Set the reference
Use the measured race distance. Custom units are meters, kilometers or miles; one mile is approximated as 1609.34m.
Seconds, M:SS or H:MM:SS. Example: 20:00. Blank and malformed clocks clear the table.
Equivalent times
Illustrative example: 20:00 for 5K.
VDOT performance index: 49.8. These are modeled comparisons; preparation and race conditions affect actual performances.
| Distance | Model time |
|---|---|
| 800m | |
| 1500m | |
| 1600m | |
| Mile | |
| 3K | |
| 3200m | |
| 5KReference distance | |
| 10K | |
| Half Marathon | |
| Marathon |
Read the comparison
The existing Daniels–Gilbert equation turns the reference distance and duration into a VDOT performance index. Each row solves that same equation for its distance. The reference row shows the computed inverse, so it should recover the entered time before display rounding.
The ten output distances run from 800m through the marathon. Clocks round to whole seconds, carrying across minutes and hours; calculations retain more precision. This is the VDOT model, rather than the separate Riegel power-law calculator.
A mathematical comparison does not establish preparation for a different event. Sprint, very long duration and unusual-distance inputs can be numerically solvable while falling outside a useful endurance comparison. Weather, course and event-specific training are not adjusted here.
VDOT is a performance-based index, distinct from measured VO2max. V.O2’s explanation of equivalent performances discusses why race results can differ from a model comparison. The source explains interpretation; it does not certify this implementation.