Health calculators

Track your health metrics with our evidence-based collection of health and fitness calculators. From BMI and body fat to calorie needs and pregnancy timelines, every tool uses clinically validated formulas and works instantly in your browser.

Popular Health Calculators

• BMI Calculator — Calculate your Body Mass Index (BMI) instantly. BMI calculator for men and women with metric & imperial units. Understand your weight category and health risks.
• Calorie Calculator — Calculate your daily calorie needs based on your age, weight, height, and activity level.
• Body Fat Percentage Calculator — Estimate your body fat percentage using various measurement methods.
• Protein Calculator — Calculate your daily protein requirements based on your goals and activity level.
• Water Intake Calculator — Calculate how much water you should drink daily based on your weight and activity.
• Heart Rate Zones Calculator — Calculate your heart rate training zones for optimal exercise intensity.
• Macronutrients Calculator — Calculate your optimal daily macronutrient targets for protein, carbohydrates, and fat based on your calorie intake and diet approach.
• TDEE Calculator — Calculate your TDEE (Total Daily Energy Expenditure) for weight loss or muscle gain. TDEE calculator with activity levels and BMR.
• Ideal Weight Calculator — Calculate your ideal body weight using Devine, Miller, Robinson, and Hamwi formulas. IBW calculator with frame size adjustment.
• Pregnancy Calculator — Calculate your due date, pregnancy week, and trimester using Naegele's Rule. pregnancy calculator based on last menstrual period (LMP).

All calculators are accurate, require no signup, and run entirely in your browser. Browse all calculators →