Estimate lean body mass from weight and height with Boer and James formulas averaged — the number training actually moves. Track muscle, not just scale weight — free, local, informational only.
Compute body surface area with four formulas (Mosteller, Du Bois, Haycock, Gehan & George) for medication dosing and physiology. Get m² from height and weight — free, local, informational only.
Compute healthy weight range with Devine and Robinson formulas from height. See a 170 cm target band instantly — free, local, informational only.
Computes Body Mass Index from metric or imperial height and weight inputs, categorizing the result into underweight, normal, overweight, and obese, with a healthy weight range for your height. Health data never leaves your device — every calculation runs locally in your browser.
Compute net worth from total assets minus total liabilities. Track the number that actually matters yearly — free, local, no signup.
Scale one image to exact pixel dimensions — width/height fields prefill from the source — with optional aspect-ratio lock, PNG/JPEG/WebP output picker, and quality control for JPEG/WebP. Files over 50MB are rejected; resizing runs on plain canvas drawImage locally.
Scale weight mixes fat, muscle, water, and food; LBM isolates fat-free mass. The tool averages Boer and James estimates and derives a body-fat % from the gap: defaults (male, 80 kg, 180 cm) give Boer 61.4, James 62.7, average ≈62.1 kg with ~22% estimated fat.
DEXA gold standard; calipers and smart scales estimate within a few points. Consistent method matters more than absolute accuracy for trends.
1.6–2.2g per kg of lean mass for muscle goals — LBM-based targets beat bodyweight rules for lean and heavy alike.
No — math runs locally in your browser. Nothing leaves your device.
Body Fat Percentage Calculator
Calculate body fat percentage using the US Navy circumference method. Enter waist, neck, height, and hip measurements. Health data never leaves your device — every calculation runs locally in your browser.
Ideal Body Weight
Compute healthy weight range with Devine and Robinson formulas from height. See a 170 cm target band instantly — free, local, informational only.
Last updated October 2026