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What is a healthy Lean Body Mass?
A healthy LBM for men is above 75% and for women it is above 68%.

Which formula should I use?
The Boer formula is the most commonly used, but for completeness other formulas are included.

Lean Body Mass Formulas for Adults:
Boer Formula:
For men:           LBM = 0.407W + 0.267H - 19.2
For women:      LBM = 0.252W + 0.473H - 48.3

James Formula:
For men:           LBM = 1.1W - 128${\left(\frac{\mathrm{W}}{\mathrm{H}}\right)}^2$
For women:      LBM = 1.07W - 148${\left(\frac{\mathrm{W}}{\mathrm{H}}\right)}^2$

Hume Formula:
For men:           LBM = 0.32810W + 0.33929H - 29.5336
For women:      LBM = 0.29569W + 0.41813H - 43.2933

where:
W is body weight in kg
H is body height in cm

Lean Body Mass Formula for Children:
Peters Formula:
ECV = 0.0215 × W^0.6469 × H^0.7236
LBM = 3.8 × ECV

Source:

1. Boer P. "Estimated lean body mass as an index for normalization of body fluid volumes in man." Am J Physiol 1984; 247: F632-5
2. James, W. "Research on obesity: a report of the DHSS/MRC group" HM Stationery Office 1976
3. Hume, R "Prediction of lean body mass from height and weight.". J Clin Pathol. 1966 Jul; 19(4):389-91.
4. A. M. Peters, H. L. R. Snelling, D. M. Glass, N. J. Bird "Estimation of lean body mass in children". British Journal of Anaesthesia1 06(5): 719-23 (2011).