Calculate BMI, ideal weight range and body-fat percentage from height, weight, waist and neck measurements. Metric and imperial, all offline.
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Quick answer: BMI, Ideal Weight & Body Fat Calculator — BMI, ideal weight and body fat Free, no signup, runs in your browser. See below for the interactive tool, 4-step guide and FAQs.
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Both metric and imperial systems work with automatic conversion built inside. Seventy kilograms at 175 centimeters yields BMI 22.9, identical to 154 pounds at 68.9 inches using 703 times pounds divided by inches squared. Switching units preserves precision instantly. Entries remain local without transmission.
Categories map numeric BMI to four WHO ranges for screening context. Under 18.5 signals underweight, 18.5 to 24.9 signals normal, 25 to 29.9 signals overweight, and 30 and signals obesity. For example, 22.9 sits normal while 29.4 at 90 kilograms reads overweight. Athletic builds need waist context.
Healthy spans 18.5 to 24.9 for most nonpregnant adults, yet composition matters more than index alone. Seventy kilograms at 175 centimeters scores 22.9 normal, while 90 kilograms at identical height scores 29.4 overweight. Muscular lifters, pregnant people, and older adults should combine waist measurement with clinical guidance.
Muscle density elevates weight without excess adiposity, so lean lifters often land near 27 despite low waist. A 95-kilogram sprinter at 180 centimeters shows 29.3 overweight yet carries 12 percent body fat. Tracking waist under 94 centimeters men or 80 centimeters women and strength trends prevents misclassification.
Absolutely, central versus peripheral storage changes risk at identical index values. Two adults at 24.0 diverge when one holds 88-centimeter waist and another holds 104-centimeter waist with visceral accumulation. Combining BMI with waist-to-height ratio, activity pattern, and clinician review sharpens interpretation beyond solitary number.
Body Mass Index estimates weight-for-height using four WHO bands that contextualize population risk without diagnosing individual adiposity. Seventy kilograms at 175 centimeters scores 22.9 normal, while 90 kilograms at identical height scores 29.4 overweight, illustrating sensitivity to twenty-kilogram shifts. Reference table organizes thresholds | Category | BMI interval | Example profile | Underweight | below 18.5 | 50 kilograms at 175 centimeters equals 16.3 | Normal | 18.5 to 24.9 | 70 kilograms at 175 centimeters equals 22.9 | Overweight | 25 to 29.9 | 90 kilograms at 175 centimeters equals 29.4 | Obesity | 30 and | 100 kilograms at 175 centimeters equals 32.7. Edge case includes pregnancy and amputation, where standard height-weight logic misleads. Limitation ignores muscularity, bone density, and visceral distribution. This is general information only, not medical advice. See /terms and compare with the Ideal Weight tab above.
Metric formula divides kilograms by meters squared, imperial multiplies 703 times pounds divided by inches squared, converging on identical index. Seventy kilograms at 1.75 meters gives 70 divided by 3.0625 equals 22.9, while 154 pounds at 68.9 inches gives 703 times 154 divided by 4747 equals 22.9. Second pair at 85 kilograms and 180 centimeters yields 26.2 overweight, matching 187 pounds at 70.9 inches. Method table clarifies conversion | System | Inputs | Computation | Metric illustration | 70 kilograms, 175 centimeters | 70 divided by 3.06 equals 22.9 | Imperial illustration | 154 pounds, 68.9 inches | 703 times 154 divided by 4747 equals 22.9. Edge case of rounding height to whole centimeters shifts result by 0.3 points. Limitation assumes average frame, so broad shoulders inflate reading. For energy needs see /calorie-calculator.
Enter 70 kilograms and 175 centimeters to observe 22.9 normal with green indicator and formula breakdown and category explanation. Change weight to 90 kilograms while holding height constant to reveal 29.4 overweight amber flag, a 6.5-point jump from twenty kilograms difference. Test imperial equivalence with 154 pounds and 68.9 inches for matching 22.9, then 198 pounds at same height for 29.4 overweight. Edge case of athletes at 95 kilograms and 180 centimeters shows 29.3 overweight despite 12 percent fat, requiring waist review and strength context. Limitation excludes age-related sarcopenia, so older adults may appear normal while carrying excess fat centrally. This tool runs offline privately without uploads or accounts. This is general information only, not medical advice. See /terms and explore the Body Fat tab above for composition insight.