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Browse practical calculators and converters with clear inputs, transparent formulas, and useful explanations.

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Calculate the original age-and-weight OSTA osteoporosis screening index with exact source bands and population limitations.

Calculate child or teen BMI-for-age percentile from exact CDC LMS data for completed months 24-239 with visible z-score and limits.

Add best left and right grip trials and compare with CDC NHANES age- and sex-specific reference bands for ages 15-69.

Calculate the official 11-item MRS total and somatic, psychological and urogenital domain scores with clear limits.

Calculate the public PHQ-9 total, see standard score bands and keep the self-harm item visibly separate with urgent-safety guidance.

Check the five NHLBI metabolic-syndrome criteria with transparent thresholds, treatment flags and clear diagnostic limits.

Calculate the official CDC Prediabetes Risk Test score and see why only a blood test can diagnose prediabetes.

Calculate the published Levine PhenoAge model from age and nine laboratory biomarkers with exact units and visible limits.

Compare current lean mass with a user-selected FFMI scenario without pretending to predict a genetic muscle-gain ceiling.

Compare bust or chest, waist and hips with a transparent apparel-proportion method that does not claim a medical body type.