If you are buying one for a gym, clinic or wellness programme \u2014 or wondering whether the reading you got last week meant anything \u2014 this guide covers how these machines work, which specifications determine reliability, and what body fat percentage actually means for Indian bodies.<\/p>\n Nearly every body fat analyzer sold in India uses bioelectrical impedance analysis<\/strong>. A small, painless alternating current passes through the body. Muscle tissue is roughly three-quarters water and conducts the current readily. Fat tissue holds very little water and resists it. Measuring that resistance lets the device separate lean tissue from fat.<\/p>\n That is the principle. The execution is where devices diverge, in three ways that matter.<\/p>\n A foot-to-foot device \u2014 most bathroom scales claiming body fat \u2014 sends current up one leg and down the other. It never reaches your upper body. Everything it reports about your arms and trunk is inferred, not measured. A device using tetrapolar 8-point tactile electrodes<\/strong> contacts both hands and both feet, so current travels through the whole body and each segment is measured directly.<\/p>\n Single-frequency current cannot distinguish water inside cells from water outside them. Multi-frequency devices can \u2014 the InBody 270S uses three frequencies at 20, 50 and 100 kHz, while the clinical 770S uses six from 1 kHz to 1,000 kHz. This matters because fluid shifts are a common source of misleading body fat readings.<\/p>\n This is the decisive one. Many analysers apply corrections based on your age, sex or ethnicity, filling in values from population averages and presenting the blend as a measurement. InBody devices calculate directly from measured impedance per segment, without those corrections.<\/p>\n The test for this is simple. If two people of the same age, sex, height and weight get near-identical body fat readings despite one being a trained athlete, the device is describing a demographic rather than a person.<\/p>\n Body fat percentage is more informative than weight and far more informative than BMI. But the reference ranges most commonly quoted online are drawn from Western populations, and applying them directly to Indian bodies understates risk.<\/p>\n Indians tend to carry more body fat and less skeletal muscle at any given BMI than Caucasian populations \u2014 a pattern widely documented as the thin-fat phenotype. This is why ICMR and WHO Asia-Pacific guidance uses lower BMI cut-offs for Indians: overweight from 23 rather than 25, obesity from 25 rather than 30.<\/p>\n The practical implication is significant. A large number of Indian adults sit at a perfectly normal body weight and BMI while carrying an elevated body fat percentage and a meaningful visceral fat load. Their scale reassures them. Their body composition does not. Detailed ranges by age and sex are covered in our body fat percentage chart for Indian men and women<\/a>.<\/p>\n Total body fat percentage is a useful summary. Visceral fat is the number with the sharper clinical edge.<\/p>\n Subcutaneous fat sits under the skin. Visceral fat sits deeper, packed around the abdominal organs, and it is metabolically active in ways subcutaneous fat is not \u2014 associated with insulin resistance, metabolic syndrome and cardiovascular risk. A clinical-grade analyser reports it as a level or as visceral fat area in cm\u00b2, where above 100 cm\u00b2 is the recognised threshold for elevated metabolic risk.<\/p>\n Two people can share an identical total body fat percentage with very different visceral fat loads and very different risk profiles. A device reporting only a single whole-body fat figure cannot make that distinction. More detail in visceral fat normal range and risks<\/a>.<\/p>\n Even an excellent device produces poor data under inconsistent conditions. Bioelectrical impedance responds to hydration, and hydration moves throughout the day.<\/p>\n None of this makes the device unreliable. It means the protocol is part of the measurement. A body fat reading taken under consistent conditions every eight weeks tells you something real. Readings taken randomly tell you mostly about water.<\/p>\n Skinfold calipers remain in use and are inexpensive, but they measure subcutaneous fat at a handful of sites and infer the total. Results depend heavily on the skill of the person taking them, and they cannot assess visceral fat at all \u2014 which is the measure that matters most for Indian metabolic risk.<\/p>\n Consumer bathroom scales are convenient for tracking a rough trend at home, provided you accept that upper-body values are inferred. For anything where a real decision follows the number \u2014 a clinical assessment, a training programme, a corporate screening \u2014 a professional segmental analyser is the appropriate instrument. The full comparison is in InBody vs DEXA vs calipers<\/a> and professional vs home analysers<\/a>.<\/p>\n![\"InBody](\"https:\/\/www.inbody.in\/blog\/wp-content\/uploads\/2026\/08\/inbody-370s-body-composition-analyzer.jpg\")
How Body Fat Analyzers Work<\/h2>\n
Where the current enters and exits<\/h3>\n
How many frequencies it uses<\/h3>\n
Whether it estimates<\/h3>\n
Body Fat Percentage: What the Number Means for Indians<\/h2>\n
![\"InBody](\"https:\/\/www.inbody.in\/blog\/wp-content\/uploads\/2026\/08\/inbody-270-body-composition-analyzer.jpg\")
Why Visceral Fat Matters More Than Total Body Fat<\/h2>\n
What to Look For When Buying<\/h2>\n
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\n \nSpecification<\/th>\n What to require<\/th>\n Why<\/th>\n<\/tr>\n<\/thead>\n \n Electrode contact<\/td>\n 8-point tactile, hands and feet<\/td>\n Foot-to-foot devices cannot measure the upper body at all<\/td>\n<\/tr>\n \n Electrode configuration<\/td>\n Tetrapolar<\/td>\n Separates current-injecting from voltage-sensing electrodes, removing skin resistance from the result<\/td>\n<\/tr>\n \n Frequencies<\/td>\n 3 minimum<\/td>\n Separates intracellular from extracellular water<\/td>\n<\/tr>\n \n Empirical estimation<\/td>\n None<\/td>\n Results should reflect the person, not their demographic<\/td>\n<\/tr>\n \n Segmental output<\/td>\n All 5 segments<\/td>\n Whole-body averages conceal asymmetry<\/td>\n<\/tr>\n \n Visceral fat<\/td>\n Reported explicitly<\/td>\n The clinically meaningful fat measure<\/td>\n<\/tr>\n \n Validation<\/td>\n Published DEXA correlation<\/td>\n InBody professional devices report 98%; the 770S reports 99%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Getting a Reading You Can Trust<\/h2>\n
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Calipers, Scales and Analysers Compared<\/h2>\n