Health & Fitness Calculators
BMI, TDEE, body fat, pregnancy, heart rate zones, blood pressure metrics, kidney function, and 60+ more health tools using evidence-based formulas.
Every health calculator on this page uses a peer-reviewed formula or clinically accepted standard — Mifflin-St Jeor for BMR, Harris-Benedict for TDEE, US Navy circumference method for body fat, Friedewald equation for LDL cholesterol, CKD-EPI 2021 for eGFR, Karvonen for heart rate zones, Naegele's rule for pregnancy due dates. The math is shown alongside the result so you can verify and learn, not just trust the number. These tools are for educational use — talk to a licensed healthcare provider before making medical decisions.
Most Popular
Online BMI Calculator (Adults)
Calculate your Body Mass Index (BMI) for adults. Get your BMI category, health risk level, and personalized recommendations. Free, instant, no signup.
Open Calculator →Calorie, BMR & TDEE Calculator
Calculate daily calorie needs, Basal Metabolic Rate (BMR), and Total Daily Energy Expenditure (TDEE) from your body data and activity level. Includes macros.
Open Calculator →Calorie Deficit Calculator (Diet)
Calculate your daily calorie target for weight loss. Includes weekly weight loss projections.
Open Calculator →Pregnancy Due Date Calculator
Calculate gestational age, estimated due date (EDD), and fetal development milestones based on your last menstrual period (LMP).
Open Calculator →Macro Calculator (Carbs, Protein, Fat)
Daily carbs, protein, and fat targets for any goal (cut, maintain, bulk, keto, high-protein, endurance). Uses Mifflin-St Jeor BMR + activity multiplier.
Open Calculator →Caffeine Calculator (Intake + Half-Life)
Audit daily caffeine vs the 400 mg safe limit and model how much is still in your system after N hours using the 5-hour half-life.
Open Calculator →GLP-1 Out-of-Pocket Cost Calculator (Wegovy / Ozempic / Zepbound)
Monthly out-of-pocket for Wegovy, Ozempic, Mounjaro, Zepbound, or compounded semaglutide. Factors insurance tier (covered/not covered), deductible status, manufacturer savings card eligibility, July 2026 Medicare bridge.
Open Calculator →Body Recomposition Calculator
Plan simultaneous fat loss + muscle gain (recomp): macro plan, realistic expectations, timeline, and progress tracker.
Open Calculator →Sleep Coach Calculator (REM Stages)
Analyze sleep stage distribution (REM/Deep/Light), sleep quality score, chronotype quiz, and caffeine cutoff time.
Open Calculator →All Health & Fitness Calculators
- AQI🌫️
- IF⏰
- Metabolic🩺
- Biological Age⏳
- HRV💓
- Child Nutrition🧒
- Walking🚶
- Sleep😴
- Dosage💊
- Blood Sugar🩸
- Blood Pressure🩺
- Ovulation🥚
- Pregnancy USG🩺
- Ideal Weight⚖️
- Pregnancy BMI🤰
- eGFR🫘
- Baby Weight👶
- Protein🥩
- Body Fat🏋️
- Menstrual Cycle🩸
- Stunting👶
- Genetic Height📏
- Mental Health🧠
- BMI Children👶
- Fertility Window🤰
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