Calcmedical

Ideal Body Weight (Devine)

General MedicineSurgery & TraumaCritical Care

Medical context

Calculate Devine ideal body weight, adjusted body weight, and estimated lean body weight.

Primary and hospital medicine teams use this for everyday internal medicine workflows.

This page explains the IBW formula, how to interpret the output, known limitations, and peer-reviewed references so you can verify results against primary sources and local protocols.

It is grouped under General Medicine because everyday internal medicine calculators.

How to use this calculator

  1. Enter the values requested by the IBW calculator using the units shown beside each field.
  2. Review the calculated result and read the interpretation section before acting on the output.
  3. Check limitations and references if the result will change management, dosing, or disposition.
  4. Use the related calculators section when you need supporting values (for example electrolytes, weight, or complementary risk scores).

Calculator

Result

70.5 kg

AdjBW 70.3 kg · 99% of IBW

Estimated LBW (Boer): 56.5 kg

Educational use only. Confirm results with clinical judgment, primary sources, and local protocols. Not a substitute for professional medical advice. Full disclaimer.

Formula

IBW men = 50 + 2.3×(in−60); women = 45.5 + 2.3×(in−60). AdjBW = IBW + 0.4×(ABW−IBW).

Interpretation

Used for tidal volume targets, some antimicrobial dosing, and nutrition estimates.

Limitations

Always follow drug-specific dosing references; IBW is an estimate.

Frequently asked questions

When use adjusted body weight?
Often for hydrophilic drugs in obesity when policy specifies AdjBW = IBW + 0.4×(ABW−IBW).
Is the IBW result enough to make a treatment decision?
No. Calculators support medical decision-making but do not replace examination, shared decision-making, institutional protocols, or consultant input when stakes are high.
Does Calcmedical store the values I type in?
Inputs are processed in your browser for this session. We do not ask for patient names or medical record numbers. See our privacy policy for hosting and analytics details.

References

  • Devine BJ. Ideal body weight
  • Boer P. Lean body mass estimation