RunSolver
Run the Numbers
The runner's toolkit — built for calculating, not tracking. Pace, splits, predictions, and workouts all in sync.
Everything a Runner Needs
Pace Calculator
Pick a distance or enter your own, set a finish time, and instantly see your pace, speed, and converted units.
Split Generator
Generate per-km or per-mile splits with even, negative, or positive strategies. Share a race card with friends.
Race Predictor
Use the Riegel formula to predict finish times across distances — from 1 mile to 50K. Adjust for fitness and see your age grade.
Workout Builder
Choose from smart templates — intervals, tempo, long run, speed work — with paces derived from your target race time.
Running Tools
Pace conversion, training zones, treadmill speed calculator, Boston Qualifier checker, race comparison, and more.
PR Tracker
Log your personal records and tap any PR to instantly populate your pace, splits, and predictions.
See It in Action
100% Free. No Ads.
RunSolver is completely free with no ads, no accounts, and no tracking. All calculations happen instantly on your device.