[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"hesap-icerik:body-fat-calculator":3,"seo-meta:\u002Fen\u002Ftools\u002Fbody-fat-calculator":35},{"icerik":4},{"slug":5,"sections":6,"faq":19},"body-fat-calculator",[7,11,15],{"id":8,"title":9,"html":10},"how-this-calculation-works","How this calculation works","\u003Cp>This tool uses the US Navy circumference method, developed in the 1980s so that body composition could be estimated in the field with nothing but a tape measure. It compares the girth of places where fat gathers with your height, and reads a percentage out of the relationship.\u003C\u002Fp>\n\u003Cp>For men the inputs are waist and neck. For women the hip is added, because fat distribution differs and the two group formulas were fitted separately:\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Men:\u003C\u002Fstrong> 495 ÷ [1.0324 − 0.19077 × log10(waist − neck) + 0.15456 × log10(height)] − 450\n\u003Cstrong>Women:\u003C\u002Fstrong> 495 ÷ [1.29579 − 0.35004 × log10(waist + hip − neck) + 0.221 × log10(height)] − 450\u003C\u002Fp>\n\u003Cp>Under that, afiet also reports your fat free mass: total weight minus the estimated fat. It is the part of you that muscle, bone, organs and water make up, and it usually moves more slowly and more meaningfully than the percentage itself.\u003C\u002Fp>\n\u003Cp>If the measurements produce a value outside a plausible band, roughly 3% to 70%, afiet shows no number at all. A reading outside that band is far more likely to be a mismeasured tape than a real body, and printing it anyway would be the wrong kind of confidence. Everything runs in your browser; no measurement is sent to us.\u003C\u002Fp>\n",{"id":12,"title":13,"html":14},"how-to-read-your-result","How to read your result","\u003Cp>Expect a margin of about three to four percentage points against a laboratory method such as DEXA. That margin is fine for the job this number actually does, which is showing direction over time, and useless for the job people usually want it to do, which is producing a precise figure to compare against someone else.\u003C\u002Fp>\n\u003Cp>To get a reading you can trust, keep the conditions the same: same time of day, ideally in the morning before eating, tape snug against the skin without compressing it, standing relaxed and breathing normally. A tape pulled tighter than last month will manufacture progress that did not happen.\u003C\u002Fp>\n\u003Cp>You will notice afiet does not show a band with labels like "athletic" or "ideal". That is deliberate. Those bands vary between sources, they are built on small samples, and a healthy percentage differs by age, sex, ethnicity and what your body is being asked to do. We give you the number and the direction, and leave the interpretation to you and a professional who can see the rest of the picture.\u003C\u002Fp>\n\u003Cp>If you want a fuller view, read this alongside your waist measurement itself, which is one of the better simple signals available, and alongside how your energy, sleep and strength are doing.\u003C\u002Fp>\n",{"id":16,"title":17,"html":18},"turning-the-percentage-into-plate-language","Turning the percentage into plate language","\u003Cp>A composition estimate is most useful when it changes something about the day. In afiet, it does exactly one thing: when your fat free mass is known, the protein suggestion is calculated from that instead of your total weight, which is the more sensible basis.\u003C\u002Fp>\n\u003Cp>Everything else stays in the language of the table. Your daily portions come out as palms, fists, cupped hands and thumbs, five food groups fill in with colour as the day goes on, and there are no numbers to chase. A tape measure once a month and a plate that makes sense every day will outperform a daily percentage every time.\u003C\u002Fp>\n",[20,23,26,29,32],{"q":21,"a":22},"How accurate is the US Navy body fat method?","It carries roughly a three to four point margin against laboratory methods. Measured consistently it tracks direction well, which is what it is good for.",{"q":24,"a":25},"Why do women need a hip measurement and men do not?","The two formulas were fitted separately on male and female samples, and the female equation uses hip circumference to account for a different fat distribution pattern.",{"q":27,"a":28},"Where exactly do I measure my waist?","At the level of your navel, standing relaxed, without holding your breath or pulling the tape tight. Measure at the same point every time.",{"q":30,"a":31},"What is fat free mass?","Everything in your body that is not fat: muscle, bone, organs and water. It is the number that tends to matter when you are training, and it moves more slowly than weight.",{"q":33,"a":34},"Why does afiet not tell me if my percentage is good?","Because a healthy range depends on your age, sex, background and what your body is for. We show the number and the direction; a professional who can see all of you is better placed to judge it.",{"path":36,"title":37,"description":38,"canonical":39,"robots":40,"ogTitle":41,"ogDescription":42,"ogImage":43,"ogImageAlt":44,"ogUrl":39,"ogSiteName":45,"ogLocale":46,"twitterSite":40,"themeColor":47,"verification":48,"jsonld":50,"faq":96,"ogType":97,"alternates":98},"\u002Fen\u002Ftools\u002Fbody-fat-calculator","Body fat calculator (US Navy method) | afiet","Estimate your body fat percentage and fat free mass from waist, neck and hip measurements. A tape measure is enough. No judgmental bands, no \"ideal\" label.","https:\u002F\u002Fafiet.co\u002Fen\u002Ftools\u002Fbody-fat-calculator","","What is your body fat percentage?","Body fat and fat free mass from tape measurements. We show the number and the direction, not a verdict.","https:\u002F\u002Fafiet.co\u002Fog.png","afiet. Sayma, dengele. 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