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Accurately calculate your average running pace and split times based on your distance and time.
Hour
Minute
Second
Your Pace
km Pace
05:00
mile Pace
08:03
Speed (km/h)
12.00 km/h
Speed (mph)
7.46 mph
Race Time Predictions
Splits
How to Use
Switch between tabs above to calculate pace, time, or distance. At least two values are required.
Select 'Half Marathon' or 'Full Marathon' to auto-fill official distances.
All calculations are performed locally in your browser; no data is uploaded.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
Running pace is elapsed time divided by distance, commonly shown as minutes per mile in the United States or minutes per kilometer. This calculator has three solve modes: enter distance and elapsed time to find pace; distance and pace to find time; or time and pace to find distance. It also reports the corresponding mile and kilometer pace, speed, cumulative kilometer splits, and even-pace estimates for standard race distances.
The conversion uses the international mile: 1 mile = 1.609344 kilometers. That exact relationship is listed by the US National Institute of Standards and Technology. Source: NIST, “Guide to the SI, Appendix B.8: Conversion Factors” — supports the mile-to-kilometer conversion; checked September 28, 2026.
Pace = elapsed time ÷ distance
Elapsed time = pace × distance
Distance = elapsed time ÷ pace
Speed in mph = 3600 ÷ pace in seconds per mile
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Select whether you know pace, finish time, or distance. The selected mode determines which value the calculator solves for.
Choose miles or kilometers, then pick a common distance or type a custom distance. Presets include 3K, 5K, 10K, half marathon, and marathon; the selected unit changes how the distance and pace fields are read.
Enter the remaining known values. Time uses hours, minutes, and seconds; pace uses minutes and seconds per mile or kilometer. For example, a 5K in 25:00 gives 5:00 per kilometer, which is about 8:03 per mile.
Review the solved value, both pace units, speed in mph and km/h, kilometer split table, and standard-distance estimates. Split rows are cumulative elapsed times at each kilometer, plus a final partial distance when applicable.
Use cases
See how the tool fits into real work and everyday tasks.
A runner with a goal finish time can select the race distance and solve for pace. The displayed even splits offer simple checkpoints to compare with a watch or course markers.
After a run, enter distance and elapsed time to calculate average pace and speed. Use the mile or kilometer view that matches the device or event results you are comparing.
A coach or running group can convert a known pace between miles and kilometers before sharing a workout note, reducing mental arithmetic when members use different units.
Q&A
Find concise answers to common questions and confusing cases.
Multiply seconds per kilometer by 1.609344 to get seconds per mile. For instance, 5:00 per kilometer is 300 seconds × 1.609344 = about 483 seconds, or 8:03 per mile. The screen rounds displayed times to whole seconds.
It multiplies your calculated average pace by each listed race distance. It is a constant-pace arithmetic estimate, not a performance prediction or training recommendation.
The split table is built at kilometer intervals, regardless of the selected input unit. Use the separate per-mile pace result for a mile-based target; kilometer split rows are not mile splits.
For a distance that is not a whole number of kilometers, the final row represents the remaining fraction and its cumulative time at the same average pace.
Notes
Review scope, result limitations, and important precautions before use.
The calculations assume one average pace across the whole distance. They do not account for hills, turns, weather, terrain, stops, fatigue, or a changing race strategy. The standard estimates and split table are arithmetic guides only. For races, training decisions, or official results, use course and event information relevant to your situation.
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