Sports hub

Running Calculators

Plan running pace, race predictions, splits, cadence, heart-rate zones, nutrition, and endurance performance targets.

Start here What pace should I run?

Runners, coaches, and endurance athletes planning training, races, pacing, and fueling.

Choose a calculator

1 Running Pace Calculator - Calculate Your Pace Per Mile or KilometerFree Running Pace Calculator - Calculate your running pace per mile or kilometer. Perfect for marathon training, 5K races, and improving your running… Sports 2 Running Pace Calculator - Calculate Pace, Split Times & Race PredictionsCalculate your running pace per mile or kilometer, get split times, finish time predictions for 5K, 10K, half marathon, and marathon distances. Includes… Health 3 Running Pace Zones Calculator - Training IntensityCalculate your running pace zones based on your race time or threshold pace. Get personalized training zones for easy runs, tempo, intervals, and more. Sports 4 Running Heart Rate Zone CalculatorCalculate your 5 heart rate training zones using the Karvonen formula. Includes zone definitions and the 80/20 training rule. Health 5 Race Time Predictor (Race Time) - Sports CalculatorPredict your race times accurately with our free Race Time Predictor. Calculate expected finish times for 5K, 10K, half marathon, and marathon distances… Sports 6 Race Equivalency Calculator - Predict Your Race TimesCalculate equivalent race performances across different distances. Use the Riegel formula to predict your 5K, 10K, half marathon, and marathon times based… Sports 7 Race Splits Calculator - Even & Negative SplitsCalculate race split times for even pacing, negative splits, or custom strategies. Free running and cycling splits calculator for marathons, 5Ks, and more. Sports 8 Race Pace Split TableTurn a target race time into mile and kilometer split targets. Sports 9 Marathon Time Predictor - Race Time CalculatorPredict your marathon finish time based on recent race results using the Riegel formula. Calculate predicted times for 5K, 10K, half marathon, and full… Sports 10 Running Cadence Calculator - Optimal Steps Per MinuteCalculate your optimal running cadence and stride length for better efficiency and injury prevention. Free running cadence calculator with personalized… Sports 11 Stride Length EstimatorEstimate stride length from known distance and step count for better walking and running conversions. Sports 12 Race Nutrition Calculator - Fueling Strategy for Endurance AthletesCalculate your personalized race nutrition needs including carbs, calories, hydration, and electrolytes. Plan your fueling strategy for marathons,… Sports 13 Heart Rate Zone Calculator - Calculate Your Training ZonesFree Heart Rate Zone Calculator using the Karvonen formula. Calculate your optimal training heart rate zones for fat burning, cardio fitness, and peak… Sports

How to use this hub

  1. Use pace calculators when you know distance and time.
  2. Use race prediction and split tools when preparing for a specific event.
  3. Use cadence, stride, heart-rate, and nutrition tools when tuning training execution.

Common use cases

  • Convert distance and time into pace per mile or kilometer.
  • Predict race times and build split plans.
  • Estimate training zones, cadence, stride, and race nutrition.

Questions this hub answers

Can a calculator predict my exact race time?
No. It estimates based on your inputs. Weather, terrain, training load, fueling, sleep, and pacing discipline can all change race-day performance.
Should I train by pace or heart rate?
Both can help. Pace is useful for performance targets, while heart rate can better reflect effort when heat, hills, fatigue, or terrain changes.

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