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🏃 Cardio & Running
Pace, race predictions, heart rate zones, VO2 max and calorie burn.
Running Pace Calculator
Enter two of pace, time and distance and get the third instantly — with splits for 5K, 10K, half and full mara…
Race Time Predictor
Run a 5K PB last weekend? Enter any recent race result and see predicted equivalents from 1500 m to the full m…
Heart Rate Zone Calculator
Find your five heart rate training zones — from easy Zone 2 base miles to maximum Zone 5 efforts — from your a…
VO2 Max Calculator
VO2 max is your aerobic engine size. Estimate yours from a recent race or time-trial distance and time.…
Calorie Burn Calculator (MET)
Pick an activity, enter your weight and duration to estimate calories burned using the Compendium of Physical …
Pace to Speed Calculator
Treadmill says 12 km/h — what pace is that? Enter a pace or a speed and get all four units instantly.…
Cycling Speed & Time Calculator
Plan a ride: enter distance and your expected speed to get ride time, or enter a recent ride to compute averag…
Steps to Calories Calculator
Turn 10,000 steps into real numbers. Enter steps, weight and pace to estimate calories burned walking.…