Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
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.
Fill in the required fields to see your result.
Running
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.
Fill in the required fields to see your result.
Key differences
| Race Time Predictor | VO2 Max Calculator | |
|---|---|---|
| Category | Running | Running |
| Inputs required | 4 | 3 |
| Result | Predicted Time (minutes) | Estimated VO2 Max (ml/kg/min) |
| What it does | 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. | 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. |