---
title: "Body Fat Calculator - Calculate Your Body Fat Percentage"
url: https://stacklist.com/card/5cc529f7-ae66-43b8-9fae-9fd597484133
source_url: "https://myfatcalc.com/"
stack: https://stacklist.com/stack/9ea4cbfc-53b1-4a25-b29d-da6c3c6a8384
summary: "Myfatcalc is a free online body fat calculator that uses four scientifically validated methods (CUN-BAE, U.S. Navy, BMI, and Jackson-Pollock) to estimate body fat percentage and provide personalized weight goals. The tool prioritizes privacy by keeping all measurements local to the browser and offers comparison features across different calculation methods."
tags: "body-fat-calculator, fitness-tool, health-measurement, bmi, body-composition, wellness"
key_entities: "CUN-BAE (technology), U.S. Navy method (technology), Jackson-Pollock (technology), BMI (technology), Clinica Universidad de Navarra (organization), ACE (organization), body fat percentage (concept), lean mass (concept)"
classification: "reference"
content_hash: "sha256:b31a3b28e97ccab49caf212ce983b671f1f85ae1f275444d3348409f2e926cc9"
acp_version: "0.2"
token_counts_approximate: 2312
visibility: public
agent_accessible: true
status: "final"
---

# Body Fat Calculator - Calculate Your Body Fat Percentage

Free Online Tool Free Body Fat Calculator Estimate your body fat using scientifically validated formulas: CUN-BAE , U.S. Navy , BMI , and Jackson-Pollock . Get your body fat category, lean mass, and personalized weight goals. 4 methods From quick estimates to tape and skinfold workflows Private by design Measurements stay in the browser and recent history stays local Built for comparison Switch methods and units without losing context Enter Your Details Clear Your body measurements stay in your browser. We do not upload or store your height, weight, or circumference inputs on our servers. CUN-BAE Most Popular U.S. Navy BMI Skinfold Most popular. Uses BMI, age, and sex for a reasonable estimate. Accuracy: ~4.7% Units: imperial metric Gender male female Age Height (in) in Weight (lb) lb CUN-BAE Method The Clinica Universidad de Navarra Body Adiposity Estimator uses your BMI, age, and sex to estimate body fat percentage without tape measurements. Best for: Quick estimates when you only know height, weight, age, and gender. Accuracy: At-home formula estimates may vary compared with clinical methods. Best used for tracking trends over time. How to Measure 1 Weigh yourself in the morning before eating, after using the bathroom. 2 Measure height without shoes, standing tall against a wall. 3 Use the same scale each time to reduce variability. 4 Track measurements weekly at the same time of day. Frequently Asked Questions What is a healthy body fat percentage? How often should I measure my body fat? Why do different methods give different results? Method Comparison Method Inputs Accuracy note CUN-BAE Height, weight, age, sex Formula estimate U.S. Navy Neck, waist, hip, height Technique matters BMI Height, weight, age, sex Broad estimate Skinfold 3 skinfold sites + age Technique matters At-home estimates can vary compared with clinical methods. All methods work best for tracking trends over time. Tips for Consistent Results • Measure at the same time of day (morning is best). • Use the same method every time — don't compare across methods. • Stay hydrated normally; dehydration skews readings. • Avoid measuring right after exercise (temporary fluid shifts). • Track over weeks, not days — weekly trends matter more than daily noise. • Take photos alongside measurements for a visual reference. Sample values — replace with yours Estimated Body Fat 0.0 % Average Athlete Fit Average Obese + Need a more precise reading? Smart scales and calipers can help you validate trends beyond formula-based estimates. See how recommendations are labeled Affiliate Disclosure: Some links on this page are affiliate links. If you buy through them, we may earn a small commission at no extra cost to you. This supports our free tools. Learn more . Body Fat Mass 37.9 lb Lean Mass 132.1 lb Ideal Body Fat 9.3% BMI 25.1 Goal Weight Suggestion To reach the Fitness category, aim to lose 10.8 lb while maintaining your lean body mass. Body Fat Categories (ACE) Essential Fat 10-13% 2-5% Athletes 14-20% 6-13% Fitness 21-24% 14-17% Average 25-31% 18-24% Obese 32%+ 25%+ Women Men Share Result Enter your measurements to share a real result Recent calculations Stored locally on this device only. 0/10 Your latest successful results will appear here for quick comparison. CUN-BAE Method The Clinica Universidad de Navarra Body Adiposity Estimator uses your BMI, age, and sex to estimate body fat percentage without tape measurements. Best for: Quick estimates when you only know height, weight, age, and gender. Accuracy: At-home formula estimates may vary compared with clinical methods. Best used for tracking trends over time. How to Measure 1 Weigh yourself in the morning before eating, after using the bathroom. 2 Measure height without shoes, standing tall against a wall. 3 Use the same scale each time to reduce variability. 4 Track measurements weekly at the same time of day. Frequently Asked Questions What is a healthy body fat percentage? How often should I measure my body fat? Why do different methods give different results? Method Comparison Method Inputs Accuracy note CUN-BAE Height, weight, age, sex Formula estimate U.S. Navy Neck, waist, hip, height Technique matters BMI Height, weight, age, sex Broad estimate Skinfold 3 skinfold sites + age Technique matters At-home estimates can vary compared with clinical methods. All methods work best for tracking trends over time. Tips for Consistent Results • Measure at the same time of day (morning is best). • Use the same method every time — don't compare across methods. • Stay hydrated normally; dehydration skews readings. • Avoid measuring right after exercise (temporary fluid shifts). • Track over weeks, not days — weekly trends matter more than daily noise. • Take photos alongside measurements for a visual reference. Sources & Methodology MyFatCalc estimates body fat with published equations and established category ranges. Results are formula estimates, so compare trends using the same method and measurement routine. CUN-BAE Uses BMI, age, and sex based on the Clinica Universidad de Navarra Body Adiposity Estimator equation. Gomez-Ambrosi et al., Diabetes Care, 2012 U.S. Navy Uses height and circumference measurements derived from the Navy body composition assessment work by Hodgdon and Beckett. Hodgdon & Beckett, Naval Health Research Center, 1984 BMI Body Fat Estimates body fat from BMI, age, and sex using the Deurenberg adult prediction equation. Deurenberg et al., British Journal of Nutrition, 1991 Jackson-Pollock 3-site Uses gender-specific three-site skinfold measurements and age with Jackson, Pollock, and Ward body density equations. Jackson & Pollock, 1978; Jackson, Pollock & Ward, 1980 Women's equation source ACE Categories Classifies results into Essential Fat, Athletes, Fitness, Average, and Obese ranges using American Council on Exercise reference categories. American Council on Exercise Last updated: June 3, 2026 This tool provides estimates for informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Consult a qualified healthcare provider for personalized guidance. Why Trust MyFatCalc? Peer-Reviewed Formulas All calculations are based on published research from the Naval Health Research Center, CUN-BAE study, and ACE standards. Multiple Methods Choose from 4 validated methods depending on what measurements you have available. Private & Free No account required. All calculations happen in your browser, and measurement inputs are not uploaded to our servers. Quick Guide CUN-BAE Best default. Just height, weight, age, and gender. U.S. Navy Most accurate. Needs tape measurements. BMI Simplest estimate. Less accurate for muscular people. Jackson-Pollock Needs skinfold calipers. Great for home tracking. Related Tools For Women Open For Men Open By Age Open For Athletes Open Navy Method Open Understanding Body Fat Percentage Body fat percentage is the proportion of your total body weight that is made up of fat tissue. Unlike BMI, which only considers height and weight, body fat percentage gives you a more accurate picture of your body composition. Why Body Fat Matters Your body needs some fat to function properly. This is called essential fat . It helps regulate hormones, insulates your body, and protects vital organs. However, excess body fat, especially visceral fat around your organs, is linked to increased risk of heart disease, type 2 diabetes, and other health conditions. How Accurate Are These Calculators? Each method has a different margin of error. The U.S. Navy method is generally the most accurate tape-measure approach. The CUN-BAE method offers a good balance of accuracy and convenience. For the most precise measurement, methods like DEXA scans or hydrostatic weighing are required in a clinical setting. How to Measure Correctly For Tape Measure Methods Use a non-stretchable tape measure Measure against bare skin Keep tape parallel to the floor Do not compress the skin Take measurements in the morning For Skinfold Methods Use professional calipers if possible Pinch skin and subcutaneous fat, not muscle Take 2-3 measurements per site and average Measure from the right side of the body Have someone help with hard-to-reach areas Frequently Asked Questions What is a healthy body fat percentage? For women, a healthy range is typically 21-31% and for men it's 14-24%. Athletes may be lower, but lower is not automatically healthier for everyone. Which body fat calculation method is most accurate? The U.S. Navy method is usually the strongest tape-measure option at home. CUN-BAE is a strong default when you only have height, weight, age, and sex. Can I have a low body fat percentage but high BMI? Yes. BMI does not distinguish muscle from fat, so muscular people can show a high BMI while still having a healthy body fat percentage. How often should I measure my body fat? Most people get better signal from measuring every 2 to 4 weeks under similar conditions instead of checking daily. Why do men and women have different healthy ranges? Women naturally carry more essential fat because of biological and hormonal differences, so the reference ranges are higher than for men.