Accurately calculate your body fat percentage with the Body Fat Calculator. Input your measurements for precise results.


Formula: Body Fat Percentage =

495 / (1.0324 - 0.19077 x log10(waist - neck) + 0.15456 x log10(height)) - 450

Body Fat Percentage N/A

A body fat calculator is an invaluable tool for those looking to understand their body composition and monitor their fitness progress. By entering specific measurements like weight, height, waist, and hip circumferences, the calculator estimates your body fat percentage, offering insights into your health and fitness levels. This information is crucial for designing effective diet and exercise plans tailored to your needs. Whether you aim to lose weight, build muscle, or maintain a healthy lifestyle, knowing your body fat percentage helps set realistic goals and track improvements, contributing to overall well-being and optimal health.

How to Use the Body Fat Calculator

Step 1: Select Your Gender

Locate the gender selection section at the top. Click on either the “Male” or “Female” button.

Step 2: Enter Your Weight

Find the “Enter Weight” field. Enter your weight and select the unit (kg or lbs) from the dropdown menu.

Step 3: Enter Your Waist Circumference

Locate the “Enter Waist Circumference” field. Enter your waist circumference and select the unit (cm or inches) from the dropdown menu.

Step 4: Enter Your Neck Circumference

Find the “Enter Neck Circumference” field. Enter your neck circumference and select the unit (cm or inches) from the dropdown menu.

Step 5: Enter Your Height

Locate the “Enter Height” field. Enter your height and select the unit (cm or inches) from the dropdown menu.

Step 6: Enter Your Age

Find the “Enter Age” field. Enter your age in the appropriate box.

Step 7: Calculate Body Fat Percentage

Click the purple “Body Fat Percentage” button. Wait for the tool to process your input and display your body fat percentage result on the screen.

Body Fat Calculator Formula

The formula for calculating body fat percentage is:

Body Fat Percentage=495/1.0324−0.19077×log⁡10(waist−neck)+0.15456×log⁡10(height)−450

This formula helps estimate the percentage of body fat based on measurements of the waist, neck, and height.

Exercise Body Fat Categorization for men and women

CategoryMen (%)Women (%)
Essential Fat2-5%10-13%

Ideal Body Fat Percentages

Age GroupMen (%)Women (%)
20-39 years8-19%21-32%
40-59 years11-21%23-33%
60-79 years13-24%24-35%

Methods of Measuring Body Fat

1. Body Mass Index (BMI)

  • A simple calculation using height and weight.
  • BMI = weight (kg) / height (m²).

2. Skinfold Calipers

  • Measures the thickness of skinfolds at specific body sites.
  • Common sites: triceps, abdomen, and thigh.

3. Bioelectrical Impedance Analysis (BIA)

  • Sends a small electrical current through the body.
  • Measures resistance to estimate body fat percentage.

4. Dual-Energy X-ray Absorptiometry (DEXA)

  • Uses low-level X-rays to differentiate between bone mass, lean mass, and fat mass.
  • Highly accurate and provides detailed body composition data.

5. Hydrostatic Weighing

  • Measures body density by submerging an individual in water.
  • Calculates body fat percentage based on water displacement.

6. Air Displacement Plethysmography (Bod Pod)

  • Measures body volume by displacing air in a sealed chamber.
  • Calculates body density and body fat percentage.

7. Magnetic Resonance Imaging (MRI) and Computed Tomography (CT) Scans

  • Provides detailed images of body tissues.
  • Can differentiate between types of fat (e.g., subcutaneous vs. visceral).

8. Near-Infrared Interactance (NIR)

  • Uses infrared light to measure fat and lean body mass.
  • Commonly used on the bicep.

9. Ultrasound

  • Uses sound waves to measure tissue thickness.
  • Can estimate body fat percentage.

10. 3D Body Scanners

  • Uses multiple cameras to create a 3D image of the body.
  • Estimates body composition based on the 3D model.

How to Reduce Body Fat

1. Healthy Diet

  • Balanced Nutrition: Focus on a diet rich in fruits, vegetables, lean proteins, whole grains, and healthy fats.
  • Calorie Control: Monitor and reduce caloric intake to create a calorie deficit.
  • Avoid Processed Foods: Limit consumption of sugary drinks, fast food, and high-fat snacks.

2. Regular Exercise

  • Cardiovascular Exercise: Engage in activities like running, cycling, swimming, or brisk walking for at least 150 minutes per week.
  • Strength Training: Incorporate weight lifting or resistance exercises 2-3 times per week to build muscle and boost metabolism.
  • High-Intensity Interval Training (HIIT): Combine short bursts of intense exercise with periods of rest to burn more calories in less time.

3. Adequate Sleep

  • Aim for 7-9 hours of quality sleep per night.
  • Poor sleep can disrupt hormones that regulate hunger and metabolism.

4. Stay Hydrated

  • Drink plenty of water throughout the day.
  • Sometimes thirst is mistaken for hunger, leading to unnecessary calorie intake.

5. Manage Stress

  • Practice stress-reducing activities like yoga, meditation, or deep breathing exercises.
  • Chronic stress can lead to weight gain through increased cortisol levels.

6. Consistency and Patience

  • Set realistic goals and be patient with the process.
  • Consistency in diet and exercise is key to long-term fat loss.

7. Monitor Progress

  • Keep track of your progress through measurements, photos, or body fat percentage assessments.
  • Adjust your diet and exercise routine as needed to continue making progress.

8. Seek Professional Guidance

  • Consult with a nutritionist or dietitian for personalized dietary advice.
  • Work with a personal trainer to create an effective workout plan tailored to your goals.

When does your body burn fat?

Your body burns fat when you create a calorie deficit through diet and exercise. This typically happens during prolonged, moderate-intensity exercise and after glycogen stores are depleted.

What measurements are needed for a body fat calculator?

Common measurements include weight, height, waist circumference, hip circumference, and sometimes neck circumference.

Can body fat calculators be used for all ages?

Most body fat calculators are designed for adults. There are specialized calculators for children and adolescents, as their body composition differs from adults.

Do body fat calculators work for athletes?

Athletes may find standard body fat calculators less accurate due to their higher muscle mass. There are specific calculators designed for athletes that take muscle mass into account.

What is a good body fat percentage?

A good body fat percentage is 14-24% for men and 21-31% for women, varying by age and fitness level.

How does fat leave the body?

Fat leaves the body through metabolic processes, primarily as carbon dioxide exhaled from the lungs and water excreted in urine, sweat, and other bodily fluids.

What does fat do for your body?

Fat provides energy, supports cell growth, protects organs, insulates the body, and aids in the absorption of fat-soluble vitamins.

Are online body fat calculators free?

Many online body fat calculators are free to use, though some may offer premium features or more detailed analysis for a fee.