Body measures worked from the standard formulas — height, weight, and the indices built on them.
Calculate Body Mass Index from height and weight in metric or imperial units, with the category shown.
Estimate how much water to drink per day from body weight and activity level.
Estimate your one-rep max from a weight and reps using the Epley and Brzycki formulas, with a percentage-of-1RM training table.
Work out how much bacteriostatic water to add and how many syringe units to draw for a target peptide dose.
Estimate your Total Daily Energy Expenditure — the calories you burn each day — from your BMR and activity level, with calorie targets for losing, maintaining, or gaining weight.
Find your Basal Metabolic Rate — the calories your body burns at complete rest — using the Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle equation.
Turn your daily calorie target into grams of carbs, protein, and fat for any diet split — balanced, low-carb, high-protein, or keto.
Find how many grams of protein to eat per day from your body weight and goal — general fitness, building muscle, or losing fat while keeping muscle.
Estimate your body fat percentage from tape measurements using the U.S. Navy method, with your body-fat category, lean mass, and fat mass.
Calculate how many calories you burn during any activity from its MET value, your body weight, and the time spent — across 25+ exercises.
Estimate blood alcohol content with the Widmark formula from your drinks, body weight and time elapsed.
Convert underbust and bust measurements into a US bra size, then read the sister sizes and the UK, EU, AU and Japan equivalents.
Estimate ideal body weight from height and sex with the Devine, Robinson, Miller and Hamwi formulas, plus a healthy BMI weight range.