Human Calculator

The Human Body Calculator assists users in computing personal health metrics such as BMI, BMR, TDEE, ideal weight, body fat percentage, and lean body mass based on their age, gender, height, weight, and activity level.

Use Our Human Calculator

Guide to Using the Human Body Calculator

Step 1: Input Your Personal Information

Begin by entering your personal information into the appropriate input fields. Each field has specific requirements and validation rules that you need to follow.

  • Age: Enter your age using numbers. The acceptable range is from 1 to 120.
  • Gender: Choose your gender from the dropdown options: Male or Female.
  • Height: Enter your height in centimeters. Valid entries range from 30 to 300 cm.
  • Weight: Enter your weight in kilograms. The range for this field is from 1 to 500 kg.
  • Activity Level: Select your activity level from the dropdown list. Options include:
    • Sedentary (little or no exercise), value: 1.2
    • Lightly active (light exercise 1-3 days/week), value: 1.375
    • Moderately active (moderate exercise 3-5 days/week), value: 1.55
    • Very active (hard exercise 6-7 days/week), value: 1.725
    • Extra active (very hard exercise & physical job), value: 1.9

Step 2: Understanding the Calculations

The calculator will compute several results based on the information you provided. Below is a brief explanation of each calculated field.

  • BMI (Body Mass Index): This is calculated using the formula: weight / pow(height/100, 2). It is expressed in kg/m2.
  • BMR (Basal Metabolic Rate): Calculated separately for males and females using:
    • Male: (10 * weight + 6.25 * height - 5 * age + 5)
    • Female: (10 * weight + 6.25 * height - 5 * age - 161)

    The result is presented in calories/day.

  • TDEE (Total Daily Energy Expenditure): This formula is: bmr * activityLevel. It estimates your daily caloric needs and is expressed in calories/day.
  • Ideal Weight (Hamwi Formula): Calculated using:
    • Male: (48 + 2.7 * ((height/2.54) - 60))
    • Female: (45.5 + 2.2 * ((height/2.54) - 60))

    The ideal weight is provided in kilograms (kg).

  • Body Fat % (BMI Method): This is calculated using: (1.2 * bmi) + (0.23 * age) - (gender == 'male' ? 16.2 : 5.4). The result is presented as a percentage.
  • Lean Body Mass: This is computed as: weight * (1 - (bodyFat/100)). It shows the lean mass in kilograms (kg).

Step 3: Interpreting the Results

Once you input all the required information, the calculator will automatically provide the results, formatted accordingly. Pay close attention to the units and format of each result for accurate interpretation.

The calculated values of BMI, BMR, TDEE, Ideal Weight, Body Fat, and Lean Body Mass can provide valuable insights into your health status, and help guide fitness or dietary plans to meet your specific needs.