Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

VO2 Max Calculator

Estimate your VO2 max (maximum oxygen uptake) from a timed run by combining distance, time, and age into a Cooper-style empirical formula. Use it as a benchmark for cardiovascular fitness and to track aerobic improvement across a training cycle.

Distance (meters)

Time (minutes)

Age (years)

Fill in the required fields to see your result.

Running

Race Time Predictor

Predict your finish time at any race distance using a recent result from a different distance. Ideal for setting realistic goals when stepping up from a 5K to a half marathon or full marathon.

Known Race Distance

Known Time (Hours) (hr)

Known Time (Minutes) (min)

Target Race Distance

Fill in the required fields to see your result.

Key differences

	VO2 Max Calculator	Race Time Predictor
Category	Running	Running
Inputs required	3	4
Result	Estimated VO2 Max (ml/kg/min)	Predicted Time (minutes)
What it does	Estimate your VO2 max (maximum oxygen uptake) from a timed run by combining distance, time, and age into a Cooper-style empirical formula. Use it as a benchmark for cardiovascular fitness and to track aerobic improvement across a training cycle.	Predict your finish time at any race distance using a recent result from a different distance. Ideal for setting realistic goals when stepping up from a 5K to a half marathon or full marathon.