Why does the calculator show a different result from the scales?

Bioimpedance scales are sensitive to hydration (amount of water). The US Navy tape method often provides a more consistent and accurate result for tracking dynamics.

What percentage of body fat do you need for six-pack abs?

Usually, abs become visible when the body fat percentage is below 12% in men and below 18% in women.

Can the US Navy method be trusted?

Yes, this is one of the most accurate anthropometric methods. The error is about 3-4%, which is comparable to caliper measurement, but much simpler.

Fat percentage (US Navy)

An accurate method for estimating fat mass from body measurements

Gender

Age

Weight (kg)

Height (cm)

Neck (cm)

Waist (cm)

Hip circumference (cm)

Fill in all the parameters for calculation.
The waist should be wider than the neck.

Fat percentage:

Normal

Low Medium High

Total weight -

Fat mass -

Dry mass (without fat) -

US Navy formula.
Method standard error: 1-3%.

Body Fat Percentage (BFP)

📉 Find out the real composition of your body

The scale can be deceiving: losing weight doesn't always mean losing fat. Our calculator uses the US Navy Method, the gold standard for home measurements, requiring only a measuring tape.

📏 How to measure correctly (Important!)

Больше по теме: Calculation of body mass index (BMI): formula and table of WHO norms

Water norm💧 How much water do you really need to drink? Forget the “8 glasses a day” myth. The need for water is individual and depends on your weight, activity and even the weather outside the window.

WHR⚖️ What is the WHR index and why calculate it? WHR (Waist-to-Hip Ratio) is the ratio of waist circumference to hip circumference.

Waist:measure at the narrowest point (or at the level of the navel), without pulling in the stomach.
Neck: measure under the Adam's apple, the tape should slope slightly down in front.
Hips (for women):at the widest part of the buttocks.
Tip: Take measurements in the morning on an empty stomach for maximum accuracy.

Table of body fat norms

Compare the result with generally accepted standards:

Category	Men	Women
Minimum required	2-5%	10-13%
Athletes	6-13%	14-20%
Fitness (Good shape)	14-17%	21-24%
Medium level	18-24%	25-31%
Obesity	25%+	32%+

What to do with the result?

Knowing your body fat percentage is just the beginning:

If the percentage is high, create an energy deficit. Calculate your norm using calorie calculator.
Watch not only your fat, but also your overall body weight so as not to lose muscle instead of fat.

Frequently asked questions (FAQ)

🔹 Why is the result different from smart scales?

The scale uses a bioimpedance method (current through the body), which is highly dependent on the amount of water in the body. The US Navy method (tape measurements) is often more accurate because it does not depend on how much water you drank before weighing.

🔹 What percentage of body fat is considered ideal?

There is no universal ideal. For health, it is recommended for men to maintain a level of 14-17%, for women - 21-24%. To draw abs ("cubes"), men need to go below 12%, women - below 18%.

🔹 How often should measurements be taken?

We recommend measuring your body fat percentage once every 2 weeks. Fat tissue is lost slowly, and more frequent measurements may not show a difference, which reduces motivation.