Online Medical Tools
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Body Metrics
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Popular Tools
BMI Calculator
Calculate your Body Mass Index (BMI) instantly using height and weight. Free, WHO-validated formula with personalized health category insights for adults.
Open toolTDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) instantly using the Mifflin-St Jeor equation. Free, evidence-based calorie calculator with BMR breakdown and activity adjustments.
Open toolIdeal Weight
Calculate your ideal body weight using multiple formulas (Devine, Robinson, Miller, Hamwi). Find a healthy weight range based on your height and sex.
Open toolBody Fat Calculator
Calculate your body fat percentage using the U.S. Navy method. Enter your measurements to estimate body fat and understand your fitness category.
Open toolAll Tools
152 free calculators and health tools
BMI Calculator
Calculate your Body Mass Index (BMI) instantly using height and weight. Free, WHO-validated formula with personalized health category insights for adults.
Ideal Weight
Calculate your ideal body weight using multiple formulas (Devine, Robinson, Miller, Hamwi). Find a healthy weight range based on your height and sex.
Body Fat Calculator
Calculate your body fat percentage using the U.S. Navy method. Enter your measurements to estimate body fat and understand your fitness category.
Waist-to-Hip Ratio
Calculate your waist-to-hip ratio (WHR) to assess cardiovascular disease risk. A simple measurement used by the WHO as a health indicator.
Waist-to-Height Ratio
Calculate your waist-to-height ratio (WHtR) to screen for cardiometabolic risk. A simple metric where keeping your waist under half your height is often recommended.
BSA Calculator
Calculate body surface area using Du Bois, Mosteller, and Haycock formulas. Free BSA calculator for chemotherapy dosing, cardiac index, and clinical calculations. BSA depends on weight — check [BMI Calculator](/tools/bmi-calculator).
BMR Calculator
Calculate your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation. Estimate how many calories your body burns at rest each day. Multiply by activity factor with [TDEE Calculator](/tools/tdee-calculator).
TDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) instantly using the Mifflin-St Jeor equation. Free, evidence-based calorie calculator with BMR breakdown and activity adjustments.
Macro Calculator
Calculate your daily macronutrient needs for protein, carbs, and fat. Free macro calculator with customizable splits for cutting, bulking, or maintenance goals.
Water Intake
Calculate your recommended daily water intake based on body weight and activity level. Stay properly hydrated with personalized recommendations.
Calorie Calculator
Calculate your daily calorie needs based on the Mifflin-St Jeor equation. Get personalized BMR, TDEE, and target calories for weight loss, maintenance, or gain.
Pregnancy Weight Gain
Track pregnancy weight gain against IOM guidelines. Calculates recommended total gain based on pre-pregnancy BMI and current gestational age.
Did You Know?
The kidneys filter about 180 liters of blood every day — that's enough to fill a bathtub twice over.
Try eGFR CalculatorYour resting heart rate is one of the simplest indicators of cardiovascular fitness. Elite athletes can have a resting HR below 40 bpm.
Try Heart Rate ZonesPulse oximeters can overestimate oxygen levels by up to 3% in patients with darker skin tones, a gap that can delay critical care.
Try SpO2 to PaO2 ConverterAn HbA1c of 6.5% corresponds to an average blood sugar of about 140 mg/dL. A 1% drop in HbA1c can reduce diabetes complications by up to 40%.
Try HbA1c ConverterFree Forever
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All calculations happen in your browser. We never store or transmit your health data.
Evidence-Based
Our formulas come from peer-reviewed medical literature with cited sources.