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Bone Mass Estimate Calculator

Work out bone mass estimate instantly with clear inputs, formula shown and shareable results.

About Bone Mass Estimate Calculator

Bone mineral mass is roughly 4.3% of body weight in men and 3.8% in women, so a 75 kg man carries about 3.2 kg. The figure varies by 15% either way with frame size and mineral density, and it changes very slowly - which is why bioimpedance scales report bone mass that barely moves between weigh-ins.

Formulas

Bone mass estimate

bone = body weight x 0.043 (men) or 0.038 (women)

Typical variation

plus or minus about 15% with frame size and density

Worked example

With the default values below, Bone Mass Estimate Calculator returns Estimated Bone Mineral Mass of 3.23. Change any input above and every figure here is recalculated in your browser.

Inputs used

Body weightminimum 1 kg
75 kg
Heightminimum 100 cm
175 cm
Sexone of Male, Female
Male

Results

Estimated Bone Mineral Mass
3.23 kg
Bone As A Share Of Body Weight
4.3%
Typical Range For That Weight
2.74 to 3.71 kg
Bone Mass Index
1.053 kg/m2

Step by step

  1. 1Values used
  2. 2Bone mass estimate
  3. 3Typical variation
  4. 4Estimated Bone Mineral Mass= 3.23 kg
  5. 5Bone As A Share Of Body Weight= 4.3
  6. 6Typical Range For That Weight= 2.74 to 3.71 kg
  7. 7Bone Mass Index= 1.053 kg/m2

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • These figures are population-average estimates, not a medical assessment or diagnosis. Body composition equations carry errors of several percentage points, and healthy ranges vary with age, ethnicity, muscularity and medical history. Discuss weight or body composition goals with a qualified clinician or dietitian.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

These figures are population-average estimates, not a medical assessment or diagnosis. Body composition equations carry errors of several percentage points, and healthy ranges vary with age, ethnicity, muscularity and medical history. Discuss weight or body composition goals with a qualified clinician or dietitian.

Frequently Asked Questions

Why does my scale's bone reading never change?

Because bone mass genuinely changes over years, not weeks, and most scales derive it from a fixed fraction of your weight anyway.

How is bone density actually measured?

By DEXA scanning, which reports areal density in g/cm2 and a T-score against young adult norms. Mass alone does not diagnose osteoporosis.

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