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Optimize Your Run: Essential Calculators
Unlock your running potential with our suite of free, easy-to-use calculators. Plan your pace, predict race times, understand your heart rate zones, and strategize your splits for your 5k, 10k, or marathon.
Pace Calculator
Instantly calculate your running pace, finish time, or distance. Perfect for planning workouts and race strategy. Know your numbers, crush your goals.
Use Pace Calculator Race Time Predictor
Estimate your finish times for popular race distances (5K, 10K, Half, Marathon) based on a recent performance. Set realistic goals and track your improvement.
Predict My Race Time Heart Rate Zone Calculator
Discover your optimal training heart rate zones using the Karvonen method. Train smarter, recover better, and maximize your aerobic and anaerobic development.
Find My HR Zones Split Time Calculator
Plan your race with precision. Calculate even splits or upload a GPX file for AI-powered, elevation-adjusted split recommendations.
Plan My Splits