Pace Calculator

How Pace Is Calculated

Pace is simply your total time divided by total distance, expressed as minutes and seconds per mile or per kilometer. This calculator converts your entered distance and finish time into a per-mile and per-kilometer pace, then derives your average speed (distance divided by time, converted to miles per hour and kilometers per hour). The race-time projections in the table assume you hold that exact pace across each standard distance (5K = 3.10686 miles, 10K = 6.21371 miles, half marathon = 13.10938 miles, marathon = 26.21875 miles) — in practice, most runners slow slightly over longer distances, so treat these as a starting estimate rather than a guarantee.

Using Pace to Plan Training and Races

Runners typically use pace rather than speed because it maps directly onto how race splits are reported (e.g., "7:30 per mile") and makes it easy to judge whether you're on track during a run. If you're building a broader training plan, pairing your pace data with a target heart rate range helps you gauge effort level as well as speed, since pace alone doesn't account for terrain, heat, or fatigue. If your goal is weight management alongside your running, the calories burned calculator can estimate energy expenditure for a given pace and duration.

A Note on Accuracy

This tool provides a mathematical estimate based on constant pace, not a physiological prediction — actual race performance depends on training level, conditions, and pacing strategy. It is intended for general planning purposes and is not a substitute for guidance from a coach or medical professional, particularly if you're returning from injury or starting a new training program.