Use this running pace calculator to work out how fast to run your next race, plus expert advice on how to set your target times for 5K, 10K, half marathon and marathon events.
I also agree that in theory one would know where her HM effort is compared to her 10k but the reality is that fitness changes. Sometimes for the better and sometimes for the worse. I would expect my runner’s watch to help me naildown those equivalent paces the same way my coach helps...
Your cheat sheet for converting min/mile to min/km – and what paces you need to run to hit your 5K, 10K, half marathon and marathon targets.