Pace Calculator

Our Pace Calculator solves for any unknown in the runner's fundamental equation: Distance = Pace × Time. Whether you know your time and want your pace, know your pace and want a finish time, or want to find how far you can run in a set time — this tool handles all three modes. Select your calculation mode at the top: Calculate Pace (time ÷ distance), Calculate Finish Time (pace × distance), or Calculate Distance (time ÷ pace). For distance, use the race preset buttons — 1K, 5K, 10K, Half Marathon (21.097 km), or Full Marathon (42.195 km) — or enter any custom distance in kilometers or miles. The unit toggle lets you work in either system. Enter time in hours, minutes, and seconds. For pace, enter minutes and seconds per kilometer or per mile. Results show your calculated value plus a complete per-kilometer and per-mile splits table for the full distance. This splits table is especially useful for race day planning — print it or screenshot it to keep your target splits visible during the race. The optional calorie estimate uses your body weight and the distance to estimate total energy expenditure. Running burns approximately 1 kcal per kilogram per kilometer, making this a quick way to estimate fuel needs for long runs. Speed appears in both km/h and mph regardless of your selected unit system, so you can compare with treadmill speed settings which are typically displayed in mph. Pro tips for race planning: start 10-15 seconds per km slower than your target pace for the first 5km, especially in marathon racing. Positive splits (going out too fast) are one of the most common causes of hitting the wall. Use this calculator to plan realistic negative splits — running the second half slightly faster than the first.