if you're doing a 5K in 20-21 minutes, then you are doing a good 7 minute mile pace or a little better. If you aren't dead at the end of that, then you have a good rough estimate of your pace and can extrapolate a little about your rough distances without a GPS, for instance 35 minutes is five miles and so on. If you want to be ready for the 10K, run for an hour which should put you well over the 6.2 miles of a 10K at your pace. Also measuring by car is very accurate. I have measurements from my house of: one mile two miles, two and a half miles and so on so I know what my round trips will be.
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"Religion is the one area of our discourse in which it is considered noble to pretend to be certain about things no human being could possibly be certain about"
--Sam Harris
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