934+46712856+18312856+18320474(Top 72%)12690(Top 79%)12690(Top 225%)
15K9.32 mi3.11 mi20626+30812746+11012746+11020063(Top 71%)12537(Top 78%)12537(Top 222%)
20K12.43 mi3.11 mi20657-3112756-1012756-1020703(Top 73%)12755(Top 79%)12755(Top 226%)
Half13.11 mi0.68 mi20683-2612762-612762-621321(Top 75%)13051(Top 81%)13051(Top 231%)
25K15.53 mi2.42 mi20925-24212866-10412866-10421743(Top 77%)13174(Top 82%)13174(Top 233%)
30K18.64 mi3.11 mi20971-4612839+2712839+2721012(Top 74%)12723(Top 79%)12723(Top 226%)
20M20.00 mi1.36 mi20812+15912754+8512754+8519251(Top 68%)11805(Top 73%)11805(Top 209%)
21M21.00 mi1.00 mi20881-6912770-1612770-1621573(Top 76%)12767(Top 79%)12767(Top 226%)
35K21.75 mi0.75 mi20726+15512687+8312687+8316473(Top 58%)10396(Top 65%)10396(Top 184%)
23M23.00 mi1.25 mi20992-26612777-9012777-9023450(Top 83%)13563(Top 84%)13563(Top 240%)
24M24.00 mi1.00 mi20910+8212722+5512722+5518739(Top 66%)11295(Top 70%)11295(Top 200%)
40K24.85 mi0.85 mi21026-11612751-2912751-2923306(Top 82%)13397(Top 83%)13397(Top 237%)
25.2M25.20 mi0.35 mi21042-1612750+112750+121781(Top 77%)12678(Top 79%)12678(Top 225%)
Finish26.22 mi1.02 mi21007+3512723+2712723+2720331(Top 72%)11974(Top 74%)11974(Top 212%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 71%
×21stories
+97ft-345ft

Overall

20063

Males

12537

M18-39

12537

5K→10K

3.1 - 6.2 mi

Top 72%
×5stories
+79ft-138ft

Overall

20474

Males

12690

M18-39

12690

10K→15K

6.2 - 9.3 mi

Top 71%
×3stories
+67ft-78ft

Overall

20063

Males

12537

M18-39

12537

15K→20K

9.3 - 12.4 mi

Top 73%
×5stories
+106ft-86ft

Overall

20703

Males

12755

M18-39

12755

20K→Half

12.4 - 13.1 mi

Top 75%
×2stories
+19ft-37ft

Overall

21321

Males

13051

M18-39

13051

Half→25K

13.1 - 15.5 mi

Top 77%
×4stories
+66ft-88ft

Overall

21743

Males

13174

M18-39

13174

25K→30K

15.5 - 18.6 mi

Top 74%
×9stories
+181ft-148ft

Overall

21012

Males

12723

M18-39

12723

30K→20M

18.6 - 20.0 mi

Top 68%
×5stories
+64ft-50ft

Overall

19251

Males

11805

M18-39

11805

20M→21M

20.0 - 21.0 mi

Top 76%
×8stories
+106ft-24ft

Overall

21573

Males

12767

M18-39

12767

21M→35K

21.0 - 21.8 mi

Top 58%
×7stories
+17ft-86ft

Overall

16473

Males

10396

M18-39

10396

35K→23M

21.8 - 23.0 mi

Top 83%
×5stories
+23ft-63ft

Overall

23450

Males

13563

M18-39

13563

23M→24M

23.0 - 24.0 mi

Top 66%
×6stories
+12ft-82ft

Overall

18739

Males

11295

M18-39

11295

24M→40K

24.0 - 24.9 mi

Top 82%
×1story
+6ft-20ft

Overall

23306

Males

13397

M18-39

13397

40K→25.2M

24.9 - 25.2 mi

Top 77%
×1story
+13ft-16ft

Overall

21781

Males

12678

M18-39

12678

25.2M→Finish

25.2 - 26.2 mi

Top 72%
×2stories
+22ft-21ft

Overall

20331

Males

11974

M18-39

11974

Passing Analysis

Category:
Athletes Passed
2111
Passed By
1717
Net Change
+394
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#21401
5K → 10K584117+467#21401#20934
10K → 15K38274+308#20934#20626
15K → 20K175206-31#20626#20657
20K → Half2450-26#20657#20683
Half → 25K81323-242#20683#20925
25K → 30K192238-46#20925#20971
30K → 20M19132+159#20971#20812
20M → 21M72141-69#20812#20881
21M → 35K1550+155#20881#20726
35K → 23M38304-266#20726#20992
23M → 24M10321+82#20992#20910
24M → 40K23139-116#20910#21026
40K → 25.2M2541-16#21026#21042
25.2M → Finish6631+35#21042#21007
TOTALS21111717+394
📊

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