Measured race
Race-based VDOT
Enter a race time
Use a measured race result or load a worked example.
Separate the models
The Daniels–Gilbert expression divides oxygen cost at race speed by a duration-dependent fraction. Speed is in meters per minute and duration is in minutes. No altitude, weather, course or running-economy adjustment is entered here.
V.O2’s explanation of VDOT distinguishes the race-derived score from measured VO₂max. The fraction term is part of this equation, not a measurement of your effort. An all-out, evenly paced race in comparable conditions is the intended input.
The reference classification cutoffs are retained general bands without a verified age-group calibration dataset here. They do not certify an athlete’s physiology. Riegel’s fixed 1.06 exponent is a separate endurance assumption; equivalents are scenarios, not guaranteed marks or personal training prescriptions.