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BOSTON MARATHON 2023

Tammy Chow

Bib: 15036•F

MA

0:00
0:00
/ mi
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Overall
#0 / 26622
Top 31%
Gender (Female)
#0 / 11423
Top 12%
Division (F18-39)
#0 / 4884
Top 22%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
23:23
Rank: #9862
Start → 5K
23:23 | 7:32/mi
10K· 6.21 mi
46:56
Rank: #10504 (-642)
5K → 10K
23:33 | 7:35/mi
15K· 9.32 mi
1:10:19
Rank: #10445 (+59)
10K → 15K
23:23 | 7:32/mi
20K· 12.43 mi
1:33:33
Rank: #10069 (+376)
15K → 20K
23:14 | 7:29/mi
Half· 13.11 mi
1:38:33
Rank: #9999
20K → Half
5:00 | 7:20/mi
25K· 15.53 mi
1:56:50
Rank: #9822
Half → 25K
18:17 | 7:32/mi
30K· 18.64 mi
2:20:22
Rank: #9394 (+428)
25K → 30K
23:32 | 7:34/mi
20M
2:30:34
Rank: #9179 (+215)
30K → 20M
10:12 | 7:30/mi
21M
2:38:26
Rank: #8990 (+189)
20M → 21M
7:52 | 7:52/mi
35K· 21.75 mi
2:43:53
Rank: #8909 (+81)
21M → 35K
5:27 | 7:17/mi
23M
2:53:22
Rank: #8773 (+136)
35K → 23M
9:29 | 7:34/mi
24M
3:00:35
Rank: #8598 (+175)
23M → 24M
7:13 | 7:13/mi
40K· 24.85 mi
3:06:55
Rank: #8473 (+125)
24M → 40K
6:20 | 7:24/mi
25.2M
3:09:38
Rank: #8407 (+66)
40K → 25.2M
2:43 | 7:53/mi
Finish· 26.22 mi
3:16:47
Rank: #8229 (+178)
25.2M → Finish
7:09 | 7:01/mi

The Course

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Half Splits

1st Half· via Half⚖️ Balanced
Distance13.11 mi
Time1:38:33
Pace7:31 /mi
2nd Half⚖️ Balanced
Distance13.11 mi
Time1:38:14
Pace7:30 /mi
📊Even Split: Consistent pacing between halves

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:53:2323:237:3223:23
7:32
-
10K
6.21 mi11:16:5646:567:3323:33
7:35
+0:03
15K
9.32 mi11:40:191:10:197:3323:23
7:32
-0:03
20K
12.43 mi12:03:331:33:337:3223:14
7:29
-0:03
Half
13.11 mi12:08:331:38:337:315:00
7:20
-0:09
25K
15.53 mi12:26:501:56:507:3118:17
7:32
+0:12
30K
18.64 mi12:50:222:20:227:3223:32
7:34
+0:02
20M
20.00 mi13:00:342:30:347:3210:12
7:30
-0:04
21M
21.00 mi13:08:262:38:267:337:52
7:52
+0:22
35K
21.75 mi13:13:532:43:537:325:27
7:17
-0:35
23M
23.00 mi13:23:222:53:227:329:29
7:34
+0:17
24M
24.00 mi13:30:353:00:357:317:13
7:13
-0:21
40K
24.85 mi13:36:553:06:557:316:20
7:24
+0:11
25.2M
25.20 mi13:39:383:09:387:322:43
7:53
+0:29
Finish
26.22 mi13:46:473:16:477:317:09
7:01
-0:52

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

7:01 /mi

Average Pace

7:31 /mi

Slowest Pace

7:53 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:06:12

95% of race

Time at Steady Pace

10:35

5% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:30 /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 mi10:53:2323:237:3223:23
7:32
#9862
10K
6.21 mi11:16:5646:567:3323:33
7:35
#10504
15K
9.32 mi11:40:191:10:197:3323:23
7:32
#10445
20K
12.43 mi12:03:331:33:337:3223:14
7:29
#10069
Half
13.11 mi12:08:331:38:337:315:00
7:20
#9999
25K
15.53 mi12:26:501:56:507:3118:17
7:32
#9822
30K
18.64 mi12:50:222:20:227:3223:32
7:34
#9394
20M
20.00 mi13:00:342:30:347:3210:12
7:30
#9179
21M
21.00 mi13:08:262:38:267:337:52
7:52
#8990
35K
21.75 mi13:13:532:43:537:325:27
7:17
#8909
23M
23.00 mi13:23:222:53:227:329:29
7:34
#8773
24M
24.00 mi13:30:353:00:357:317:13
7:13
#8598
40K
24.85 mi13:36:553:06:557:316:20
7:24
#8473
25.2M
25.20 mi13:39:383:09:387:322:43
7:53
#8407
Finish
26.22 mi13:46:473:16:477:317:09
7:01
#8229
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi98621788178810392(Top 39%)2019(Top 18%)2019(Top 41%)
10K6.21 mi3.10 mi10504-6422072-2842072-28411137(Top 42%)2388(Top 21%)2388(Top 49%)
15K9.32 mi3.11 mi10445+592036+362036+3610392(Top 39%)2019(Top 18%)2019(Top 41%)
20K12.43 mi3.11 mi10069+3761864+1721864+1729155(Top 34%)1547(Top 14%)1547(Top 32%)
Half13.11 mi0.68 mi9999+701832+321832+328875(Top 33%)1425(Top 12%)1425(Top 29%)
25K15.53 mi2.42 mi9822+1771774+581774+589090(Top 34%)1583(Top 14%)1583(Top 32%)
30K18.64 mi3.11 mi9394+4281648+1261648+1267773(Top 29%)1209(Top 11%)1209(Top 25%)
20M20.00 mi1.36 mi9179+2151576+721576+726852(Top 26%)977(Top 9%)977(Top 20%)
21M21.00 mi1.00 mi8990+1891530+461530+466579(Top 25%)976(Top 9%)976(Top 20%)
35K21.75 mi0.75 mi8909+811499+311499+317079(Top 27%)1132(Top 10%)1132(Top 23%)
23M23.00 mi1.25 mi8773+1361476+231476+236942(Top 26%)1154(Top 10%)1154(Top 24%)
24M24.00 mi1.00 mi8598+1751425+511425+515876(Top 22%)856(Top 7%)856(Top 18%)
40K24.85 mi0.85 mi8473+1251401+241401+246181(Top 23%)1054(Top 9%)1054(Top 22%)
25.2M25.20 mi0.35 mi8407+661385+161385+165890(Top 22%)1021(Top 9%)1021(Top 21%)
Finish26.22 mi1.02 mi8229+1781344+411344+415350(Top 20%)849(Top 7%)849(Top 17%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 39%
×21stories
+97ft-345ft

Overall

10392

Females

2019

F18-39

2019

5K→10K

3.1 - 6.2 mi

Top 42%
×5stories
+79ft-138ft

Overall

11137

Females

2388

F18-39

2388

10K→15K

6.2 - 9.3 mi

Top 39%
×3stories
+67ft-78ft

Overall

10392

Females

2019

F18-39

2019

15K→20K

9.3 - 12.4 mi

Top 34%
×5stories
+106ft-86ft

Overall

9155

Females

1547

F18-39

1547

20K→Half

12.4 - 13.1 mi

Top 33%
×2stories
+19ft-37ft

Overall

8875

Females

1425

F18-39

1425

Half→25K

13.1 - 15.5 mi

Top 34%
×4stories
+66ft-88ft

Overall

9090

Females

1583

F18-39

1583

25K→30K

15.5 - 18.6 mi

Top 29%
×9stories
+181ft-148ft

Overall

7773

Females

1209

F18-39

1209

30K→20M

18.6 - 20.0 mi

Top 26%
×5stories
+64ft-50ft

Overall

6852

Females

977

F18-39

977

20M→21M

20.0 - 21.0 mi

Top 25%
×8stories
+106ft-24ft

Overall

6579

Females

976

F18-39

976

21M→35K

21.0 - 21.8 mi

Top 27%
×7stories
+17ft-86ft

Overall

7079

Females

1132

F18-39

1132

35K→23M

21.8 - 23.0 mi

Top 26%
×5stories
+23ft-63ft

Overall

6942

Females

1154

F18-39

1154

23M→24M

23.0 - 24.0 mi

Top 22%
×6stories
+12ft-82ft

Overall

5876

Females

856

F18-39

856

24M→40K

24.0 - 24.9 mi

Top 23%
×1story
+6ft-20ft

Overall

6181

Females

1054

F18-39

1054

40K→25.2M

24.9 - 25.2 mi

Top 22%
×1story
+13ft-16ft

Overall

5890

Females

1021

F18-39

1021

25.2M→Finish

25.2 - 26.2 mi

Top 20%
×2stories
+22ft-21ft

Overall

5350

Females

849

F18-39

849

Passing Analysis

Category:
Athletes Passed
2392*
Passed By
1005
Net Change
+1386
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#9862
5K → 10K95736-642#9862#10504
10K → 15K235176+59#10504#10445
15K → 20K396*20+376#10445#10069
25K → 30K443*15+428#9822#9394
30K → 20M2216+215#9394#9179
20M → 21M1989+189#9179#8990
21M → 35K887+81#8990#8909
35K → 23M15014+136#8909#8773
23M → 24M1805+175#8773#8598
24M → 40K1349+125#8598#8473
40K → 25.2M671+66#8473#8407
25.2M → Finish1857+178#8407#8229
TOTALS2392*1005+1386

* 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