What is calculated
A race-performance index from distance, velocity, and elapsed time.
VDOT Calculator
Estimated VDOT performance index
Enter your values, then calculate to see a verified result.
Reference range
How this result is calculated
A clear calculation path based on your inputs.
Inputs usedReview the information used for this result.
Full calculation and sourcesOpen Full calculation and sources to review normalized inputs, the formula sequence, assumptions, and evidence boundaries.
Versioned calculationFormula v1.0.1
Method
Apply the published Daniels-Gilbert oxygen-cost and duration equations.
Important boundary
The value is not measured oxygen uptake and conditions can shift it.
Use a measured effortEnter one representative distance and time.
5 km in 25:00Normalize velocityConvert to meters per minute.
200 m/minRead an indexKeep race conditions and model limits attached.
Not laboratory VO2 maxInterpretation
is the modeled race-performance index.
Observed pace remains visible.
Do not treat the value as measured VO2 max.
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Method and test recordFormula v1.0.1
- Recorded scope
- health-activity-performance-completion
- Publisher
- CalculatorGeek
- Recorded review date
- 2026-10-05
- Next source review
- 2027-04-05
- Definition fixtures
- 2 configured scenarios
- Published examples
- 2 shown below
Recorded method
Recompute model terms independently and verify time parsing, distance units, and representative boundaries.
These records describe the published model and reference tests. A test-case count is not a certification of every possible input or an independent specialist review. Editorial policy
Known limitations
- VDOT is not a direct VO2 max measurement.
- The model assumes a representative race-level effort.
- Terrain, wind, heat, altitude, pacing, and measurement error affect the result.
- Training pace prescriptions require context beyond one index.
Method sources
Latest model update
2026-10-05 - Initial evidence-led shared-system implementation with fixtures, boundaries, original support content, and intentional cluster links.
Reference inputs and expected results
Up to 12 examples from the configured definition fixtures are shown. Expected values use the stated output units; invalid inputs are intended to be rejected.
| Case | Inputs | Expected result |
|---|---|---|
| five kilometer reference | Race distance: 5 km; Elapsed time: 25:00 | time_minutes: 25; Observed velocity: 200 m/min; oxygen_cost: 36.0116; Estimated VDOT performance index: 38.3093629 VDOT (allowed numeric tolerance: 0.001) |
| mile unit equivalence | Race distance: 3.10685596 mi; Elapsed time: 25:00 | Observed velocity: 200 m/min (allowed numeric tolerance: 0.001) |
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On this page
What the VDOT Calculator answers
Estimate the Daniels-Gilbert VDOT race-performance index from a measured distance and elapsed time.
The calculation displays velocity, modeled oxygen cost, and sustainable fraction rather than only a score.
How to use the VDOT Calculator
- Enter a measured race or time-trial distance.
- Enter the matching elapsed time.
- Review observed pace and modeled terms.
- Use comparable conditions when tracking change.
Continue with the VO2 Max Calculator. Use a separate field-test oxygen estimate.
Formula, variables and calculation order
VO2 cost = -4.60 + 0.182258v + 0.000104v^2; divide by 0.8 + 0.1894393e^(-0.012778t) + 0.2989558e^(-0.1932605t), where v is m/min and t is minutes.
Inputs are normalized to the displayed base units, the calculation keeps full precision, and rounding is applied only to visible outputs.
Cross-check the next part of the workflow with the Race Time Predictor. Project a target distance with the Riegel model.
Worked example and boundary check
Worked example
A 5 km result in 25:00 uses 200 m/min and produces a VDOT value near 38.3.
Boundary check
Very short, very long, nonmaximal, hilly, hot, or wind-affected efforts can be poor inputs for the model.
How to interpret the result
Use VDOT as a repeatable race-performance index. It does not replace laboratory testing or establish safe training intensity.
- VDOT is not a direct VO2 max measurement.
- The model assumes a representative race-level effort.
- Terrain, wind, heat, altitude, pacing, and measurement error affect the result.
- Training pace prescriptions require context beyond one index.
For a separate result with different assumptions, open the Pace Calculator. Inspect the direct distance-time ratio.
Frequently asked questions
Is VDOT the same as VO2 max?
No. It is a race-performance model that can resemble but does not measure laboratory VO2 max.
Which race should I use?
Use a recent representative, accurately measured effort.
Can I compare different distances?
Yes cautiously; model fit and distance specificity can affect comparisons.
Does a higher value guarantee a faster future race?
No. Training, course, health, weather, and execution still matter.
Primary sources and evidence limits
Sources were checked 2026-10-05. They establish the stated method or interpretation boundary; they do not make a field estimate equivalent to laboratory measurement, coaching, medical diagnosis, or an individualized safety decision.