Calculate pace, speed, splits, and race predictions from distance and time.
This running pace calculator computes your pace (min/km and min/mi), speed (km/h), estimated calories burned, and km-by-km split times from your distance and finish time. It also predicts race times using the Riegel formula — enter your 5K time and see predicted 10K, half marathon, and marathon times. Perfect for runners training for races, tracking progress, and planning race-day pacing strategies. Ideal for beginners learning to pace themselves and experienced runners optimizing their training. All calculations are instant and private — no data leaves your browser. The Riegel formula for race predictions is widely used by running coaches and validated across distances from 5K to marathon. Split times help you plan even or negative splits for race day.