Runworks
Welcome, Guest      Blog      Forums      Calculator
     Log in  


Some links below may be affiliate links. BMOW may get paid if you buy something or take an action after clicking one of these.

As an Amazon Associate BMOW earns from qualifying purchases.
 
Return to topic list
 
<< Kaiser Permanente Half Marathon Race Rep... Training results: 1/31-2/6 >>
 converting half-marathon to marathon times
Rickshaw
Runworks 2005 5M Racer
San Francisco, CA
Joined: 26 Nov 2004
Posts: 1157
converting half-marathon to marathon times Posted: Tue Feb 08, 2005 10:57 am 
I've read various rules of thumb on how to convert half-marathon times to equivalent marathon times. The most common one seems to be to double your half-marathon time, and add 10 minutes. That might be a bit too conservative, though. Examining the equivalency tables from Daniels Running Formula, it looks like double plus 7 or 8 minutes is about what he expects. On the other hand, I've seen running calculators that suggest something more like double plus 12 to 15 minutes.

For those that have run a half-marathon and a marathon within a fairly short period, how did your times compare? Obviously there are a lot of other factors to consider, such as the difficulty of the courses involved, weather, etc. But for a reasonable large sample of people, looking at half marathons and marathons done within a couple of months of each other, I think you'd be able to extract a meaningful average.

The only data point I can provide is from 2003, when I ran a half marathon in 1:37:59, followed three weeks later by a 3:23:02 marathon. That works out to double + 7:04. Anyone else have a result to share, or a general theory on this?
Bricks
Runworks 2005 5M Racer
Chicago
Joined: 09 Dec 2004
Posts: 222
Re: converting half-marathon to marathon times Posted: Tue Feb 08, 2005 1:49 pm 
Hmm... Is someone trying to figure out if his recent strong half marathon time can predict an impending BQ? (Personally, I think you're right where you want to be)

For discussion's sake I ran my second ever half marathon August 1, 2004 in 1:43:15 and the subsequent full October 10 in 3:37:13. So double + 10:43 if my math serves, but I was all over the place in my first year of training and racing so I suspect I'm not the best gauge.
ginger

Cambridge, MA
Joined: 08 Dec 2004
Posts: 46
Re: converting half-marathon to marathon times Posted: Tue Feb 08, 2005 4:57 pm 
Good question -- I'd like to know how to predict as well. In general the Jack Daniels table has been accurate for predicting race times for me, within a margin of error of about 1 "vdot".

For some more numbers, I ran a 2:59 full in early December at CIM, then a 1:23 half nine weeks later at the kaiser SF half. So that would be double + 13 mins. But maybe I'm in better running shape now than I was then...
Rickshaw
Runworks 2005 5M Racer
San Francisco, CA
Joined: 26 Nov 2004
Posts: 1157
Re: converting half-marathon to marathon times Posted: Tue Feb 08, 2005 6:00 pm 
These numbers are all in the same general range, so that's good. I suspect double + 7 is about right assuming the right training, but double + 10 or 15 may not be uncommon for anyone who hits the wall, or has a poorly paced marathon. Or maybe in Ginger's case, gets in a lot of good training between the full and the half.

If you look at the VDOT tables, you'll see they are all roughly double + 7.5.
View posts:     


All times are GMT - 8 Hours
Page 1 of 1
 

Copyright © 2014 Runworks. All rights reserved.   Powered by phpBB © phpBB Group

Questions or Comments  Privacy Policy