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BOSTON MARATHON 2025

Jing Chai

Bib: 10404•F

MI

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 21%
Gender (Female)
#0 / 12228
Top 5%
Division (F18-39)
#0 / 5469
Top 10%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
23:13
Rank: #12014
Start → 5K
23:13 | 7:28/mi
10K· 6.21 mi
45:29
Rank: #10501 (+1513)
5K → 10K
22:16 | 7:10/mi
15K· 9.32 mi
1:07:37
Rank: #9796 (+705)
10K → 15K
22:08 | 7:07/mi
20K· 12.43 mi
1:29:41
Rank: #9135 (+661)
15K → 20K
22:04 | 7:06/mi
Half· 13.11 mi
1:34:24
Rank: #8996 (+139)
20K → Half
4:43 | 6:55/mi
25K· 15.53 mi
1:51:42
Rank: #8599 (+397)
Half → 25K
17:18 | 7:08/mi
30K· 18.64 mi
2:14:22
Rank: #8090 (+509)
25K → 30K
22:40 | 7:18/mi
20M
2:24:05
Rank: #7774 (+316)
30K → 20M
9:43 | 7:09/mi
21M
2:31:22
Rank: #7432 (+342)
20M → 21M
7:17 | 7:17/mi
35K· 21.75 mi
2:36:19
Rank: #7237 (+195)
21M → 35K
4:57 | 6:37/mi
23M
2:44:55
Rank: #6913 (+324)
35K → 23M
8:36 | 6:52/mi
24M
2:51:32
Rank: #6603 (+310)
23M → 24M
6:37 | 6:37/mi
40K· 24.85 mi
2:57:10
Rank: #6368 (+235)
24M → 40K
5:38 | 6:35/mi
25.2M
2:59:39
Rank: #6275 (+93)
40K → 25.2M
2:29 | 7:12/mi
Finish· 26.22 mi
3:05:59
Rank: #5979 (+296)
25.2M → Finish
6:20 | 6:13/mi

The Course

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Half Splits

1st Half· via Half
Distance13.11 mi
Time1:34:24
Pace7:12 /mi
2nd Half✓ Faster
Distance13.11 mi
Time1:31:35
Pace6:59 /mi
📊Negative Split: 3.0% faster second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:49:3523:137:2823:13
7:28
-
10K
6.21 mi11:11:5145:297:1922:16
7:10
-0:18
15K
9.32 mi11:33:591:07:377:1522:08
7:07
-0:03
20K
12.43 mi11:56:031:29:417:1322:04
7:06
-0:01
Half
13.11 mi12:00:461:34:247:124:43
6:55
-0:11
25K
15.53 mi12:18:041:51:427:1117:18
7:08
+0:13
30K
18.64 mi12:40:442:14:227:1222:40
7:18
+0:10
20M
20.00 mi12:50:272:24:057:129:43
7:09
-0:09
21M
21.00 mi12:57:442:31:227:127:17
7:17
+0:08
35K
21.75 mi13:02:412:36:197:114:57
6:37
-0:40
23M
23.00 mi13:11:172:44:557:108:36
6:52
+0:15
24M
24.00 mi13:17:542:51:327:096:37
6:37
-0:15
40K
24.85 mi13:23:322:57:107:085:38
6:35
-0:02
25.2M
25.20 mi13:26:012:59:397:082:29
7:12
+0:37
Finish
26.22 mi13:32:213:05:597:066:20
6:13
-0:59

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

6:13 /mi

Average Pace

7:06 /mi

Slowest Pace

7:28 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

36:51

20% of race

Time at Steady Pace

1:35:58

52% of race

Time at Slower Pace

53:10

29% of race

Average Pace: 7:06 /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 mi10:49:3523:137:2823:13
7:28
#12014
10K
6.21 mi11:11:5145:297:1922:16
7:10
#10501
15K
9.32 mi11:33:591:07:377:1522:08
7:07
#9796
20K
12.43 mi11:56:031:29:417:1322:04
7:06
#9135
Half
13.11 mi12:00:461:34:247:124:43
6:55
#8996
25K
15.53 mi12:18:041:51:427:1117:18
7:08
#8599
30K
18.64 mi12:40:442:14:227:1222:40
7:18
#8090
20M
20.00 mi12:50:272:24:057:129:43
7:09
#7774
21M
21.00 mi12:57:442:31:227:127:17
7:17
#7432
35K
21.75 mi13:02:412:36:197:114:57
6:37
#7237
23M
23.00 mi13:11:172:44:557:108:36
6:52
#6913
24M
24.00 mi13:17:542:51:327:096:37
6:37
#6603
40K
24.85 mi13:23:322:57:107:085:38
6:35
#6368
25.2M
25.20 mi13:26:012:59:397:082:29
7:12
#6275
Finish
26.22 mi13:32:213:05:597:066:20
6:13
#5979
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi12014280228028505(Top 30%)1229(Top 10%)1229(Top 22%)
10K6.21 mi3.10 mi10501+15132049+7532049+7539214(Top 32%)1463(Top 12%)1463(Top 27%)
15K9.32 mi3.11 mi9796+7051740+3091740+3098505(Top 30%)1229(Top 10%)1229(Top 22%)
20K12.43 mi3.11 mi9135+6611473+2671473+2677533(Top 27%)939(Top 8%)939(Top 17%)
Half13.11 mi0.68 mi8996+1391415+581415+587051(Top 25%)776(Top 6%)776(Top 14%)
25K15.53 mi2.42 mi8599+3971277+1381277+1387197(Top 25%)921(Top 8%)921(Top 17%)
30K18.64 mi3.11 mi8090+5091149+1281149+1286436(Top 23%)806(Top 7%)806(Top 15%)
20M20.00 mi1.36 mi7774+3161051+981051+984957(Top 17%)496(Top 4%)496(Top 9%)
21M21.00 mi1.00 mi7432+342970+81970+813582(Top 13%)298(Top 2%)298(Top 5%)
35K21.75 mi0.75 mi7237+195924+46924+463099(Top 11%)248(Top 2%)248(Top 5%)
23M23.00 mi1.25 mi6913+324855+69855+693088(Top 11%)261(Top 2%)261(Top 5%)
24M24.00 mi1.00 mi6603+310795+60795+602606(Top 9%)207(Top 2%)207(Top 4%)
40K24.85 mi0.85 mi6368+235745+50745+501963(Top 7%)147(Top 1%)147(Top 3%)
25.2M25.20 mi0.35 mi6275+93727+18727+182235(Top 8%)228(Top 2%)228(Top 4%)
Finish26.22 mi1.02 mi5979+296662+65662+651594(Top 6%)109(Top 0.9%)109(Top 2%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 30%
×21stories
+97ft-345ft

Overall

8505

Females

1229

F18-39

1229

5K→10K

3.1 - 6.2 mi

Top 32%
×5stories
+79ft-138ft

Overall

9214

Females

1463

F18-39

1463

10K→15K

6.2 - 9.3 mi

Top 30%
×3stories
+67ft-78ft

Overall

8505

Females

1229

F18-39

1229

15K→20K

9.3 - 12.4 mi

Top 27%
×5stories
+106ft-86ft

Overall

7533

Females

939

F18-39

939

20K→Half

12.4 - 13.1 mi

Top 25%
×2stories
+19ft-37ft

Overall

7051

Females

776

F18-39

776

Half→25K

13.1 - 15.5 mi

Top 25%
×4stories
+66ft-88ft

Overall

7197

Females

921

F18-39

921

25K→30K

15.5 - 18.6 mi

Top 23%
×9stories
+181ft-148ft

Overall

6436

Females

806

F18-39

806

30K→20M

18.6 - 20.0 mi

Top 17%
×5stories
+64ft-50ft

Overall

4957

Females

496

F18-39

496

20M→21M

20.0 - 21.0 mi

Top 13%
×8stories
+106ft-24ft

Overall

3582

Females

298

F18-39

298

21M→35K

21.0 - 21.8 mi

Top 11%
×7stories
+17ft-86ft

Overall

3099

Females

248

F18-39

248

35K→23M

21.8 - 23.0 mi

Top 11%
×5stories
+23ft-63ft

Overall

3088

Females

261

F18-39

261

23M→24M

23.0 - 24.0 mi

Top 9%
×6stories
+12ft-82ft

Overall

2606

Females

207

F18-39

207

24M→40K

24.0 - 24.9 mi

Top 7%
×1story
+6ft-20ft

Overall

1963

Females

147

F18-39

147

40K→25.2M

24.9 - 25.2 mi

Top 8%
×1story
+13ft-16ft

Overall

2235

Females

228

F18-39

228

25.2M→Finish

25.2 - 26.2 mi

Top 6%
×2stories
+22ft-21ft

Overall

1594

Females

109

F18-39

109

Passing Analysis

Category:
Athletes Passed
6083*
Passed By
48
Net Change
+6035
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#12014
5K → 10K152512+1513#12014#10501
10K → 15K710*5+705#10501#9796
15K → 20K6654+661#9796#9135
20K → Half1412+139#9135#8996
Half → 25K4069+397#8996#8599
25K → 30K52112+509#8599#8090
30K → 20M3160+316#8090#7774
20M → 21M3420+342#7774#7432
21M → 35K1950+195#7432#7237
35K → 23M3251+324#7237#6913
23M → 24M3111+310#6913#6603
24M → 40K2350+235#6603#6368
40K → 25.2M952+93#6368#6275
25.2M → Finish2960+296#6275#5979
TOTALS6083*48+6035

* Includes athletes who did not complete a segment (DNF/DNQ).

📊

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