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BOSTON MARATHON 2025

Emma Chun

Bib: 15838•F

DC

0:00
0:00
/ mi
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Top 37%
Division (F18-39)
#0 / 5469
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
7:40/mi
23:48
↑ 97↓ 3451.5%
10K· 6.21 mi
7:34/mi
47:18
↑ 79↓ 1380.4%
15K· 9.32 mi
7:41/mi
1:11:09
↑ 67↓ 78
20K· 12.43 mi
7:55/mi
1:35:46
↑ 106↓ 860.1%
Half· 13.11 mi
7:55/mi
1:41:10
↑ 19↓ 370.5%
25K· 15.53 mi
8:14/mi
2:01:07
↑ 66↓ 880.2%
30K· 18.64 mi
8:48/mi
2:28:27
↑ 181↓ 1480.2%
20M
8:55/mi
2:40:34
↑ 64↓ 500.2%
21M
9:11/mi
2:49:45
↑ 106↓ 241.6%
35K· 21.75 mi
8:33/mi
2:56:09
↑ 17↓ 861.7%
23M
8:48/mi
3:07:10
↑ 23↓ 630.6%
24M
8:39/mi
3:15:49
↓ 821.3%
40K· 24.85 mi
8:38/mi
3:23:12
↓ 200.3%
25.2M
9:08/mi
3:26:21
↑ 13↓ 160.2%
Finish· 26.22 mi
7:59/mi
3:34:29
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:41:10
Pace7:43 /mi
2nd Half
Distance13.11 mi
Time1:53:19
Pace8:39 /mi
📊Positive Split: 12.0% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:55:5223:487:4023:48
7:40
-
10K
6.21 mi11:19:2247:187:3723:30
7:34
-0:06
15K
9.32 mi11:43:131:11:097:3823:51
7:41
+0:07
20K
12.43 mi12:07:501:35:467:4224:37
7:55
+0:14
Half
13.11 mi12:13:141:41:107:435:24
7:55
0:00
25K
15.53 mi12:33:112:01:077:4819:57
8:14
+0:19
30K
18.64 mi13:00:312:28:277:5827:20
8:48
+0:34
20M
20.00 mi13:12:382:40:348:0212:07
8:55
+0:07
21M
21.00 mi13:21:492:49:458:059:11
9:11
+0:16
35K
21.75 mi13:28:132:56:098:066:24
8:33
-0:38
23M
23.00 mi13:39:143:07:108:0811:01
8:48
+0:15
24M
24.00 mi13:47:533:15:498:108:39
8:39
-0:09
40K
24.85 mi13:55:163:23:128:117:23
8:38
-0:01
25.2M
25.20 mi13:58:253:26:218:113:09
9:08
+0:30
Finish
26.22 mi14:06:333:34:298:118:08
7:59
-1:09

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

7:34 /mi

Average Pace

8:11 /mi

Slowest Pace

9:11 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:09:15

60% of race

Time at Steady Pace

1:00:47

28% of race

Time at Slower Pace

24:27

11% of race

Average Pace: 8:11 /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 mi10:55:5223:487:4023:48
7:40
#13622
10K
6.21 mi11:19:2247:187:3723:30
7:34
#13158
15K
9.32 mi11:43:131:11:097:3823:51
7:41
#13166
20K
12.43 mi12:07:501:35:467:4224:37
7:55
#13428
Half
13.11 mi12:13:141:41:107:435:24
7:55
#13521
25K
15.53 mi12:33:112:01:077:4819:57
8:14
#13865
30K
18.64 mi13:00:312:28:277:5827:20
8:48
#14404
20M
20.00 mi13:12:382:40:348:0212:07
8:55
#14569
21M
21.00 mi13:21:492:49:458:059:11
9:11
#14534
35K
21.75 mi13:28:132:56:098:066:24
8:33
#14571
23M
23.00 mi13:39:143:07:108:0811:01
8:48
#14589
24M
24.00 mi13:47:533:15:498:108:39
8:39
#14611
40K
24.85 mi13:55:163:23:128:117:23
8:38
#14568
25.2M
25.20 mi13:58:253:26:218:113:09
9:08
#14524
Finish
26.22 mi14:06:333:34:298:118:08
7:59
#14416
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi136223670367013284(Top 47%)3610(Top 30%)3610(Top 66%)
10K6.21 mi3.10 mi13158+4643438+2323438+23212715(Top 45%)3211(Top 26%)3211(Top 59%)
15K9.32 mi3.11 mi13166-83492-543492-5413284(Top 47%)3610(Top 30%)3610(Top 66%)
20K12.43 mi3.11 mi13428-2623679-1873679-18714318(Top 50%)4261(Top 35%)4261(Top 78%)
Half13.11 mi0.68 mi13521-933744-653744-6515268(Top 54%)4765(Top 39%)4765(Top 87%)
25K15.53 mi2.42 mi13865-3443968-2243968-22415482(Top 55%)5008(Top 41%)5008(Top 92%)
30K18.64 mi3.11 mi14404-5394335-3674335-36716597(Top 58%)5800(Top 47%)5800(Top 106%)
20M20.00 mi1.36 mi14569-1654453-1184453-11816344(Top 58%)5792(Top 47%)5792(Top 106%)
21M21.00 mi1.00 mi14534+354460-74460-714550(Top 51%)4916(Top 40%)4916(Top 90%)
35K21.75 mi0.75 mi14571-374494-344494-3415810(Top 56%)5667(Top 46%)5667(Top 104%)
23M23.00 mi1.25 mi14589-184541-474541-4715112(Top 53%)5391(Top 44%)5391(Top 99%)
24M24.00 mi1.00 mi14611-224580-394580-3915462(Top 54%)5624(Top 46%)5624(Top 103%)
40K24.85 mi0.85 mi14568+434581-14581-114290(Top 50%)5119(Top 42%)5119(Top 94%)
25.2M25.20 mi0.35 mi14524+444575+64575+612633(Top 44%)4312(Top 35%)4312(Top 79%)
Finish26.22 mi1.02 mi14416+1084547+284547+2812785(Top 45%)4328(Top 35%)4328(Top 79%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 47%
×21story building
+97ft-345ft

Overall

13284

Females

3610

F18-39

3610

5K→10K

3.1 - 6.2 mi

Top 45%
×5story building
+79ft-138ft

Overall

12715

Females

3211

F18-39

3211

10K→15K

6.2 - 9.3 mi

Top 47%
×3story building
+67ft-78ft

Overall

13284

Females

3610

F18-39

3610

15K→20K

9.3 - 12.4 mi

Top 50%
×5story building
+106ft-86ft

Overall

14318

Females

4261

F18-39

4261

20K→Half

12.4 - 13.1 mi

Top 54%
×2story building
+19ft-37ft

Overall

15268

Females

4765

F18-39

4765

Half→25K

13.1 - 15.5 mi

Top 55%
×4story building
+66ft-88ft

Overall

15482

Females

5008

F18-39

5008

25K→30K

15.5 - 18.6 mi

Top 58%
×9story building
+181ft-148ft

Overall

16597

Females

5800

F18-39

5800

30K→20M

18.6 - 20.0 mi

Top 58%
×5story building
+64ft-50ft

Overall

16344

Females

5792

F18-39

5792

20M→21M

20.0 - 21.0 mi

Top 51%
×8story building
+106ft-24ft

Overall

14550

Females

4916

F18-39

4916

21M→35K

21.0 - 21.8 mi

Top 56%
×7story building
+17ft-86ft

Overall

15810

Females

5667

F18-39

5667

35K→23M

21.8 - 23.0 mi

Top 53%
×5story building
+23ft-63ft

Overall

15112

Females

5391

F18-39

5391

23M→24M

23.0 - 24.0 mi

Top 54%
×6story building
+12ft-82ft

Overall

15462

Females

5624

F18-39

5624

24M→40K

24.0 - 24.9 mi

Top 50%
×1story
+6ft-20ft

Overall

14290

Females

5119

F18-39

5119

40K→25.2M

24.9 - 25.2 mi

Top 44%
×1story
+13ft-16ft

Overall

12633

Females

4312

F18-39

4312

25.2M→Finish

25.2 - 26.2 mi

Top 45%
×2story building
+22ft-21ft

Overall

12785

Females

4328

F18-39

4328

Passing Analysis

Category:
Athletes Passed
1824
Passed By
2618
Net Change
-794
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#13622
5K → 10K564100+464#13622#13158
10K → 15K196204-8#13158#13166
15K → 20K128390-262#13166#13428
20K → Half11104-93#13428#13521
Half → 25K100444-344#13521#13865
25K → 30K118657-539#13865#14404
30K → 20M87252-165#14404#14569
20M → 21M13095+35#14569#14534
21M → 35K5693-37#14534#14571
35K → 23M86104-18#14571#14589
23M → 24M6789-22#14589#14611
24M → 40K9148+43#14611#14568
40K → 25.2M5713+44#14568#14524
25.2M → Finish13325+108#14524#14416
TOTALS18242618-794
📊

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