Health Calculators

Calculate your Body Mass Index with metric & imperial support. Includes ideal weight range, BMR, and TDEE.

Calculate target weight or height for a goal BMI. Includes healthy weight range, category, and optional comparison to current values.

Estimate body fat with the AR 600-9 circumference method and see the maximum allowable for your age plus pass/fail status.

Calculate Fat-Free Mass Index and normalized FFMI from weight, height and body fat, with separate interpretation scales for men and women.

Get daily calorie and macro targets to lose fat while building muscle, using Mifflin-St Jeor BMR, TDEE and protein, fat and carb splits.

Work out your daily fat target in grams from calories and fat percentage, or from body weight, with AMDR comparison and saturated fat limits.

Subtract fibre and sugar alcohols from total carbohydrates, with per-compound subtraction rates and US or EU label handling.

Work out your eating and fasting windows for 16/8, 18/6, 20/4, OMAD or a custom protocol, in 12-hour or 24-hour time.

Build a Chipotle burrito, bowl, tacos or salad and see total calories, protein, carbs, fat and sodium with a full itemized breakdown.

Estimate daily calorie needs while breastfeeding using CDC and IOM lactation figures, with activity adjustment and hydration guidance.

Daily calorie and macronutrient targets by trimester, calculated from pre-pregnancy weight with official protein and carbohydrate RDAs.

Estimate calories burned while rucking using body weight, pack weight, distance, time, grade, and terrain.

Find your strength level from Beginner to Elite for squat, bench press, deadlift and overhead press, based on one-rep max and bodyweight.

Work out your average step length from distance and steps, from height, or from walking speed and cadence, with stride length and steps per mile.

Recommend optimal ski length from height, weight, skill level, ski type, and gender—with ideal length and cm range.

Calculate the serum anion gap with or without potassium, apply the albumin correction, and read the result against the matching reference range.

Adjust measured serum calcium for albumin in conventional or SI units, with reference range interpretation and step-by-step working.

Calculate cardiac output using heart rate and stroke volume with the direct method. Includes cardiac index, normal range comparison, and clinical interpretation.

Calculate your accumulated sleep deficit based on recommended sleep duration versus actual sleep, and get a recovery timeline.

Calculate the remaining caffeine levels in your body, percent eliminated, and estimate when it will clear for a better night of sleep.

Project future hair length and estimate time to a target using personalized growth factors, breakage, trims, and optional past growth calibration.