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Body weight kg → lb

Convert body weight from kg to lb

Sources last checked: 2026-11-03

Body weight kg → lb

Convert body weight from kg to lb

Fill in every field to see the result.

Converts units only; reference ranges depend on the laboratory, the assay and the patient.

Source: NIST Special Publication 811 (2008), Guide for the Use of the International System of Units — Appendix B.8/B.9 conversion factors: 1 lb = 0.45359237 kg, 1 in = 2.54 cm, 1 mmHg = 133.322 Pa, t/°C = (t/°F − 32)/1.8.Open

What is the Body weight kg → lb?

This converter changes body weight from kilograms — the unit used in Europe, Turkey and dosing references — into pounds (lb), used in the USA. It divides by 0.45359237, the exact definition of the international pound in kilograms.

When to use it

  • Communicating with US colleagues or writing for a US audience
  • Checking a US protocol or label that states dosing per pound
  • Explaining a weight to someone used to pounds

When not to use it

  • Dosing calculations — keep weights in kg for dosing; convert only for communication
  • Stones (UK): divide the pound result by 14 if stones are needed

How it is calculated

lb = kg ÷ 0.45359237

Clinical pearls and limitations

  • Converts units only; reference ranges depend on the laboratory, the assay and the patient.
  • 1 kg ≈ 2.2046 lb.
  • Round to one decimal place; reporting more digits implies scale precision that does not exist.
  • When documenting, always write the unit next to the number — 'weight 70' is ambiguous in mixed-unit settings.

Frequently asked questions

How do I convert kilograms to pounds?

Divide by 0.45359237 (or multiply by about 2.2046). Example: 70 kg = 154.3 lb; 85 kg = 187.4 lb.

How many pounds is 1 kg?

About 2.2046 lb.

Why use the exact factor at all?

For everyday use the rounding hardly matters, but repeated back-and-forth conversions with rounded factors accumulate errors.

Evidence and guidelines

  1. Primary source: NIST Special Publication 811 (2008), Guide for the Use of the International System of Units — Appendix B.8/B.9 conversion factors: 1 lb = 0.45359237 kg, 1 in = 2.54 cm, 1 mmHg = 133.322 Pa, t/°C = (t/°F − 32)/1.8.

Have a follow-up question?

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For healthcare professionals and medical students. These tools support, and do not replace, clinical judgement. Always check results against the original source and your local protocols.