Pace Calculator

How it works

Pace = time / distance. Time = pace × distance. Distance = time / pace. Convert between min/mile and min/km by multiplying/dividing by 1.609. For race planning: 5K (3.1 mi), 10K (6.2 mi), half marathon (13.1 mi), marathon (26.2 mi). Negative splits (faster second half) are the optimal marathon strategy. Easy runs should feel conversational—roughly 60–75% of max heart rate.