❤️ Health & Fitness

Health & Fitness Calculators

Evidence-based tools for body weight, nutrition, metabolism, fitness and lifestyle. Formulas sourced from WHO, CDC and NIH. All calculations run in your browser nothing is stored or shared.

⚖️ Body Weight & Composition

⚖️ Body
BMI Calculator
Body Mass Index with a visual WHO category gauge, healthy weight range, chart and PDF. Metric and imperial.
Metric & Imperial • Chart • PDF
 👗 Sizing
Bra Size Calculator
Find your correct bra size from underbust and overbust measurements. UK, US, EU, FR and AU sizing with conversion chart.
UK, US, EU, AU • Size chart

🍎 Nutrition & Metabolism

🍎 Nutrition
Calorie Calculator
Daily calorie target, TDEE, BMR and full macro split (protein/carbs/fat). Mifflin-St Jeor formula, 5 activity levels.
TDEE, BMR, macros • 5 activity levels
 🔥 Metabolism
BMR Calculator
Basal Metabolic Rate using both Mifflin-St Jeor and Harris-Benedict formulas. Full TDEE table at 5 activity levels.
Two formulas • TDEE table • PDF

💪 Fitness & Performance

❤️ Fitness
Heart Rate Calculator
Maximum heart rate and 5 training zones by age and resting HR. Uses Fox, Tanaka and Gulati formulas.
3 formulas • 5 training zones • BPM ranges
 💪 Strength
One Rep Max Calculator
Estimate your 1RM from any weight and reps using 5 published formulas. Full training percentage table included.
5 formulas • Training weight table
 💪 Body
Body Fat Calculator
Estimate body fat % using the US Navy circumference method and BMI method. ACE fitness category, ideal range, and fat-to-lose estimate.
US Navy formula • BMI method • ACE categories
 🌸 Fertility
Ovulation Calculator
Find your fertile window and estimated ovulation date. 3-cycle fertility calendar with period, fertile and ovulation day markers.
Fertile window • 3-cycle calendar

🌍 Health & Environment

🍷 Safety
Blood Alcohol Calculator
Estimate BAC using the Widmark formula. Time to sober up, legal driving limits for 40+ countries.
Widmark formula • Legal limits • Sober time
 🌱 Eco
Carbon Footprint Calculator
Annual CO₂ from car travel, flights, home energy and diet. Compare to US and global averages. Practical tips included.
Travel, home, diet • Country comparison

About Our Health Calculators

Every health calculator uses formulas from authoritative sources: WHO, CDC, NIH, and peer-reviewed medical journals. Sources are cited on each individual page. All calculations run in your browser no personal data is transmitted or stored.

🏛️ WHO Guidelines 🏥 CDC Standards 🔬 NIH References 🔒 No data stored
Medical disclaimer: These tools provide general health information for educational purposes only. They do not constitute medical advice. Consult a qualified healthcare professional before making health decisions.