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BOSTON MARATHON 2025

Kal Iyer

CA

Bib: 18713 M

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Top 37%
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Top 40%
Division (M55-59)
#0 / 1648
Top 22%
Race Day Weather
50°/40°F
broken clouds

Race Timeline

Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
469 ft elev
5K· 3.11 mi
7:38/mi
23:42
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
7:29/mi
46:56
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
7:32/mi
1:10:19
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
7:34/mi
1:33:51
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
7:21/mi
1:38:52
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
7:28/mi
1:56:59
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
7:39/mi
2:20:45
↑ 181↓ 1480.2%
138 ft elev
20M
7:44/mi
2:31:16
↑ 64↓ 500.2%
148 ft elev
21M
8:38/mi
2:39:54
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
7:33/mi
2:45:33
↑ 17↓ 861.7%
156 ft elev
23M
7:55/mi
2:55:28
↑ 23↓ 630.6%
116 ft elev
24M
7:48/mi
3:03:16
↓ 821.3%
34 ft elev
40K· 24.85 mi
8:08/mi
3:10:13
↓ 200.3%
20 ft elev
25.2M
9:20/mi
3:13:26
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
8:01/mi
3:21:36
↑ 22↓ 21
17 ft elev
Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent

The Course

Half Splits

1st Half· via Half
1:38:527:32 /mi⚡ faster
2nd Half
1:42:447:50 /mi+3.9%
Positive split — 3.9% slower in the second half
Is this your race?

Your race, unpacked

See your splits, ranks & AI insights.

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:14:3923:427:3823:42
7:38
-
10K
6.21 mi11:37:5346:567:3323:14
7:29
-0:09
15K
9.32 mi12:01:161:10:197:3323:23
7:32
+0:03
20K
12.43 mi12:24:481:33:517:3323:32
7:34
+0:02
Half
13.11 mi12:29:491:38:527:325:01
7:21
-0:13
25K
15.53 mi12:47:561:56:597:3218:07
7:28
+0:07
30K
18.64 mi13:11:422:20:457:3323:46
7:39
+0:11
20M
20.00 mi13:22:132:31:167:3410:31
7:44
+0:05
21M
21.00 mi13:30:512:39:547:378:38
8:38
+0:54
35K
21.75 mi13:36:302:45:337:375:39
7:33
-1:05
23M
23.00 mi13:46:252:55:287:389:55
7:55
+0:22
24M
24.00 mi13:54:133:03:167:387:48
7:48
-0:07
40K
24.85 mi14:01:103:10:137:396:57
8:08
+0:20
25.2M
25.20 mi14:04:233:13:267:413:13
9:20
+1:12
Finish
26.22 mi14:12:333:21:367:428:10
8:01
-1:19

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

7:21 /mi

Average Pace

7:42 /mi

Slowest Pace

9:20 /mi

Loading chart...
Fastest
Middle
Slowest
Average

Segments

Segment Time Comparison

Time at Faster Pace

5:01

2% of race

Time at Steady Pace

2:39:42

79% of race

Time at Slower Pace

36:53

18% of race

Average Pace: 7:41 /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 mi11:14:3923:427:3823:42
7:38
#13342
10K
6.21 mi11:37:5346:567:3323:14
7:29
#12597
15K
9.32 mi12:01:161:10:197:3323:23
7:32
#12366
20K
12.43 mi12:24:481:33:517:3323:32
7:34
#12099
Half
13.11 mi12:29:491:38:527:325:01
7:21
#11993
25K
15.53 mi12:47:561:56:597:3218:07
7:28
#11590
30K
18.64 mi13:11:422:20:457:3323:46
7:39
#11026
20M
20.00 mi13:22:132:31:167:3410:31
7:44
#10801
21M
21.00 mi13:30:512:39:547:378:38
8:38
#10781
35K
21.75 mi13:36:302:45:337:375:39
7:33
#10700
23M
23.00 mi13:46:252:55:287:389:55
7:55
#10586
24M
24.00 mi13:54:133:03:167:387:48
7:48
#10518
40K
24.85 mi14:01:103:10:137:396:57
8:08
#10506
25.2M
25.20 mi14:04:233:13:267:413:13
9:20
#10532
Finish
26.22 mi14:12:333:21:367:428:10
8:01
#10617
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM55-59Seg. OverallSeg. MalesSeg. M55-59
5K3.11 mi3.11 mi13342979097901198490579057
10K6.21 mi3.10 mi12597+7459434+3569434+3561188090939093
15K9.32 mi3.11 mi12366+2319297+1379297+1371198490579057
20K12.43 mi3.11 mi12099+2679139+1589139+1581137086728672
Half13.11 mi0.68 mi11993+1069087+529087+521044482578257
25K15.53 mi2.42 mi11590+4038858+2298858+229972577197719
30K18.64 mi3.11 mi11026+5648513+3458513+345882170477047
20M20.00 mi1.36 mi10801+2258363+1508363+150862768066806
21M21.00 mi1.00 mi10781+208317+468317+461126480088008
35K21.75 mi0.75 mi10700+818263+548263+54900868706870
23M23.00 mi1.25 mi10586+1148166+978166+97943569456945
24M24.00 mi1.00 mi10518+688096+708096+70979170627062
40K24.85 mi0.85 mi10506+128063+338063+331105975957595
25.2M25.20 mi0.35 mi10532-268058+58058+51352386938693
Finish26.22 mi1.02 mi10617-858061-38061-31294785008500

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 42%
×21story building
+97ft-345ft

Overall

11984

Males

9057

M55-59

9057

5K→10K

3.1 - 6.2 mi

Top 42%
×5story building
+79ft-138ft

Overall

11880

Males

9093

M55-59

9093

10K→15K

6.2 - 9.3 mi

Top 42%
×3story building
+67ft-78ft

Overall

11984

Males

9057

M55-59

9057

15K→20K

9.3 - 12.4 mi

Top 40%
×5story building
+106ft-86ft

Overall

11370

Males

8672

M55-59

8672

20K→Half

12.4 - 13.1 mi

Top 37%
×2story building
+19ft-37ft

Overall

10444

Males

8257

M55-59

8257

Half→25K

13.1 - 15.5 mi

Top 34%
×4story building
+66ft-88ft

Overall

9725

Males

7719

M55-59

7719

25K→30K

15.5 - 18.6 mi

Top 31%
×9story building
+181ft-148ft

Overall

8821

Males

7047

M55-59

7047

30K→20M

18.6 - 20.0 mi

Top 30%
×5story building
+64ft-50ft

Overall

8627

Males

6806

M55-59

6806

20M→21M

20.0 - 21.0 mi

Top 40%
×8story building
+106ft-24ft

Overall

11264

Males

8008

M55-59

8008

21M→35K

21.0 - 21.8 mi

Top 32%
×7story building
+17ft-86ft

Overall

9008

Males

6870

M55-59

6870

35K→23M

21.8 - 23.0 mi

Top 33%
×5story building
+23ft-63ft

Overall

9435

Males

6945

M55-59

6945

23M→24M

23.0 - 24.0 mi

Top 34%
×6story building
+12ft-82ft

Overall

9791

Males

7062

M55-59

7062

24M→40K

24.0 - 24.9 mi

Top 39%
×1story
+6ft-20ft

Overall

11059

Males

7595

M55-59

7595

40K→25.2M

24.9 - 25.2 mi

Top 48%
×1story
+13ft-16ft

Overall

13523

Males

8693

M55-59

8693

25.2M→Finish

25.2 - 26.2 mi

Top 46%
×2story building
+22ft-21ft

Overall

12947

Males

8500

M55-59

8500

Passing Analysis

Category:
Athletes Passed
3437
Passed By
712
Net Change
+2725
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#13342
5K → 10K81065+745#13342#12597
10K → 15K31988+231#12597#12366
15K → 20K32962+267#12366#12099
20K → Half1093+106#12099#11993
Half → 25K41613+403#11993#11590
25K → 30K58622+564#11590#11026
30K → 20M24217+225#11026#10801
20M → 21M10282+20#10801#10781
21M → 35K9817+81#10781#10700
35K → 23M16450+114#10700#10586
23M → 24M11244+68#10586#10518
24M → 40K7159+12#10518#10506
40K → 25.2M3258-26#10506#10532
25.2M → Finish47132-85#10532#10617
TOTALS3437712+2725

Passing Charts

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