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It's not very sophisticated, generally go on how it feels (legs/heart/breathing) as I don't have a posh running watch or anything like that to tell me how fast I'm going (and phone app is a bit rubbish/erratic for current pace) and aim for a faster-than-cruising pace that I feel I can maintain. They normally end up being somewhere around 4:15-4:30 per km.
@Arducius
What kind of pace do you aim for on your 1km intervals?