Everyone & professionals
Ideal Body Weight Calculator
Sex, Height
Ideal body weight by the Devine, Robinson, Miller and Hamwi equations.
Lean Body Weight Calculator
Estimated lean (fat-free) body weight by the Janmahasatian equation.
Your result will appear here
Enter your measurements, then press Calculate.
Methodology
Janmahasatian lean body weight (2005)
Men: 9270 × W / (6680 + 216 × BMI); Women: 9270 × W / (8780 + 244 × BMI)
A semi-mechanistic equation derived from DXA measurements that, unlike older equations, does not fall at very high body weights.
- Who it is for
- Adults aged 18 and over.
- Version
- 1.0.0
Worked example: how to calculate lean body weight
Inputs
- Sex
- Male
- Height
- 170 cm
- Weight
- 70 kg
Result
- Lean body weight
- 54.5 kg (≈ 120.2 lb)
- Estimated fat mass
- 15.5 kg (≈ 34.2 lb)
- BMI
- 24.2 kg/m²
Calculation:
BMI 24.22; 9270×70/(6680+216×24.22) = 54.48
An illustration with sample values, worked out with the same method the tool above uses.
Limitations
- An estimate; body composition scans measure it directly.
- Developed in adults; not for children.
References
- Janmahasatian S, Duffull SB, Ash S, Ward LC, Byrne NM, Green B. Quantification of lean bodyweight. Clin Pharmacokinet. 2005;44(10):1051–1065. doi:10.2165/00003088-200544100-00004
Continue with your measurements
Shared measurements carry over automatically, in this tab only.
For healthcare professionals
Adjusted Body Weight Calculator
Sex, Height, Weight
Adjusted body weight (IBW + 0.4 × excess weight) for dosing and nutrition calculations.
Body Fat Percentage Calculator
Sex, Height
Estimate body fat from tape measurements (US Navy method).