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I've tried various calculators (runpaces software, mcmillan, fetcheveryone) and got different answers.
I ran 5k in 19:14 this weekend, and have a fairly long-standing target of sub 40 min 10k. Started in back running in Jan with 46 mins, ran 42:25 at Easter. Training has probably been more typical of 10k than 5k.
There are 2 races on the horizon - one in a fortnight and one in November. Both involve a fair travel, so would really only like to do one.
Be interested to know how peoples' times from 5k and 10k compare - the calculators I have used vary from 39:59 (yay!) to 40:36 (boo!).