Running tools
Free calculators to plan your training and races — built with running in Bangkok's heat in mind.
VO2max calculator
Estimate VO2max from a race, the Cooper test or heart rate, plus training paces.
Running pace calculator
Pace per km from a finish time — or finish time from a pace — with splits.
Race time predictor
Predict 5K to marathon times from one recent race result.
Heart rate zone calculator
Your 5 training zones and Zone 2 heart rate, from age and resting HR.
Heat and humidity pace calculator
How much to slow down for Bangkok's temperature and humidity.
Sweat rate calculator
Litres of sweat per hour, and how much to drink on long runs.
Treadmill pace converter
Convert km/h and mph to pace per km and per mile.
Race pace band and split planner
Per-km split times for your goal, with even or negative splits.
Running calories calculator
Calories burned per run, per km and per hour.