19 calculators
Health and fitness calculators
Health calculators turn measurements into ranges you can act on: body mass index, calorie needs, heart-rate zones, and pregnancy dates. They are estimates, not medical advice, but they give a clear starting point before you talk to a clinician.
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BMI Calculator
Calculate your Body Mass Index (BMI) to determine if you're at a healthy weight. Includes BMI Prime, Ponderal Index, and healthy weight range.
BMR Calculator
Calculate your Basal Metabolic Rate (BMR) to determine how many calories your body burns at rest
Calorie Calculator
Calculate your daily calorie needs based on your BMR and activity level
Body Fat Calculator
Estimate your body fat percentage using various methods
Ideal Weight Calculator
Calculate your ideal body weight based on height and gender
Body Surface Area Calculator
Calculate body surface area (BSA) using Du Bois formula
Waist-to-Hip Ratio Calculator
Calculate waist-to-hip ratio to assess health risks
TDEE Calculator
Calculate Total Daily Energy Expenditure (TDEE) based on BMR and activity level
Body Water Calculator
Calculate total body water using Watson formula
Calorie Deficit Calculator
Calculate daily calorie deficit needed to reach your target weight
Macronutrient Calculator
Calculate protein, carbs, and fat grams based on daily calories and percentages
Heart Rate Zones Calculator
Calculate your target heart rate zones for different training intensities
Protein Needs Calculator
Calculate daily protein requirements based on weight, activity level, and goals
Water Intake Calculator
Calculate daily water intake requirements based on weight and activity level
Lean Body Mass Calculator
Calculate lean body mass and fat mass from total weight and body fat percentage
Ovulation Calculator
Estimate your ovulation date and fertile window based on your menstrual cycle
Due Date Calculator
Calculate your estimated pregnancy due date based on your last menstrual period
Blood Alcohol Content (BAC) Calculator
Estimate your blood alcohol content based on drinks consumed, time elapsed, and body weight
Caffeine Safety Calculator
Estimate your safe daily limit of caffeine based on body weight.
Related guides
BMR, TDEE, and a calorie deficit you can actually follow
Weight change is mostly energy in versus energy out. BMR and TDEE turn that idea into a daily calorie range without treating the result as a medical diagnosis.
Understanding BMI: Is It Really the Best Measure of Your Health?
Explore the science behind Body Mass Index (BMI), its limitations, and what other health indicators you should consider for a complete wellness profile.
Sleep Cycles & Productivity: Why 8 Hours Isn't Always Enough
It's about *when* you wake up. Understanding non-REM and REM cycles to calculate the perfect alarm time.
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