Body Fat Calculator

Body Fat Calculator for Accurate Body Fat Percentage

Body Fat Calculator

Use this Body Fat Calculator to estimate your body fat percentage using a few simple measurements. Choose Metric Units if you prefer centimeters and kilograms (SI units).

For the most accurate result, measure carefully and keep your numbers consistent:

• Round to the nearest 0.5 cm (or 1/4 inch if using US units)
• Stand relaxed and keep the tape snug, not tight

This calculator uses the US Navy method and also shows a BMI-based estimate so that you can compare results in one place. Both methods are explained below.

How to use the calculator

• Select your unit system (US, Metric, or Other).
• Choose your gender and enter your age.
• Add your height and weight.
• Enter your body measurements (such as neck and waist).
• Click Calculate to see your results instantly.

What you’ll see in your results

After you calculate, you’ll get a clear breakdown, such as:

• Body fat percentage
• Body fat category (like Fitness, Average, etc.)
• Body fat mass (fat weight)
• Lean body mass (everything that isn’t fat)
• Estimated ideal body fat for your age
• Fat to lose to reach the perfect range
• BMI method body fat estimate (for comparison)

Quick note about accuracy

A calculator gives a strong estimate, but your result can change based on:

• How accurately you measure
• Where do you place the tape
• Hydration and recent meals
• Natural body shape differences

If you want a more precise reading, you can compare this estimate with methods like skinfold testing, DEXA scans, or professional body composition analysis.

Understanding body fat in simple terms

Body fat is also called adipose tissue. It’s not “bad” by default—your body needs fat to function well. It helps:

• Store energy for later use
• Support hormones and metabolism
• Protect organs and keep you warm

There are two main types of body fat:

Essential fat

It is the minimum fat your body needs for normal health and basic functions. It supports organs and, in women, reproductive health. Typical ranges are:

• Men: about 2–5%
• Women: about 10–13%

Storage fat

That is the extra fat your body stores under the skin and around organs. A healthy amount is normal, but too much can increase health risks. Body fat, overweight, and obesity Having extra body fat can lead to being overweight and, over time, obesity—especially if the trend continues. But body weight alone doesn’t tell the full story.

Your weight includes:

• Fat
• Muscle
• Bone density
• Water

That’s why some muscular people may fall into an “overweight” range on the scale, even with a healthy body fat percentage.