Sports
Pace, VO₂ max, power, heart rate, racing
VO₂ Max Calculator (Cooper Test)
Estimate VO₂ max from the distance run in a 12-minute Cooper test.
Race Time Predictor
Predict a race time at a new distance from a known result (Riegel formula).
Running Speed & Pace Calculator
Your speed (km/h) and pace (min/km) from a distance and a time.
Swimming Pace Calculator
Your pace per 100 m and speed from a swim distance and time.
Power-to-Weight Ratio Calculator
Your cycling power-to-weight ratio in watts per kilogram.
FTP Calculator
Functional threshold power from a 20-minute test (95%), plus W/kg.
Target Heart Rate Calculator (Karvonen)
Your training heart rate using the Karvonen heart-rate-reserve method.
Pace Converter (min/km ⇄ min/mile)
Convert running pace between minutes per kilometre and per mile.
Strength-to-Weight Ratio Calculator
How much you lift relative to your body weight.
Sweat Rate Calculator
Your fluid loss per hour from weight change and fluid drunk during exercise.