> Catalyst Healthspan Calculators
Eleven free, evidence based calculators for VO2 max, grip strength, fitness age and body composition.
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Eleven free calculators for the numbers that predict how well you age, not just what you weigh. Each one runs in your browser, needs no sign up, and cites the study or threshold behind it.
Cardiorespiratory
- VO2 max: your percentile for age and sex, or an estimate from resting heart rate
- Fitness age: the age at which your cardiorespiratory fitness would be average
- Heart rate zones: five training zones in bpm, with the Karvonen method if you add resting heart rate
- Running pace: predict 5K, 10K, half and full marathon times from one race
Strength and stability
- Grip strength, scored against the AWGS sarcopenia threshold
- Sitting rising test, a floor test out of 10 used in published mortality research
Body composition and nutrition
- Waist to height ratio, a better signal than BMI
- Body fat percentage, US Navy tape method
- Protein intake target
- Fat loss timeline
- GLP-1 muscle loss: how much of the weight lost on a GLP-1 is likely to be muscle
Every calculator is embeddable on your own site with one line of code.
Built and maintained by Catalyst Performance, a longevity focused training studio in Singapore.