Running Pace Calculator
Calculate running pace, finish time or distance from any two of the three, with 5K, 10K, half and full marathon presets in km or miles.
Written by Rahman · Last reviewed
Quick answer
Pace, time and distance are linked by one relationship: time = pace × distance. Running 5 km at a 5:00-per-km pace takes exactly 25:00. Enter any two of the three (distance, time, pace) and this calculator solves for the missing one, in kilometres or miles, with 5K, 10K, half marathon and marathon distance presets built in.
Results are general screening estimates, not medical advice or a diagnosis. They can read inaccurately for athletes, older adults, children and during pregnancy. Speak to a doctor or registered dietitian before changing your diet, exercise or medication.
About the Running Pace Calculator
Runners typically know two of three things for a given run or race (how far, how long, or how fast) and want the third. This calculator solves for whichever one is missing from the other two, rather than requiring a specific pair.
Distances can be entered directly or picked from a 5K, 10K, half marathon or full marathon preset, and everything works in either kilometres or miles.
Frequently Asked Questions
How do I convert a mile pace to a kilometre pace?
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A mile is about 1.60934 km, so multiply a per-mile pace by 0.62137 to get the equivalent per-kilometre pace, or use the unit toggle on this calculator to switch directly.
What pace do I need for a sub-2-hour half marathon?
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Set "Solve for" to Pace, enter 21.0975 km (or use the half marathon preset) and a time of 2:00:00, and the result is the exact pace per km or per mile needed to hit that finish time evenly.
Does this account for elevation or terrain?
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No. It calculates pure arithmetic pace from distance and time. Hills, heat and terrain all affect real-world effort at a given pace, but not the maths linking distance, time and pace themselves.