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Biking versus running miles.

I've mentioned before that I'm registered for my first Duathlon next month. I'm doing the Sprint distance, which is a run, bike, run at about 3, 12, and 3 miles for this race.

Since I'm not really working today, I decided to find out how many equivalent running miles it would be if the bike portion was a run as well. I've run in many races up to a half marathon.

So I was curious, am I doing the equivalent of a half marathon in this duathlon?

As with most things, it turns out, the answer somewhat varies. The common answer is apparently that 1 running mile is about 2 to 3 biking miles depending on calories burned and some other factors.

So my 3, 12, 3 race is between 10 and 12 running miles. Not quite a half marathon.