How fast can you run a 10km? Use this quick reference guide to estimate how fast you’ll run a half marathon.
10km PB | Predicted 21km time |
Sub-40mins | Sub-90 mins |
40-45 mins | 90 mins-1:40 |
45-50 mins | 1:40-1:55 |
50-55 mins | 1:55-2:05 |
55-60 mins | 2:05-2:15 |
60-65 mins | 2:15-2:25 |
65-70 mins | 2:25-2:35 |
70-75 mins | 2:35-2:45 |
75-80 mins | 2:45-3:00 |






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