Running
Pace and speed
Finish time calculator
km
Finish time calculator
Race time predictor
Based on the Riegel formula (T₂ = T₁ × (D₂/D₁)^1.06).
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Predicted time
Pace
Convert your running pace, calculate your expected finish time and predict your race time over a new distance. Indispensable for training planning and race preparation.
Frequently asked questions
A comfortable starting pace for beginners is typically between 11:15 and 13:45 min/mile (7:00–8:30 min/km). A useful guide: you should be able to hold a conversation while running (the "talk test"). This indicates you are training within your aerobic zone.
Multiply your pace (min/mile) by 13.1 miles. At a pace of 10:00 min/mile, the expected finish time is 10 × 13.1 = 131 minutes (2:11:00). Allow for a slight slowdown in the second half if you have not fully tested that pace.
The Riegel formula is: T₂ = T₁ × (D₂/D₁)^1.06. With a 10K time of 50 minutes, your estimated marathon time is 50 × (26.2/6.2)^1.06 ≈ 247 minutes (4:07). The formula assumes you run both distances at optimal effort.
A pace of 10:00 min/mile equals 6 mph. The formula is: mph = 60 ÷ pace (in min/mile). At 8:00 min/mile that is 7.5 mph; at 12:00 min/mile that is 5 mph.