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BOSTON MARATHON 2025

William Kalbacker

Bib: 3654•M

NY

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 10%
Gender (Male)
#0 / 16105
Top 17%
Division (M18-39)
#0 / 5642
Top 38%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
19:55
Rank: #3192
Start → 5K
19:55 | 6:25/mi
10K· 6.21 mi
39:46
Rank: #3059 (+133)
5K → 10K
19:51 | 6:23/mi
15K· 9.32 mi
59:34
Rank: #2938 (+121)
10K → 15K
19:48 | 6:22/mi
20K· 12.43 mi
1:19:25
Rank: #2793 (+145)
15K → 20K
19:51 | 6:23/mi
Half· 13.11 mi
1:23:46
Rank: #2804 (-11)
20K → Half
4:21 | 6:23/mi
25K· 15.53 mi
1:39:21
Rank: #2713 (+91)
Half → 25K
15:35 | 6:26/mi
30K· 18.64 mi
1:59:46
Rank: #2581 (+132)
25K → 30K
20:25 | 6:34/mi
20M
2:08:52
Rank: #2528 (+53)
30K → 20M
9:06 | 6:42/mi
21M
2:15:51
Rank: #2490 (+38)
20M → 21M
6:59 | 6:59/mi
35K· 21.75 mi
2:21:09
Rank: #2588 (-98)
21M → 35K
5:18 | 7:05/mi
23M
2:30:29
Rank: #2760 (-172)
35K → 23M
9:20 | 7:27/mi
24M
2:37:49
Rank: #2851 (-91)
23M → 24M
7:20 | 7:20/mi
40K· 24.85 mi
2:43:55
Rank: #2890 (-39)
24M → 40K
6:06 | 7:08/mi
25.2M
2:46:32
Rank: #2883 (+7)
40K → 25.2M
2:37 | 7:35/mi
Finish· 26.22 mi
2:53:09
Rank: #2840 (+43)
25.2M → Finish
6:37 | 6:30/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:23:46
Pace6:23 /mi
2nd Half
Distance13.11 mi
Time1:29:23
Pace6:49 /mi
📊Positive Split: 6.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:22:2619:556:2519:55
6:25
-
10K
6.21 mi10:42:1739:466:2419:51
6:23
-0:02
15K
9.32 mi11:02:0559:346:2319:48
6:22
-0:01
20K
12.43 mi11:21:561:19:256:2319:51
6:23
+0:01
Half
13.11 mi11:26:171:23:466:234:21
6:23
0:00
25K
15.53 mi11:41:521:39:216:2415:35
6:26
+0:03
30K
18.64 mi12:02:171:59:466:2520:25
6:34
+0:08
20M
20.00 mi12:11:232:08:526:279:06
6:42
+0:08
21M
21.00 mi12:18:222:15:516:286:59
6:59
+0:17
35K
21.75 mi12:23:402:21:096:295:18
7:05
+0:06
23M
23.00 mi12:33:002:30:296:339:20
7:27
+0:22
24M
24.00 mi12:40:202:37:496:357:20
7:20
-0:07
40K
24.85 mi12:46:262:43:556:366:06
7:08
-0:12
25.2M
25.20 mi12:49:032:46:326:372:37
7:35
+0:27
Finish
26.22 mi12:55:402:53:096:376:37
6:30
-1:05

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

6:22 /mi

Average Pace

6:37 /mi

Slowest Pace

7:35 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:22:28

82% of race

Time at Steady Pace

28:04

16% of race

Time at Slower Pace

2:37

2% of race

Average Pace: 6:36 /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 mi10:22:2619:556:2519:55
6:25
#3192
10K
6.21 mi10:42:1739:466:2419:51
6:23
#3059
15K
9.32 mi11:02:0559:346:2319:48
6:22
#2938
20K
12.43 mi11:21:561:19:256:2319:51
6:23
#2793
Half
13.11 mi11:26:171:23:466:234:21
6:23
#2804
25K
15.53 mi11:41:521:39:216:2415:35
6:26
#2713
30K
18.64 mi12:02:171:59:466:2520:25
6:34
#2581
20M
20.00 mi12:11:232:08:526:279:06
6:42
#2528
21M
21.00 mi12:18:222:15:516:286:59
6:59
#2490
35K
21.75 mi12:23:402:21:096:295:18
7:05
#2588
23M
23.00 mi12:33:002:30:296:339:20
7:27
#2760
24M
24.00 mi12:40:202:37:496:357:20
7:20
#2851
40K
24.85 mi12:46:262:43:556:366:06
7:08
#2890
25.2M
25.20 mi12:49:032:46:326:372:37
7:35
#2883
Finish
26.22 mi12:55:402:53:096:376:37
6:30
#2840
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi3192303230322765(Top 10%)2632(Top 16%)2632(Top 47%)
10K6.21 mi3.10 mi3059+1332909+1232909+1232961(Top 10%)2819(Top 18%)2819(Top 50%)
15K9.32 mi3.11 mi2938+1212799+1102799+1102765(Top 10%)2632(Top 16%)2632(Top 47%)
20K12.43 mi3.11 mi2793+1452663+1362663+1362464(Top 9%)2349(Top 15%)2349(Top 42%)
Half13.11 mi0.68 mi2804-112674-112674-112899(Top 10%)2766(Top 17%)2766(Top 49%)
25K15.53 mi2.42 mi2713+912589+852589+852495(Top 9%)2373(Top 15%)2373(Top 42%)
30K18.64 mi3.11 mi2581+1322465+1242465+1242285(Top 8%)2164(Top 13%)2164(Top 38%)
20M20.00 mi1.36 mi2528+532412+532412+532439(Top 9%)2300(Top 14%)2300(Top 41%)
21M21.00 mi1.00 mi2490+382375+372375+372191(Top 8%)2047(Top 13%)2047(Top 36%)
35K21.75 mi0.75 mi2588-982464-892464-895847(Top 21%)4946(Top 31%)4946(Top 88%)
23M23.00 mi1.25 mi2760-1722620-1562620-1566339(Top 22%)5170(Top 32%)5170(Top 92%)
24M24.00 mi1.00 mi2851-912699-792699-796557(Top 23%)5251(Top 33%)5251(Top 93%)
40K24.85 mi0.85 mi2890-392733-342733-344626(Top 16%)3931(Top 24%)3931(Top 70%)
25.2M25.20 mi0.35 mi2883+72728+52728+53737(Top 13%)3219(Top 20%)3219(Top 57%)
Finish26.22 mi1.02 mi2840+432687+412687+412771(Top 10%)2478(Top 15%)2478(Top 44%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 10%
×21stories
+97ft-345ft

Overall

2765

Males

2632

M18-39

2632

5K→10K

3.1 - 6.2 mi

Top 10%
×5stories
+79ft-138ft

Overall

2961

Males

2819

M18-39

2819

10K→15K

6.2 - 9.3 mi

Top 10%
×3stories
+67ft-78ft

Overall

2765

Males

2632

M18-39

2632

15K→20K

9.3 - 12.4 mi

Top 9%
×5stories
+106ft-86ft

Overall

2464

Males

2349

M18-39

2349

20K→Half

12.4 - 13.1 mi

Top 10%
×2stories
+19ft-37ft

Overall

2899

Males

2766

M18-39

2766

Half→25K

13.1 - 15.5 mi

Top 9%
×4stories
+66ft-88ft

Overall

2495

Males

2373

M18-39

2373

25K→30K

15.5 - 18.6 mi

Top 8%
×9stories
+181ft-148ft

Overall

2285

Males

2164

M18-39

2164

30K→20M

18.6 - 20.0 mi

Top 9%
×5stories
+64ft-50ft

Overall

2439

Males

2300

M18-39

2300

20M→21M

20.0 - 21.0 mi

Top 8%
×8stories
+106ft-24ft

Overall

2191

Males

2047

M18-39

2047

21M→35K

21.0 - 21.8 mi

Top 21%
×7stories
+17ft-86ft

Overall

5847

Males

4946

M18-39

4946

35K→23M

21.8 - 23.0 mi

Top 22%
×5stories
+23ft-63ft

Overall

6339

Males

5170

M18-39

5170

23M→24M

23.0 - 24.0 mi

Top 23%
×6stories
+12ft-82ft

Overall

6557

Males

5251

M18-39

5251

24M→40K

24.0 - 24.9 mi

Top 16%
×1story
+6ft-20ft

Overall

4626

Males

3931

M18-39

3931

40K→25.2M

24.9 - 25.2 mi

Top 13%
×1story
+13ft-16ft

Overall

3737

Males

3219

M18-39

3219

25.2M→Finish

25.2 - 26.2 mi

Top 10%
×2stories
+22ft-21ft

Overall

2771

Males

2478

M18-39

2478

Passing Analysis

Category:
Athletes Passed
1117
Passed By
765
Net Change
+352
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#3192
5K → 10K20875+133#3192#3059
10K → 15K16140+121#3059#2938
15K → 20K16116+145#2938#2793
20K → Half819-11#2793#2804
Half → 25K11726+91#2804#2713
25K → 30K16028+132#2713#2581
30K → 20M7623+53#2581#2528
20M → 21M6325+38#2528#2490
21M → 35K13111-98#2490#2588
35K → 23M25197-172#2588#2760
23M → 24M18109-91#2760#2851
24M → 40K3069-39#2851#2890
40K → 25.2M2013+7#2890#2883
25.2M → Finish5714+43#2883#2840
TOTALS1117765+352
📊

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