4k to 5k Conversion

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4k to 5k Conversion

Postby jmcooklj on Thu Oct 06, 2011 9:12 am

I am making an "all-time" best list for my girls xc team. Of course, there are 4k and 5k times on the list and I would like to convert the 4ks to 5ks so I can have a compiled list for everyone. I am looking for an "official" way to convert times so it is fair for both the 4k and 5k girls. I have heard of the 4 and 5 second rule, where you add 4 seconds per 400 further for boys and 5 for girls. So that means for the girls, convert the pace to a 5k (*5/4) then add 12.5 seconds. Anyone have any other ideas?
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Re: 4k to 5k Conversion

Postby luv2run on Thu Oct 06, 2011 9:37 am

try the mcmillan race pace calculator online, you can put any distance in there, and it will convert to any other distance.
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Re: 4k to 5k Conversion

Postby Drake on Thu Oct 06, 2011 10:34 am

There is no conversion for a 4k to a 5k. Its too great a distance to assume someone could keep the same or a similar pace. I would just make two seperate lists...
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Re: 4k to 5k Conversion

Postby runner1727 on Thu Oct 06, 2011 11:24 am

FootPursuit wrote:There is no conversion for a 4k to a 5k. Its too great a distance to assume someone could keep the same or a similar pace. I would just make two seperate lists...

I agree
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Re: 4k to 5k Conversion

Postby jmcooklj on Thu Oct 06, 2011 1:01 pm

This will be an unofficial list I am coming up with. This isn't for records or anything like that. I will keep all of the official 4k times. I simply wanted to know a fair way to compare them, if there is one. I was thinking a top 20 4k, top 20 5k, then a compiled 5k/converted4k top 20. I was hoping for a generally accepted conversion, but it seems there isn't one.
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Re: 4k to 5k Conversion

Postby runrman on Thu Oct 06, 2011 2:05 pm

runworks.com has a conversion/pace calculator based on Daniels' tables.
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Re: 4k to 5k Conversion

Postby DeadManRuning on Thu Oct 06, 2011 7:09 pm

From this website:
http://www.inccstats.com/permanent/explanation.html

The conversion is done by multiplying the 4k times by 1.2725, which is the average conversion factor that I found on multiple online calculators, and appears to be reasonable.
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Re: 4k to 5k Conversion

Postby Nike_Guy on Fri Oct 07, 2011 8:34 pm

Here's the conversion formula:

T2 = T1* (D1 / D2) ^ 1.06

Example: Convert from 4K to 5K for someone who ran 15:30.

Step 1: Convert the 4K time into minutes or seconds. 15 + 30/60 = 15.5 minutes.

Step 2: Plug & Chug

5K time = 15.5 * (5000/4000)^1.06

5K time = 19.63 minutes or 19:38

You can use this formula for distances that are reasonably close, i.e. 4K to 5K. However, you can't use it to project big differences in distance, e.g. 5K to 1/2 marathon.

I used this same formula to convert my the times to 5K efforts from my old high school team pre-1980 when the distance was only 2 1/2 miles. The result was a physical confrontation with an overly zealous parent. He didn't like the fact that his kid wasn't nearly as good as he thought he was.

Let's just say my team would have had 7 guys sub-17:00. :^)
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