Waist
Stand relaxed, exhale normally, and wrap the tape around the waist without pulling it tight. Keep the tape parallel to the floor. For men, many body fat calculators use the level of the navel. For women, many calculators use the natural waist.
Body composition tool
Body Fat Calculator
Estimate body fat percentage with the U.S. Navy formula, then see lean body mass, body fat mass, total body water, BMR, and TDEE in one place.
Metric & imperial
Men & women
Lean mass & fat mass
Body fat chart
Body Fat %—
Lean Body Mass—
Body Fat Mass—
Body Fat Category—
Underfat< 8%
Fit8%–20%
Acceptable20%–25%
Obese> 25%
Enter measurements to see your category.
Advanced stats
BMR—
TDEE—
Total Body Water—
Reference
Men: Underfat < 8%, Fit 8%–20%, Acceptable 20%–25%, Obese > 25%.
The in-calculator category bar uses practical general ranges. Scroll down for the detailed body fat chart for men and women.
Body fat chart
Body fat percentage chart for men and women
Use this body fat chart as a general reference for adults. Women naturally carry more essential fat than men, so healthy ranges are not the same. This chart is helpful when you want to understand whether your calculator result looks athletic, fitness-oriented, average, or obese rather than focusing only on body weight.
| Category | Men | Women | What it usually means |
|---|---|---|---|
| Essential fat | 2%–5% | 10%–13% | Minimum fat needed for normal physiological function. |
| Athletes | 6%–13% | 14%–20% | Often seen in highly trained people and some competitive sports. |
| Fitness | 14%–17% | 21%–24% | A common target zone for people focused on performance and physique. |
| Average | 18%–24% | 25%–31% | A broad everyday range for many adults. |
| Obese | 25%+ | 32%+ | A higher-fat range often linked with higher long-term health risk. |
If you are using this body fat calculator for goal setting, think in ranges, not a single perfect number. Long-term trend lines usually matter more than one isolated reading.
Measurement guide
How to measure waist, neck, and hip correctly
Neck
Measure just below the larynx with the tape level around the neck. Keep your shoulders relaxed and avoid lifting the chin too high.
Hip
For women, measure the widest part of the hips and glutes. Make sure the tape stays straight and does not angle upward or downward.
Best practice
Use the same tape, the same time of day, and the same body position every time. If your goal is fat loss, consistent measurement technique is more useful than chasing perfect precision.
Formula
U.S. Navy body fat formula used in this calculator
This body fat percentage calculator uses the circumference-based U.S. Navy method because it is fast, repeatable, and practical for home use. The equations below are shown so you can understand how the body fat estimate is generated.
Men
Body Fat % = 495 / (1.0324 − 0.19077 × log10(waist − neck) + 0.15456 × log10(height)) − 450
Inputs: height, waist, and neck. Measurements must use the same unit system.
Women
Body Fat % = 495 / (1.29579 − 0.35004 × log10(waist + hip − neck) + 0.22100 × log10(height)) − 450
Inputs: height, waist, neck, and hip. Measurements must use the same unit system.
Fat mass
Fat Mass = Body Weight × (Body Fat % ÷ 100)
Useful when you want to see how much of your body weight is estimated fat mass.
Lean body mass
Lean Mass = Body Weight − Fat Mass
Useful for training, protein planning, and body composition tracking.
Worked examples
Example body fat calculator results
Example 1: male body fat percentage
Inputs: age 28, height 180 cm, weight 75 kg, waist 86 cm, neck 38 cm.
- Estimated body fat: 16.9%
- Estimated fat mass: 12.7 kg
- Estimated lean mass: 62.3 kg
- Estimated BMR: 1,872 kcal/day
Example 2: female body fat percentage
Inputs: age 30, height 165 cm, weight 62 kg, waist 74 cm, neck 32 cm, hip 97 cm.
- Estimated body fat: 27.9%
- Estimated fat mass: 17.3 kg
- Estimated lean mass: 44.7 kg
- Estimated BMR: 1,483 kcal/day
Comparison
Body fat percentage vs BMI vs waist size
Many people search for a body fat calculator because scale weight alone does not tell the whole story. Two people can weigh the same and have very different body composition. That is why body fat percentage, BMI, and waist size each serve a different purpose.
| Measure | Best for | Main strength | Main limitation |
|---|---|---|---|
| Body fat % | Tracking body composition changes | Shows fat mass as a share of total weight | Still an estimate unless measured in a lab |
| BMI | Fast population-level screening | Very easy to calculate from height and weight | Does not separate fat from muscle |
| Waist circumference | Checking abdominal fat risk | Simple tape-measure check | Does not estimate total body fat percentage |
| DEXA / lab scan | Highest-detail body composition review | Most complete breakdown of fat and lean tissue | Costs more and is not always easy to access |
If your result is surprising, compare your body fat percentage with BMI, waist circumference, training history, and how your measurements change over time. That gives a more useful health and fitness picture than any one number by itself.
What to do next
How to use your body fat calculator result
For fat loss
If your body fat percentage is higher than your target range, focus on a sustainable calorie deficit, strength training, high-protein meals, daily movement, and long enough sleep to support recovery.
For recomposition
If your weight is stable but your body fat percentage is dropping, you may be losing fat while building or maintaining lean mass. Track waist measurements, progress photos, and performance in the gym.
For performance
Athletes often use body fat percentage to guide weight classes, seasonal physique changes, or conditioning phases. Do not chase very low body fat levels without proper supervision.
For health monitoring
Body fat percentage can be a useful long-term trend marker, especially when combined with waist circumference, blood pressure, nutrition habits, and regular medical checkups.
FAQ
Frequently asked questions
How is body fat percentage calculated on this page?
This calculator uses the U.S. Navy circumference method. For men, the estimate is based on height, waist, and neck. For women, it uses height, waist, neck, and hip. If weight is provided, the page also estimates fat mass, lean body mass, total body water, BMR, and TDEE.
Is a body fat calculator more useful than BMI?
Body fat percentage can add useful context because it estimates how much of your total weight is fat tissue, while BMI only compares weight with height. BMI is still a useful screening tool, but it does not separate fat mass from lean mass.
How accurate is the Navy body fat formula?
It is a practical estimate, not a lab test. Tape placement, posture, hydration, and body shape can affect the result. For trend tracking at home, it is useful when you measure the same way each time.
What measurements do I need for the body fat calculator?
You need age, sex, height, and circumference measurements. Men need waist and neck. Women need waist, neck, and hip. Weight is optional for body fat percentage itself, but it is needed for lean mass, fat mass, BMR, TDEE, and total body water estimates.
What body fat percentage is considered healthy?
General reference ranges differ for men and women. A common ACE-style chart places most healthy adult men around 14% to 24% and most healthy adult women around 21% to 31%, with athletic and essential-fat ranges below that and obesity ranges above that.
Can I use this calculator for global users?
Yes. The calculator supports metric and imperial units and explains the formulas, measurement method, and category chart in plain language for a broad international audience.
References
Sources used for the information on this page
This page was built using public references for the U.S. Navy formula, body fat category charts, BMI context, waist risk context, and method comparison guidance.