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BOSTON MARATHON 2025

Brittney Sivo

Bib: 18412•F

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0:00
0:00
/ mi
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
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
8:32/mi
26:30
↑ 97↓ 3451.5%
10K· 6.21 mi
8:47/mi
53:48
↑ 79↓ 1380.4%
15K· 9.32 mi
8:59/mi
1:21:42
↑ 67↓ 78
20K· 12.43 mi
9:14/mi
1:50:22
↑ 106↓ 860.1%
Half· 13.11 mi
9:02/mi
1:56:32
↑ 19↓ 370.5%
25K· 15.53 mi
9:06/mi
2:18:37
↑ 66↓ 880.2%
30K· 18.64 mi
9:11/mi
2:47:10
↑ 181↓ 1480.2%
20M
9:18/mi
2:59:48
↑ 64↓ 500.2%
21M
9:14/mi
3:09:02
↑ 106↓ 241.6%
35K· 21.75 mi
8:48/mi
3:15:37
↑ 17↓ 861.7%
23M
8:57/mi
3:26:49
↑ 23↓ 630.6%
24M
8:41/mi
3:35:30
↓ 821.3%
40K· 24.85 mi
8:37/mi
3:42:52
↓ 200.3%
25.2M
9:08/mi
3:46:01
↑ 13↓ 160.2%
Finish· 26.22 mi
7:49/mi
3:53:59
↑ 22↓ 21

The Course

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Half Splits

1st Half· via Half⚖️ Balanced
Distance13.11 mi
Time1:56:32
Pace8:53 /mi
2nd Half⚖️ Balanced
Distance13.11 mi
Time1:57:27
Pace8:58 /mi
📊Even Split: Consistent pacing between halves

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:17:5726:308:3226:30
8:32
-
10K
6.21 mi11:45:1553:488:3927:18
8:47
+0:15
15K
9.32 mi12:13:091:21:428:4627:54
8:59
+0:12
20K
12.43 mi12:41:491:50:228:5328:40
9:14
+0:15
Half
13.11 mi12:47:591:56:328:536:10
9:02
-0:12
25K
15.53 mi13:10:042:18:378:5522:05
9:06
+0:04
30K
18.64 mi13:38:372:47:108:5828:33
9:11
+0:05
20M
20.00 mi13:51:152:59:488:5912:38
9:18
+0:07
21M
21.00 mi14:00:293:09:029:009:14
9:14
-0:04
35K
21.75 mi14:07:043:15:379:006:35
8:48
-0:26
23M
23.00 mi14:18:163:26:499:0011:12
8:57
+0:09
24M
24.00 mi14:26:573:35:308:598:41
8:41
-0:16
40K
24.85 mi14:34:193:42:528:587:22
8:37
-0:04
25.2M
25.20 mi14:37:283:46:018:583:09
9:08
+0:31
Finish
26.22 mi14:45:263:53:598:567:58
7:49
-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

7:49 /mi

Average Pace

8:56 /mi

Slowest Pace

9:18 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

34:28

15% of race

Time at Steady Pace

2:28:59

64% of race

Time at Slower Pace

50:32

22% of race

Average Pace: 8:55 /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 mi11:17:5726:308:3226:30
8:32
#20071
10K
6.21 mi11:45:1553:488:3927:18
8:47
#20698
15K
9.32 mi12:13:091:21:428:4627:54
8:59
#21068
20K
12.43 mi12:41:491:50:228:5328:40
9:14
#21337
Half
13.11 mi12:47:591:56:328:536:10
9:02
#21387
25K
15.53 mi13:10:042:18:378:5522:05
9:06
#21220
30K
18.64 mi13:38:372:47:108:5828:33
9:11
#20719
20M
20.00 mi13:51:152:59:488:5912:38
9:18
#20506
21M
21.00 mi14:00:293:09:029:009:14
9:14
#20212
35K
21.75 mi14:07:043:15:379:006:35
8:48
#20090
23M
23.00 mi14:18:163:26:499:0011:12
8:57
#19868
24M
24.00 mi14:26:573:35:308:598:41
8:41
#19689
40K
24.85 mi14:34:193:42:528:587:22
8:37
#19497
25.2M
25.20 mi14:37:283:46:018:583:09
9:08
#19398
Finish
26.22 mi14:45:263:53:598:567:58
7:49
#19140
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi200717537753721952(Top 77%)8519(Top 70%)8519(Top 156%)
10K6.21 mi3.10 mi20698-6277888-3517888-35121350(Top 75%)8223(Top 67%)8223(Top 150%)
15K9.32 mi3.11 mi21068-3708074-1868074-18621952(Top 77%)8519(Top 70%)8519(Top 156%)
20K12.43 mi3.11 mi21337-2698218-1448218-14421996(Top 77%)8577(Top 70%)8577(Top 157%)
Half13.11 mi0.68 mi21387-508253-358253-3521980(Top 77%)8585(Top 70%)8585(Top 157%)
25K15.53 mi2.42 mi21220+1678165+888165+8820391(Top 72%)7752(Top 63%)7752(Top 142%)
30K18.64 mi3.11 mi20719+5017936+2297936+22918608(Top 66%)6896(Top 56%)6896(Top 126%)
20M20.00 mi1.36 mi20506+2137833+1037833+10318300(Top 64%)6891(Top 56%)6891(Top 126%)
21M21.00 mi1.00 mi20212+2947702+1317702+13114861(Top 52%)5101(Top 42%)5101(Top 93%)
35K21.75 mi0.75 mi20090+1227646+567646+5617293(Top 61%)6528(Top 53%)6528(Top 119%)
23M23.00 mi1.25 mi19868+2227547+997547+9915992(Top 56%)5892(Top 48%)5892(Top 108%)
24M24.00 mi1.00 mi19689+1797472+757472+7515689(Top 55%)5755(Top 47%)5755(Top 105%)
40K24.85 mi0.85 mi19497+1927377+957377+9514208(Top 50%)5088(Top 42%)5088(Top 93%)
25.2M25.20 mi0.35 mi19398+997329+487329+4812695(Top 45%)4374(Top 36%)4374(Top 80%)
Finish26.22 mi1.02 mi19140+2587210+1197210+11911621(Top 41%)3774(Top 31%)3774(Top 69%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 77%
×21story building
+97ft-345ft

Overall

21952

Females

8519

F18-39

8519

5K→10K

3.1 - 6.2 mi

Top 75%
×5story building
+79ft-138ft

Overall

21350

Females

8223

F18-39

8223

10K→15K

6.2 - 9.3 mi

Top 77%
×3story building
+67ft-78ft

Overall

21952

Females

8519

F18-39

8519

15K→20K

9.3 - 12.4 mi

Top 77%
×5story building
+106ft-86ft

Overall

21996

Females

8577

F18-39

8577

20K→Half

12.4 - 13.1 mi

Top 77%
×2story building
+19ft-37ft

Overall

21980

Females

8585

F18-39

8585

Half→25K

13.1 - 15.5 mi

Top 72%
×4story building
+66ft-88ft

Overall

20391

Females

7752

F18-39

7752

25K→30K

15.5 - 18.6 mi

Top 66%
×9story building
+181ft-148ft

Overall

18608

Females

6896

F18-39

6896

30K→20M

18.6 - 20.0 mi

Top 64%
×5story building
+64ft-50ft

Overall

18300

Females

6891

F18-39

6891

20M→21M

20.0 - 21.0 mi

Top 52%
×8story building
+106ft-24ft

Overall

14861

Females

5101

F18-39

5101

21M→35K

21.0 - 21.8 mi

Top 61%
×7story building
+17ft-86ft

Overall

17293

Females

6528

F18-39

6528

35K→23M

21.8 - 23.0 mi

Top 56%
×5story building
+23ft-63ft

Overall

15992

Females

5892

F18-39

5892

23M→24M

23.0 - 24.0 mi

Top 55%
×6story building
+12ft-82ft

Overall

15689

Females

5755

F18-39

5755

24M→40K

24.0 - 24.9 mi

Top 50%
×1story
+6ft-20ft

Overall

14208

Females

5088

F18-39

5088

40K→25.2M

24.9 - 25.2 mi

Top 45%
×1story
+13ft-16ft

Overall

12695

Females

4374

F18-39

4374

25.2M→Finish

25.2 - 26.2 mi

Top 41%
×2story building
+22ft-21ft

Overall

11621

Females

3774

F18-39

3774

Passing Analysis

Category:
Athletes Passed
2690
Passed By
1759
Net Change
+931
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#20071
5K → 10K92719-627#20071#20698
10K → 15K92462-370#20698#21068
15K → 20K129398-269#21068#21337
20K → Half2070-50#21337#21387
Half → 25K22861+167#21387#21220
25K → 30K51413+501#21220#20719
30K → 20M22714+213#20719#20506
20M → 21M2995+294#20506#20212
21M → 35K1275+122#20212#20090
35K → 23M2308+222#20090#19868
23M → 24M1823+179#19868#19689
24M → 40K1931+192#19689#19497
40K → 25.2M990+99#19497#19398
25.2M → Finish2580+258#19398#19140
TOTALS26901759+931
📊

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