Conversion Rates From HM to Marathon

It's that time of year!  Rather than use calculators I thought it would be useful to conduct a survey of runners here with regards to their conversion between a half marathon and marathon.  If you feel like participating, a few ground rules:

1)  Include your marathon time and best half marathon time in the 16 weeks leading up to the marathon day in chronological order.

2)  Include as many of these combinations as you can come up with (i.e don't just include your best / last etc).  The more data the better.

3)  Male or female?

4)  Only include raced times - i.e. don't include a HM you ran at marathon pace and don't include a marathon where you were dressed like a ball bag.

5)  We'll manage the outliers later - I'm not interested in excuses as to why your marathon was slow (e.g. weather, first time etc) just record it. 

As an example:

Paula Radcliffe - Female

2009; HM - 69:45, Mar - 2:29:27

2007; HM - 67:53, Mar - 2:23:09.

If there's enough interest I'll collate and distribute the results.

Curly 45 open age female (I think you left out age but actually I think its important)

2009: HM 1:56:11 Mar: 4:31:06

Happy to be an outlier 

SOYCD female 29

2010 HM 2:02:30 Mar 4:59:51

Reallly hoping for a better HM to marathon conversion this year but won't know til the 10th April.

Male, 38

2007 HM 1.38, Mar 3.42

Dave Birch - Male - age 56

1987 HM 1:19:45  Mar  3:01:01

1989 HM 1:18:58  Mar 2:52:56

1990 HM 1:15:56 Mar - DNF - (ran moronically too fast from gun)

1991 HM 1:18:22  Mar 2:46:00 (PB - watch time, official time 2:46:27 - see Avatar)

1992 HM 1:17:33 Mar 2:51:02

1993 HM 1:19:15  Mar 2:51:23

1994 HM 1:18:27  Mar  2:49:05

1995 HM 1:18:43  Mar  2:53:54

1997 HM 1:22:58  Mar 2:53:19

1999 HM 1:23:47  Mar 2:56:57

2000 HM 1:22:11  Mar  2:57:40

2001 HM  1:24:20 Mar  2:57:50

2002 HM  1:22:58 Mar  2:57:19

2004 HM 1:27:42 Mar  3:07:10

2005 HM  1:25:08  Mar - DNS (left my gear - timing chip,shoes, the lot on F**king train at Blackheath)!! 

2006 HM 1:29:31  Mar 3:10:20

2008 & 2010 no HM, but maras 3:15:50 & 3:17:46 in April.   August 2010 HM of 1:31:19.

Good thread, Moraghan - be v. interested to see results/conclusions.

Female, was 29

HM 2.04, FM 4.34

Male, 36

2010 HM 2:03, Mar 5:03.

I'm also hoping for a better result on 10th April (Lochaber, crazy diamond?)

Good idea!

All as Senior Man these: 

Spring 2008 - Half 1'42'30. Full 3'38'06
Autumn 2008 - Half 1'38'xx. Full 3'39'xx

Spring 2009 - Half 1'27'47. Full 3'12'24

Spring 2010 - Half 1'21'12. Full 2'57'24

female 44

spring 2006   HM  1:58   FM   4:34

spring 2008  HM  1:56  FM    4:31

spring   2010  no HM    FM     4:26

Male.  Was 35

2005; HM 1:37; M 3:57

I should probably let people know the slower times too!

GFB - 46

HM: 2:32 FM 5:13

Female - 39

2007 - HM - 1.39   FM - 3.32

2008 - HM - 1.37.30  FM - 3.30

2009 - HM - 1.34    FM - 3.36 (Super Six Year - Ha Ha)

2010 - HM - 1.40 (only race, training run)  FM 3.27

Female V40

2005 - HM 89:49 Mar 3:06.38 (hilly HM, flat Mar)

2006 - HM - 84:15 Mar 2:56.02 (flat HM, flat Mar)

2007 - HM - 87:24 MarMT (multi terrain) 3:12.46

Not done a HM before a marathon since then, but plenty of 20 milers

Another one on the slower end

Female 50

2008 - HM: 2:28  FM 5:20

Joolska, female, under 35

2004 - HM: 1.34 - FM: 3.28
2006 - HM: 1.34 - FM: 3.23 (Spring)
2006 - HM: 1.34 - FM: 3.19 (Autumn)
2007 - HM: 1.27 - FM: 3.07 (Spring)
2007 - HM: 1.26 - FM: 3.05 (Autumn)

Missed 2005 and 2008 through injury.  Didn't do a flat-out half in 2009 or 2010 build ups.  And yes, I found half marathons pretty frustrating in 2004-2006.

RB - Male - 35

2010 - HM: 01:41:38 FM 04:00:00

I've had to delve into the archives to fine these - don't often do a measured half in marathon training, but...

female, was 34
2004 - HM 1.41  FM 3.41

female (still!) 41
2010 - HM 1.41, FM 3.36

(marathon pb is 3.31 and HM 1.36 but these weren't run in the same 16 week period).