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BOSTON MARATHON 2025

Lachlan Arthur

Bib: 2677•M

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 10%
Gender (Male)
#0 / 16105
Top 16%
Division (M18-39)
#0 / 5642
Top 37%
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
6:26/mi
19:59
↑ 97↓ 3451.5%
10K· 6.21 mi
6:24/mi
39:53
↑ 79↓ 1380.4%
15K· 9.32 mi
6:24/mi
59:45
↑ 67↓ 78
20K· 12.43 mi
6:28/mi
1:19:49
↑ 106↓ 860.1%
Half· 13.11 mi
6:25/mi
1:24:12
↑ 19↓ 370.5%
25K· 15.53 mi
6:29/mi
1:39:54
↑ 66↓ 880.2%
30K· 18.64 mi
6:36/mi
2:00:25
↑ 181↓ 1480.2%
20M
6:44/mi
2:09:34
↑ 64↓ 500.2%
21M
7:02/mi
2:16:36
↑ 106↓ 241.6%
35K· 21.75 mi
6:41/mi
2:21:36
↑ 17↓ 861.7%
23M
6:56/mi
2:30:17
↑ 23↓ 630.6%
24M
6:54/mi
2:37:11
↓ 821.3%
40K· 24.85 mi
7:03/mi
2:43:13
↓ 200.3%
25.2M
7:32/mi
2:45:49
↑ 13↓ 160.2%
Finish· 26.22 mi
6:55/mi
2:52:52
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:24:12
Pace6:25 /mi
2nd Half
Distance13.11 mi
Time1:28:40
Pace6:46 /mi
📊Positive Split: 5.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:21:3719:596:2619:59
6:26
-
10K
6.21 mi10:41:3139:536:2519:54
6:24
-0:02
15K
9.32 mi11:01:2359:456:2519:52
6:24
0:00
20K
12.43 mi11:21:271:19:496:2520:04
6:28
+0:04
Half
13.11 mi11:25:501:24:126:254:23
6:25
-0:03
25K
15.53 mi11:41:321:39:546:2615:42
6:29
+0:04
30K
18.64 mi12:02:032:00:256:2820:31
6:36
+0:07
20M
20.00 mi12:11:122:09:346:299:09
6:44
+0:08
21M
21.00 mi12:18:142:16:366:307:02
7:02
+0:18
35K
21.75 mi12:23:142:21:366:315:00
6:41
-0:21
23M
23.00 mi12:31:552:30:176:328:41
6:56
+0:15
24M
24.00 mi12:38:492:37:116:336:54
6:54
-0:02
40K
24.85 mi12:44:512:43:136:346:02
7:03
+0:09
25.2M
25.20 mi12:47:272:45:496:352:36
7:32
+0:29
Finish
26.22 mi12:54:302:52:526:367:03
6:55
-0:37

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

6:24 /mi

Average Pace

6:36 /mi

Slowest Pace

7:32 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:44:14

95% of race

Time at Steady Pace

8:38

5% of race

Time at Slower Pace

0:00

0% 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 mi10:21:3719:596:2619:59
6:26
#3325
10K
6.21 mi10:41:3139:536:2519:54
6:24
#3183
15K
9.32 mi11:01:2359:456:2519:52
6:24
#3073
20K
12.43 mi11:21:271:19:496:2520:04
6:28
#2997
Half
13.11 mi11:25:501:24:126:254:23
6:25
#3009
25K
15.53 mi11:41:321:39:546:2615:42
6:29
#2935
30K
18.64 mi12:02:032:00:256:2820:31
6:36
#2781
20M
20.00 mi12:11:122:09:346:299:09
6:44
#2750
21M
21.00 mi12:18:142:16:366:307:02
7:02
#2700
35K
21.75 mi12:23:142:21:366:315:00
6:41
#2700
23M
23.00 mi12:31:552:30:176:328:41
6:56
#2708
24M
24.00 mi12:38:492:37:116:336:54
6:54
#2724
40K
24.85 mi12:44:512:43:136:346:02
7:03
#2737
25.2M
25.20 mi12:47:272:45:496:352:36
7:32
#2728
Finish
26.22 mi12:54:302:52:526:367:03
6:55
#2795
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi3325315731572897(Top 10%)2761(Top 17%)2761(Top 49%)
10K6.21 mi3.10 mi3183+1423027+1303027+1303066(Top 11%)2919(Top 18%)2919(Top 52%)
15K9.32 mi3.11 mi3073+1102926+1012926+1012897(Top 10%)2761(Top 17%)2761(Top 49%)
20K12.43 mi3.11 mi2997+762857+692857+692867(Top 10%)2730(Top 17%)2730(Top 48%)
Half13.11 mi0.68 mi3009-122868-112868-113162(Top 11%)3003(Top 19%)3003(Top 53%)
25K15.53 mi2.42 mi2935+742798+702798+702747(Top 10%)2614(Top 16%)2614(Top 46%)
30K18.64 mi3.11 mi2781+1542651+1472651+1472430(Top 9%)2300(Top 14%)2300(Top 41%)
20M20.00 mi1.36 mi2750+312620+312620+312600(Top 9%)2442(Top 15%)2442(Top 43%)
21M21.00 mi1.00 mi2700+502571+492571+492383(Top 8%)2224(Top 14%)2224(Top 39%)
35K21.75 mi0.75 mi27002569+22569+23357(Top 12%)3056(Top 19%)3056(Top 54%)
23M23.00 mi1.25 mi2708-82573-42573-43384(Top 12%)3072(Top 19%)3072(Top 54%)
24M24.00 mi1.00 mi2724-162582-92582-94041(Top 14%)3558(Top 22%)3558(Top 63%)
40K24.85 mi0.85 mi2737-132594-122594-124177(Top 15%)3614(Top 22%)3614(Top 64%)
25.2M25.20 mi0.35 mi2728+92583+112583+113511(Top 12%)3055(Top 19%)3055(Top 54%)
Finish26.22 mi1.02 mi2795-672645-622645-625167(Top 18%)4215(Top 26%)4215(Top 75%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 10%
×21story building
+97ft-345ft

Overall

2897

Males

2761

M18-39

2761

5K→10K

3.1 - 6.2 mi

Top 11%
×5story building
+79ft-138ft

Overall

3066

Males

2919

M18-39

2919

10K→15K

6.2 - 9.3 mi

Top 10%
×3story building
+67ft-78ft

Overall

2897

Males

2761

M18-39

2761

15K→20K

9.3 - 12.4 mi

Top 10%
×5story building
+106ft-86ft

Overall

2867

Males

2730

M18-39

2730

20K→Half

12.4 - 13.1 mi

Top 11%
×2story building
+19ft-37ft

Overall

3162

Males

3003

M18-39

3003

Half→25K

13.1 - 15.5 mi

Top 10%
×4story building
+66ft-88ft

Overall

2747

Males

2614

M18-39

2614

25K→30K

15.5 - 18.6 mi

Top 9%
×9story building
+181ft-148ft

Overall

2430

Males

2300

M18-39

2300

30K→20M

18.6 - 20.0 mi

Top 9%
×5story building
+64ft-50ft

Overall

2600

Males

2442

M18-39

2442

20M→21M

20.0 - 21.0 mi

Top 8%
×8story building
+106ft-24ft

Overall

2383

Males

2224

M18-39

2224

21M→35K

21.0 - 21.8 mi

Top 12%
×7story building
+17ft-86ft

Overall

3357

Males

3056

M18-39

3056

35K→23M

21.8 - 23.0 mi

Top 12%
×5story building
+23ft-63ft

Overall

3384

Males

3072

M18-39

3072

23M→24M

23.0 - 24.0 mi

Top 14%
×6story building
+12ft-82ft

Overall

4041

Males

3558

M18-39

3558

24M→40K

24.0 - 24.9 mi

Top 15%
×1story
+6ft-20ft

Overall

4177

Males

3614

M18-39

3614

40K→25.2M

24.9 - 25.2 mi

Top 12%
×1story
+13ft-16ft

Overall

3511

Males

3055

M18-39

3055

25.2M→Finish

25.2 - 26.2 mi

Top 18%
×2story building
+22ft-21ft

Overall

5167

Males

4215

M18-39

4215

Passing Analysis

Category:
Athletes Passed
1115
Passed By
585
Net Change
+530
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#3325
5K → 10K21169+142#3325#3183
10K → 15K14434+110#3183#3073
15K → 20K12044+76#3073#2997
20K → Half1123-12#2997#3009
Half → 25K10834+74#3009#2935
25K → 30K18834+154#2935#2781
30K → 20M6938+31#2781#2750
20M → 21M7626+50#2750#2700
21M → 35K25250#2700#2700
35K → 23M5361-8#2700#2708
23M → 24M3854-16#2708#2724
24M → 40K3346-13#2724#2737
40K → 25.2M2314+9#2737#2728
25.2M → Finish1683-67#2728#2795
TOTALS1115585+530
📊

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