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Pace & time
Pace chart
Pace ⇄ speed ⇄ finish time for 5K, 10K, half and marathon.
Pace ⇄ speed converter
Switch between pace (min/mi or min/km) and speed (mph or km/h).
Pace calculator
Enter two of three values, we work out the third.
Race time predictor
From a recent race, estimate your times over other distances.
Race splits
Your mile-by-mile splits, ready to print for race day.
Physiology & zones
MAS calculator
Your maximal aerobic speed and training paces, Jack Daniels method.
VO₂max calculator
Estimate your VO₂max from a race time (VDOT) or your MAS.
Training zones
Your 7 pace zones and their heart-rate equivalents.
Max HR & heart-rate zones
Estimated max heart rate and your 5 heart-rate zones (Karvonen included).
Trail & elevation
Effort-km & elevation
Distance + elevation gain → the equivalent effort on flat ground.
Handy calculators
Running calories
Calories burned by distance, body weight and pace.
Treadmill equivalence
The incline and pace that match running outdoors.
BMI for runners
Your body mass index, read for running.
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Pace chart
Pace ⇄ speed converter
Pace calculator
Race time predictor
Race splits
MAS calculator
VO₂max calculator
Training zones
Max HR & heart-rate zones
Effort-km & elevation
Running calories
Treadmill equivalence
BMI for runners
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