Easy run pace by marathon time(Since a lot of people here aren't marathoners, I'll give 5k equivalence for marathons):
4:40 minute pace(2:02 marathon equal to a 12:44 5k) = 6:40 minute pace
4:50 minute pace(2:06 marathon equal to a 13:12 marathon)= 6:50 minute pace
5:00 minute pace(2:11 marathon equal to a 13:39 5k) = 7 minute pace
6:00 minute pace(2:37 marathon equal to a 16 minute 5k) = 8 minute pace
7:00 minute pace(3:03 marathon equal to a 19 minute 5k) = 9 minute pace
8:00 minute pace(3:29 marathon equal to a 22 minute 5k )= 10 minute pace
9:00 minute pace(3:55 marathon equal to a 24 minute 5k)= 11 minute pace
10:00 minute pace(4:22 marathon equal to a 28 minute 5k )= 12 minute pace
Any slower focus on walking
*give or take 30 seconds
This is how Kipchoge does it, but other distance runners run faster for their easy runs like for instance Farah. Different for different ppl. You have to figure out what works for you.