Metric conversion

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19/05/2003 at 16:29
Hi All

Can someone give me the aogorithm to convert min/mile into min/km please??

At present I

1. Convert miles to Km

2. Convert my time to in minutes into

3. Divide seconds by distance in Km.

4. Divide this answer by 60 to get min/Km


6.2 miles = 10K in 43:17

43 X 60 = 2580 + 17 = 2597 seconds.
2597 / 10 = 259.7 seconds /Km

259 / 60 = 4:19 min/Km approx

Is this correct or is there an easier way.

Please forgive the basic maths question but my schooling was done in the time of imperial measurements :)


19/05/2003 at 16:34
Don't you just need to know the ratio (1.6 or whatever it is) of miles: km? Mins & secs can easily be worked out as a percentage (or use the fraction button on the calculator) so I think only 2 sums need to be worked out.
19/05/2003 at 16:39
19/05/2003 at 16:39
minutes & seconds are a hassle on a calculator i agree.

either convert your time to seconds
i.e. 4:19 = (60*4) + 19 = 259secs/mile
or convert it to metric style
i.e. 4:19 = 4 + (19/60) = 4.317mins/mile

divide by 1.6 (miles->km)
161.9secs/km or 2.697 mins/km

and work back into whole minutes & seconds..

in a rush.. just realised i started with your example min/km time but the principle stands .. i think
19/05/2003 at 16:40
or yeah.. just do it online
19/05/2003 at 16:41

Easiest is on a spreadsheet. Problem is mixing decimal and hh:mm:ss units.

Cannot suggest easier way with a calculator only a different one

Convert seconds into decimal ie secs/60, 17/60 = 0.2833 and add minutes = 43.2833
divide by the km ie 43.2833/10 = 4.3283min/km.
Convert decimal back to secs by multiplying by 60 ie 0.3283 x 60 = 19.7
Result 4:19.7 min/km
19/05/2003 at 16:43
Hi Gavo

Thanks, but could you add an example please ??

ie. From above

6.2 miles run in 43:17

To convert miles into kilometers, divide by .6214

6.2 / .6214 = 9.97747 = 10K

43:17 - 6:59 min/miles

How now to convert to min/Km ??
19/05/2003 at 16:43
1 mile = 1.609 km
times by miles divided by 1.609 = times by km
19/05/2003 at 16:45

Thanks peeps.

19/05/2003 at 16:49
so you've got the miles > km sorted by x .6214 all you need to do is convert 43:17 into a decimal which is 43.283333

so if you're rounding up to 10k then your time per km is 4.3283 min which is approx 4:20 (4:19:something) which is what you got on message 1, give or take fractions of a second.

20/05/2003 at 08:51
Hi All

Thanks Gavo.

Here is something I found while surfing for information on conversion algorithms. Some of you guys might find it useful.

Rule of thumb: 1Km = 0.62miles. 1mile = 1.61Km.

To convert kilometers into miles, multiply by .6214.
To convert miles into kilometers, divide by .6214.

In detail:
1Km = 0.62miles
2Km = 1.24miles
3Km = 1.86miles
4Km = 2.49miles
5Km = 3.11miles
6Km = 3.73miles
7Km = 4.35miles
8Km = 4.97miles
9Km = 5.59miles
10Km= 6.21miles

1miles = 1.61Km
2miles = 3.22Km
3miles = 4.83Km
4miles = 6.44Km
5miles = 8.05Km
6miles = 9.66Km
7miles = 11.27Km
8miles = 12.87Km
9miles = 14.48Km
10miles = 16.09Km

5:00min/mile = 3:06min/Km
5:30min/mile = 3:25min/Km
6:00min/mile = 3:44min/Km
6:30min/mile = 4:02min/Km
7:00min/mile = 4:21min/Km
7:30min/mile = 4:40min/Km
8:00min/mile = 4:58min/Km
8:30min/mile = 5:17min/Km
9:00min/mile = 5:36min/Km
9:30min/mile = 5:54min/Km
10:00min/mile = 6:13min/Km
10:30min/mile = 6:31min/Km
11:00min/mile = 6:50min/Km
12:00min/mile = 7:27min/Km

3:00min/Km = 4:50min/mile
4:00min/Km = 6:26min/mile
4.30min/Km = 7:15min/mile
5:00min/Km = 8:03min/mile
5.30min/Km = 8:51min/mile
6:00min/Km = 9:39min/mile
6.30min/Km = 10:28min/mile
7:00min/Km = 11:16min/mile
7.30min/Km = 12:04min/mile
8:00min/Km = 12:52min/mile

20/05/2003 at 09:12
OK, now this one is what I do for a living!

The postings above provide a full answer I think, but if you want to get seriously anorakky then download the little program from the website below:

It is a seriously brilliant and simple piece of software (and its free!)

It will convert just about any imperial unit to a metric unit, or the other way round.
20/05/2003 at 09:19
wot about pacing (ie min/mile to min/km)?
20/05/2003 at 09:26
does that too!
20/05/2003 at 09:28
ooops! no it doesn't, apologies!

Although you could set it up as a custom unit, or alternatively e-mail the author and he may incorporate it into the next release (which tends to be quite frequent)
20/05/2003 at 09:52
good lord, the standard of mathematics teaching in this country is shocking!
20/05/2003 at 10:06
MK - that conversion chart above is great. As a South African living here for 2 years now I'm still battling to think/run/drive etc in miles. That's a big help - I just need to memorise the whole thing :-)
20/05/2003 at 10:54
Capricorn: Just visit Ireland. Distances between towns km. Speed limits in MPH.

Easy rule of thumb
miles *8 / 5 = km
km * 5 /8 = miles

The approximation is 0.625, but the actual is 0.623 so its only 0.3% out.

If you want to take your mind off things when you are out running try to do it in your head!
20/05/2003 at 11:47
And then go on a treadmill trying to work out what 8 minute miles is in mph or kph!!!

BTW 8min/mile = 7.5mph or 12.1kph
20/05/2003 at 11:56
I have never even considered 8 minute miles, let alone tried to convert it. To me, that is just pure fantasy!

10 minute miles is real easy to work out - 6mph!

There you go - one benefit of plodding is simpler maths.
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