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Body Fat Calculator
Check your body composition
All measurements should be in centimetres (cm) or kilograms (kg). Take your measurements first, then enter them below.
Important: If you have concerns about your relationship with food, exercise, or body image, please speak with your GP or contact the Butterfly Foundation or Healthdirect helpline. This tool is not suitable for use if you are currently being treated for an eating disorder.
Gender
Biological sex affects essential body fat requirements and changes the calculation formula.
Used to calculate the average body fat level for your specific age bracket.
Used to determine your overall body mass.
Stand up straight without shoes to get an accurate measurement.
Circumference Measurements
Measure just below the Adam's apple, keeping the tape flat but not painfully tight.
For men, measure directly at the navel. For women, measure at the narrowest point of the waist.
Estimates only – for general information purposes. Not a substitute for professional medical advice. Results vary by individual. Read the full disclaimer below.
Understanding your body fat percentage
Have you ever exercised regularly in the gym, followed a healthy diet, and still felt disappointed when you stepped on the scale? You’re not alone. The problem is that the scale does not tell the whole story.
A standard bathroom scale measures everything at once: water, bones, organs, and muscle. It cannot tell you how much of your weight is fat. That’s why tracking your body fat percentage gives you a clearer picture of your overall health and fitness. It measures the proportion of your body weight made up of fat, which can be divided into two main types:
Essential Fat
The minimum fat your body needs to survive. It is found in your nerves, brain, and bone marrow. It regulates hormones and supports reproductive functions. For men, essential fat is roughly 2-5%, and for women, it is 10-13%.
Storage Fat
What is a healthy body fat percentage?
BMI vs Body Fat: What is the difference?
Body mass index (BMI) is one of the most commonly used measures of health, but it has some limitations.
BMI only compares your weight with your height, ignoring whether that weight comes from muscle or fat. That’s why a professional rugby player weighing 105 kg might be classified as obese on a BMI chart, despite having very little body fat. Likewise, someone may have a BMI within the healthy range but still carry large amounts of dangerous visceral fat around their organs. Often described as “skinny fat”, this body composition may increase metabolic health risks even when body weight appears normal.
Using a body fat calculator provides a helpful estimate of your body composition. Along with BMI, it can serve as a useful screening measure to give you insight into potential health risks.
How to take accurate measurements at home
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Rule 1: Use a flexible, non-stretch fiberglass tape measure. Fabric tape measures may stretch over time, affecting your readings.
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Rule 2: Keep the tape snug, not tight. Ensure the tape sits flat against your skin without compressing the flesh.
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Rule 3: Measure under the same conditions every time. Ideally, measure first thing in the morning before eating, drinking, or exercising. Hydration and muscle pumps can alter your measurements.
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Rule 4 (For Women): Avoid measuring on days of heavy water retention. Certain phases of your menstrual cycle can cause bloating and water retention. This can artificially inflate your waist measurement and change your results.
How is your body fat calculated?
The most accurate ways to measure body fat, such as DEXA scans or hydrostatic weighing, are expensive and require a specialist clinic. Most people do not have easy access to them.
The Hola Health Body Fat Calculator uses the scientifically validated U.S. Navy Method. It was developed for the United States Navy and has since been widely adopted by health professionals worldwide.
The formula calculates your body fat percentage using simple tape measurements of your neck, waist, and hips. Research indicates that the U.S. Navy method typically comes within 3-4 percentage points of a DEXA scan, making it a reliable option for tracking your progress over time.
Comparing body fat measurement methods
| Method | Accuracy | Cost | Difficulty | Best for |
|---|---|---|---|---|
| Navy Tape | Moderate | Free | Easy | Tracking progress over time |
| Skinfold Calipers | Moderate-high | Low | Moderate | Home use with practice |
| Smart Scales (BIA) | Low | Low-moderate | Easy | Convenient and useful |
| DEXA Scan | Very high | High | Moderate | Clinical-grade body composition |
For most Australians, the Navy Tape Method is the most practical starting point. It is free, easy, and accurate enough to track progress over time.
4 Tips for managing and lowering body fat
- Focus on Resistance Training: Building muscle increases your resting metabolic rate. This means you burn more calories even while sitting still.
- Prioritise Protein: A high-protein diet helps preserve lean muscle mass while in a calorie deficit.
- Target Visceral Fat with Cardio: Moderate aerobic exercise, such as brisk walking, cycling, or swimming, is highly effective at reducing dangerous belly fat. Consistency matters more than intensity.
- Consult a Healthcare Professional: If diet and exercise aren’t working, speak to a doctor about weight-management options, metabolic blood tests, or a referral to a dietitian.
Body fat and composition FAQs
1. How accurate is a tape-measure body fat calculator?
A tape-measure body fat calculator using the U.S. Navy method is a reasonably reliable free, at-home tool. It is usually accurate within 3-4 percentage points of a clinical DEXA scan when measurements are taken correctly. For best results, measure at the same time of day.
2. Is 20% body fat good?
Whether 20% is considered a healthy target depends on several factors, including your sex, age, personal health history, and the measurement method used. As a general benchmark, 20% often falls within an acceptable range for men and an athletic range for women. However, an online calculator only provides an estimate and should not be used on its own to judge your overall health.
3. What is a dangerous body fat percentage?
For men, a body fat percentage above 25% is generally classified as obesity. For women, 32% or higher is considered high risk. Higher body fat levels are linked to an increased risk of conditions such as heart disease, type 2 diabetes, high blood pressure, sleep apnoea, and other metabolic disorders.
4. Can you have too little body fat?
Yes. Having too little body fat can be harmful to your health. Men should generally not fall below 5%, while women should avoid dropping below 13%. Very low body fat can affect hormone production, weaken the immune system, reduce bone density, increase the risk of injury, and, in severe cases, lead to organ damage.
5. Why do women naturally have a higher body fat percentage?
Women require higher levels of essential body fat to support reproductive health, oestrogen production, and a healthy menstrual cycle. If body fat becomes too low, some women may experience irregular periods or amenorrhoea (the loss of menstrual periods).
6. How can I lose body fat without losing weight?
Your body can lose body fat without losing weight through body recomposition. This means reducing fat while building lean muscle at the same time. It involves eating at roughly your maintenance calorie level while following a structured strength-training programme and a high-protein diet.
7. What is visceral fat versus subcutaneous fat?
Subcutaneous fat sits directly beneath your skin and is the fat you can pinch. Visceral fat surrounds your internal organs deep inside the abdomen and poses a much greater risk to your health. Visceral fat is more dangerous as it is linked to heart disease, type 2 diabetes, and inflammation.
8. Can an online doctor help with weight loss?
Australian telehealth doctors can assess your health, provide tailored advice to support healthy weight management, request metabolic blood tests, and let you know if further investigation or specialist referral is appropriate.
General Disclaimer: Estimates only. This calculator uses the standard U.S. Navy circumference algorithm – internally validated for accurate metric and imperial conversions to provide a general estimate of body composition.
It cannot account for bone density, hydration levels, or certain medical conditions. This tool does not provide medical advice or diagnosis. Always discuss your weight, diet, and overall health with your GP or a qualified healthcare professional.
See a doctor today
Book a telehealth appointment with an Australian-registered doctor to discuss your overall health, request metabolic blood tests if clinically appropriate, or talk through your options.
