Sports & Running Calculators

Training math for runners, riders and gym-goers: work out your pace and predict race times, find your heart-rate zones, convert treadmill speeds, turn steps into distance and estimate calories burned. Every result shows the formula behind it, so you can see exactly how your numbers are made.

• Running Pace CalculatorYour pace per km and per mile from any distance and finish time — plus your speed in km/h.
• Race Time PredictorPredict your 10K, half or marathon time from a recent race, using Riegel's endurance formula.
• Heart Rate Zones CalculatorYour five training zones from age and resting heart rate, using the Karvonen (heart rate reserve) method.
• Calories Burned CalculatorCalories burned by activity, weight and time, using standard MET values for common exercises.
• Treadmill Pace ConverterConvert treadmill speed in km/h to pace per kilometre and per mile — and to mph.
• Steps to Km & Miles CalculatorHow far your steps take you — convert a step count into kilometres and miles from your stride length.
• VO₂ Max Calculator (Cooper Test)Estimate your VO₂ max from how far you can run in 12 minutes — the classic Cooper field test.