Body Fat Calculator

Free body fat percentage calculator using the US Navy method and BMI-based formula. Enter your measurements to get body fat %, fat mass, lean mass, and body fat category. Supports both imperial and metric units with visual category charts.

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How to Use Body Fat Calculator

1Select your gender and enter your age.
2Enter height, weight, neck, and waist measurements.
3For women, also enter hip circumference.
4View body fat %, category, and body composition breakdown.

Frequently Asked Questions

The US Navy method is accurate to within 3-4% for most people. For more precise measurements, consider DEXA scans or hydrostatic weighing.

For men: 10-20% is fitness range, 18-25% is acceptable. For women: 18-28% is fitness range, 25-31% is acceptable. Essential fat is 2-5% for men and 10-13% for women.

Measure your waist at the narrowest point (usually at the navel). Measure your neck just below the larynx (Adam's apple). Keep the tape level and snug but not tight.

Yes, the Body Fat Calculator is fully responsive and works perfectly on smartphones, tablets, and desktop computers. Simply open NexTool in your mobile browser and navigate to the tool — no app download required.

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About Body Fat Calculator

NexTool's Body Fat Calculator is completely free to use with no sign-up required. Your data is processed directly in your browser and never sent to our servers, ensuring complete privacy and instant results.

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<iframe src="https://getnextool.com/embed/body-fat-calculator" width="100%" height="600" frameborder="0" style="border:0;border-radius:12px;" loading="lazy" title="Body Fat Calculator - NexTool"></iframe>
<script>window.addEventListener('message',function(e){if(e.data&&e.data.type==='nextool-embed-resize'){var iframes=document.querySelectorAll('iframe[src*="getnextool.com/embed/"]');iframes.forEach(function(f){if(e.source===f.contentWindow)f.style.height=e.data.height+'px'})}});</script>

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Body Fat Calculator

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Biological Sex

Age (years)

Weight (lbs)

Height (ft & in)

Body Measurements (for US Navy Method)

Measure at the widest/narrowest point. Leave blank to use BMI-based estimate only.

Neck Circumference (inches)

Waist Circumference (inches)

Enter your age, weight, and height to estimate body fat using the BMI method. Add circumference measurements for a more accurate US Navy Method calculation.

Body Fat Categories (Male)

Essential Fat2% - 5%

Minimum fat needed for basic physiological function. Dangerously low for sustained periods.

Athletes6% - 13%

Typical range for competitive athletes. Very lean with visible muscle definition.

Fitness14% - 17%

Fit and healthy range. Good muscle definition with a lean, toned appearance.

Acceptable18% - 24%

Average range for the general population. Healthy but with room for improvement.

Obese25%+

Excess body fat associated with increased health risks. Consult a healthcare professional.

Healthy Body Fat Ranges by Age

Age Range	Male (Healthy)	Female (Healthy)
20-29	7-17%	16-24%
30-39	12-21%	17-25%
40-49	14-23%	19-28%
50-59	16-24%	22-31%
60+	17-25%	22-33%

Disclaimer

This calculator provides estimates based on mathematical formulas. The US Navy Method and BMI-based method are screening tools, not diagnostic measures. Accuracy varies based on individual body composition.

This is not medical advice. Body fat distribution, muscle mass, bone density, and other factors affect health outcomes beyond what these formulas can measure. For precise body fat measurement, consider methods such as DEXA scans, hydrostatic weighing, or professional calipers.

Always consult a healthcare professional before making significant changes to your diet or exercise routine.

Save your results

AI Analysis PRO

AI analysis detected patterns in your calculation. Personalized insights and recommendations available with Pro...

Unlock AI Insights — Free 7-Day Trial

Download PDF Report

Get detailed breakdowns, charts, and shareable PDF reports with Pro

PRO

Share your result

Share Y

Estimate Mortgage Generate Passwords Format JSON

Rate this tool

Analyze ingredient safety with AI

Check 10,000+ ingredients for safety — Pro starts at $9/mo

Learn more

Want more? Unlock the full experience

Pro members get the most out of Body Fat Calculator

PDF Reports

Download detailed reports with charts and breakdowns

AI Analysis

Get personalized insights and recommendations

Unlimited Access

No daily limits on any tool or calculator

Try Pro Free for 7 DaysThen $9.00/mo · Cancel anytime

Shop Body Composition Scales

Smart scales that track body fat, muscle mass, and more.

Shop Now

Sponsored · We may earn a commission at no cost to you

How to Use Body Fat Calculator

1Select your gender and enter your age.
2Enter height, weight, neck, and waist measurements.
3For women, also enter hip circumference.
4View body fat %, category, and body composition breakdown.

Frequently Asked Questions

The US Navy method is accurate to within 3-4% for most people. For more precise measurements, consider DEXA scans or hydrostatic weighing.

For men: 10-20% is fitness range, 18-25% is acceptable. For women: 18-28% is fitness range, 25-31% is acceptable. Essential fat is 2-5% for men and 10-13% for women.

Measure your waist at the narrowest point (usually at the navel). Measure your neck just below the larynx (Adam's apple). Keep the tape level and snug but not tight.

Get weekly tips for Body Fat Calculator & more

No spam. Unsubscribe anytime.

About Body Fat Calculator

Embed This Tool

Add Body Fat Calculator to your website. Paste the code below into your HTML. The iframe auto-resizes to fit the tool content.

Width

Height

px or %

<iframe src="https://getnextool.com/embed/body-fat-calculator" width="100%" height="600" frameborder="0" style="border:0;border-radius:12px;" loading="lazy" title="Body Fat Calculator - NexTool"></iframe>
<script>window.addEventListener('message',function(e){if(e.data&&e.data.type==='nextool-embed-resize'){var iframes=document.querySelectorAll('iframe[src*="getnextool.com/embed/"]');iframes.forEach(function(f){if(e.source===f.contentWindow)f.style.height=e.data.height+'px'})}});</script>

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