Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Fitness
Protein Intake Calculator
Estimate daily protein need (grams) from body weight, training intensity, and goal (maintain, build, or lose weight). Targets evidence-based ranges for active people: 1.2–2.2 g protein per kg body weight depending on activity and objective.
Fitness
VO2 Max Estimator
Estimate VO2 max (maximum oxygen uptake) in ml/kg/min from a recent running performance — distance, time, and body weight. A field-test approximation of one of the most important cardiorespiratory fitness markers.
Key differences
| Protein Intake Calculator | VO2 Max Estimator | |
|---|---|---|
| Category | Fitness | Fitness |
| Inputs required | 3 | 3 |
| Result | Daily Protein Needed (g) | Estimated VO2 Max (ml/kg/min) |
| What it does | Estimate daily protein need (grams) from body weight, training intensity, and goal (maintain, build, or lose weight). Targets evidence-based ranges for active people: 1.2–2.2 g protein per kg body weight depending on activity and objective. | Estimate VO2 max (maximum oxygen uptake) in ml/kg/min from a recent running performance — distance, time, and body weight. A field-test approximation of one of the most important cardiorespiratory fitness markers. |