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BOSTON MARATHON 2025

Ka Chen

Bib: 18284•F

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Top 45%
Masters (Masters Women)
#0 / 6759
Top 32%
Division (F40-44)
#0 / 1718
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
8:02/mi
24:58
↑ 97↓ 3451.5%
10K· 6.21 mi
7:53/mi
49:27
↑ 79↓ 1380.4%
15K· 9.32 mi
7:51/mi
1:13:51
↑ 67↓ 78
20K· 12.43 mi
8:04/mi
1:38:55
↑ 106↓ 860.1%
Half· 13.11 mi
8:04/mi
1:44:25
↑ 19↓ 370.5%
25K· 15.53 mi
8:24/mi
2:04:47
↑ 66↓ 880.2%
30K· 18.64 mi
9:06/mi
2:33:04
↑ 181↓ 1480.2%
20M
9:10/mi
2:45:32
↑ 64↓ 500.2%
21M
10:05/mi
2:55:37
↑ 106↓ 241.6%
35K· 21.75 mi
8:28/mi
3:01:57
↑ 17↓ 861.7%
23M
8:55/mi
3:13:07
↑ 23↓ 630.6%
24M
8:32/mi
3:21:39
↓ 821.3%
40K· 24.85 mi
8:29/mi
3:28:54
↓ 200.3%
25.2M
9:20/mi
3:32:07
↑ 13↓ 160.2%
Finish· 26.22 mi
8:22/mi
3:40:39
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:44:25
Pace7:58 /mi
2nd Half
Distance13.11 mi
Time1:56:14
Pace8:52 /mi
📊Positive Split: 11.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:16:1724:588:0224:58
8:02
-
10K
6.21 mi11:40:4649:277:5724:29
7:53
-0:09
15K
9.32 mi12:05:101:13:517:5524:24
7:51
-0:02
20K
12.43 mi12:30:141:38:557:5825:04
8:04
+0:13
Half
13.11 mi12:35:441:44:257:585:30
8:04
0:00
25K
15.53 mi12:56:062:04:478:0220:22
8:24
+0:20
30K
18.64 mi13:24:232:33:048:1328:17
9:06
+0:42
20M
20.00 mi13:36:512:45:328:1712:28
9:10
+0:04
21M
21.00 mi13:46:562:55:378:2210:05
10:05
+0:55
35K
21.75 mi13:53:163:01:578:226:20
8:28
-1:37
23M
23.00 mi14:04:263:13:078:2411:10
8:55
+0:27
24M
24.00 mi14:12:583:21:398:248:32
8:32
-0:23
40K
24.85 mi14:20:133:28:548:247:15
8:29
-0:03
25.2M
25.20 mi14:23:263:32:078:253:13
9:20
+0:51
Finish
26.22 mi14:31:583:40:398:258:32
8:22
-0:58

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

7:51 /mi

Average Pace

8:25 /mi

Slowest Pace

10:05 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:44:25

47% of race

Time at Steady Pace

51:01

23% of race

Time at Slower Pace

1:05:13

30% of race

Average Pace: 8:25 /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 mi11:16:1724:588:0224:58
8:02
#16879
10K
6.21 mi11:40:4649:277:5724:29
7:53
#16165
15K
9.32 mi12:05:101:13:517:5524:24
7:51
#15711
20K
12.43 mi12:30:141:38:557:5825:04
8:04
#15633
Half
13.11 mi12:35:441:44:257:585:30
8:04
#15670
25K
15.53 mi12:56:062:04:478:0220:22
8:24
#15832
30K
18.64 mi13:24:232:33:048:1328:17
9:06
#16289
20M
20.00 mi13:36:512:45:328:1712:28
9:10
#16349
21M
21.00 mi13:46:562:55:378:2210:05
10:05
#16481
35K
21.75 mi13:53:163:01:578:226:20
8:28
#16392
23M
23.00 mi14:04:263:13:078:2411:10
8:55
#16313
24M
24.00 mi14:12:583:21:398:248:32
8:32
#16214
40K
24.85 mi14:20:133:28:548:247:15
8:29
#16106
25.2M
25.20 mi14:23:263:32:078:253:13
9:20
#16055
Finish
26.22 mi14:31:583:40:398:258:32
8:22
#16031
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF40-44Seg. OverallSeg. FemalesSeg. F40-44
5K3.11 mi3.11 mi168795672567214862(Top 52%)4508(Top 37%)4508(Top 262%)
10K6.21 mi3.10 mi16165+7145244+4285244+42815541(Top 55%)4857(Top 40%)4857(Top 283%)
15K9.32 mi3.11 mi15711+4544959+2854959+28514862(Top 52%)4508(Top 37%)4508(Top 262%)
20K12.43 mi3.11 mi15633+784950+94950+915423(Top 54%)4875(Top 40%)4875(Top 284%)
Half13.11 mi0.68 mi15670-374975-254975-2516425(Top 58%)5430(Top 44%)5430(Top 316%)
25K15.53 mi2.42 mi15832-1625072-975072-9716587(Top 58%)5623(Top 46%)5623(Top 327%)
30K18.64 mi3.11 mi16289-4575408-3365408-33618193(Top 64%)6685(Top 55%)6685(Top 389%)
20M20.00 mi1.36 mi16349-605462-545462-5417653(Top 62%)6497(Top 53%)6497(Top 378%)
21M21.00 mi1.00 mi16481-1325572-1105572-11018611(Top 66%)7124(Top 58%)7124(Top 415%)
35K21.75 mi0.75 mi16392+895537+355537+3515283(Top 54%)5394(Top 44%)5394(Top 314%)
23M23.00 mi1.25 mi16313+795523+145523+1415802(Top 56%)5773(Top 47%)5773(Top 336%)
24M24.00 mi1.00 mi16214+995505+185505+1814760(Top 52%)5248(Top 43%)5248(Top 305%)
40K24.85 mi0.85 mi16106+1085465+405465+4013346(Top 47%)4633(Top 38%)4633(Top 270%)
25.2M25.20 mi0.35 mi16055+515447+185447+1813685(Top 48%)4865(Top 40%)4865(Top 283%)
Finish26.22 mi1.02 mi16031+245447544715411(Top 54%)5700(Top 47%)5700(Top 332%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 52%
×21story building
+97ft-345ft

Overall

14862

Females

4508

F40-44

4508

5K→10K

3.1 - 6.2 mi

Top 55%
×5story building
+79ft-138ft

Overall

15541

Females

4857

F40-44

4857

10K→15K

6.2 - 9.3 mi

Top 52%
×3story building
+67ft-78ft

Overall

14862

Females

4508

F40-44

4508

15K→20K

9.3 - 12.4 mi

Top 54%
×5story building
+106ft-86ft

Overall

15423

Females

4875

F40-44

4875

20K→Half

12.4 - 13.1 mi

Top 58%
×2story building
+19ft-37ft

Overall

16425

Females

5430

F40-44

5430

Half→25K

13.1 - 15.5 mi

Top 58%
×4story building
+66ft-88ft

Overall

16587

Females

5623

F40-44

5623

25K→30K

15.5 - 18.6 mi

Top 64%
×9story building
+181ft-148ft

Overall

18193

Females

6685

F40-44

6685

30K→20M

18.6 - 20.0 mi

Top 62%
×5story building
+64ft-50ft

Overall

17653

Females

6497

F40-44

6497

20M→21M

20.0 - 21.0 mi

Top 66%
×8story building
+106ft-24ft

Overall

18611

Females

7124

F40-44

7124

21M→35K

21.0 - 21.8 mi

Top 54%
×7story building
+17ft-86ft

Overall

15283

Females

5394

F40-44

5394

35K→23M

21.8 - 23.0 mi

Top 56%
×5story building
+23ft-63ft

Overall

15802

Females

5773

F40-44

5773

23M→24M

23.0 - 24.0 mi

Top 52%
×6story building
+12ft-82ft

Overall

14760

Females

5248

F40-44

5248

24M→40K

24.0 - 24.9 mi

Top 47%
×1story
+6ft-20ft

Overall

13346

Females

4633

F40-44

4633

40K→25.2M

24.9 - 25.2 mi

Top 48%
×1story
+13ft-16ft

Overall

13685

Females

4865

F40-44

4865

25.2M→Finish

25.2 - 26.2 mi

Top 54%
×2story building
+22ft-21ft

Overall

15411

Females

5700

F40-44

5700

Passing Analysis

Category:
Athletes Passed
2602
Passed By
1754
Net Change
+848
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#16879
5K → 10K78571+714#16879#16165
10K → 15K50652+454#16165#15711
15K → 20K247169+78#15711#15633
20K → Half1754-37#15633#15670
Half → 25K133295-162#15670#15832
25K → 30K114571-457#15832#16289
30K → 20M87147-60#16289#16349
20M → 21M70202-132#16349#16481
21M → 35K10819+89#16481#16392
35K → 23M14465+79#16392#16313
23M → 24M13031+99#16313#16214
24M → 40K12214+108#16214#16106
40K → 25.2M6312+51#16106#16055
25.2M → Finish7652+24#16055#16031
TOTALS26021754+848
📊

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