⚡ 13 Free Tools

Health Tools & Calculators

Free interactive tools to understand your body better. No sign-up required.

Research We Build On

All our calculators are based on peer-reviewed studies and validated clinical norms. Here are the key references behind our algorithms.

Cardiovascular

Zhang D et al. (2016). Resting heart rate and mortality. CMAJ, 188(3). PMC
Shaffer F, Ginsberg JP (2017). HRV metrics and norms. Front Public Health, 5:258. PMC
Spodick DH (1992). Normal sinus heart rate. Am Heart J, 124(5).
Koenig J, Thayer JF (2016). Sex differences in HRV. Neurosci Biobehav Rev, 69.
Aubert AE et al. (2003). HRV in athletes. Sports Med, 33(12).

Sleep & Recovery

Hirshkowitz M et al. (2015). NSF sleep duration recommendations. Sleep Health, 1(1).
Feinberg I, Floyd TC (1979). Sleep cycle trends. Psychophysiology, 16(3).
Mah CD et al. (2011). Sleep extension and athletic performance. Sleep, 34(7).
Halson SL (2014). Monitoring training load. Sports Med, 44(S2).
Saw AE et al. (2016). Self-report monitoring in athletes. Br J Sports Med, 50.

Body Composition

Deurenberg P et al. (1991). BMI and body fatness. Br J Nutr, 65. PubMed
Hodgdon JA, Beckett MB (1984). US Navy body fat formula. Naval Health Research Center.
Kouri EM et al. (1995). Fat-free mass index. Clin J Sport Med, 5(4).

Lifestyle & Training

Arem H et al. (2015). Physical activity and mortality. JAMA Intern Med, 175(6).
Ekelund U et al. (2019). Sedentary time and mortality. BMJ, 366.
Wang X et al. (2014). Fruit/vegetable consumption and mortality. BMJ, 349.
Wood AM et al. (2018). Alcohol risk thresholds. Lancet, 391.
Meeusen R et al. (2013). Overtraining syndrome consensus. Med Sci Sports Exerc, 45(1). PubMed
Kellmann M, Kallus KW (2001). RESTQ-Sport. Human Kinetics.

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