LBS to KG Converter

This converter takes a weight in pounds (the unit used on US scales, American fitness programmes and many older British records) and returns the equivalent in kilograms — the metric unit used by the NHS, European airlines and most of the world's gym equipment.

The formula in plain English: divide the number of pounds by 2.20462, or equivalently multiply by 0.45359237. One pound is defined as exactly 0.45359237 kg under the international yard-and-pound agreement of 1959, so there is no rounding error in the underlying factor — only in how many decimals you keep.

Worked example. A US training plan tells you to bench press 155 lb. Divide 155 ÷ 2.20462 = 70.3 kg. The nearest standard plate loading on a 20 kg Olympic bar is 25 kg per side (70 kg total), which gets you almost exactly there. A person weighing 200 lb is 200 ÷ 2.20462 ≈ 90.7 kg.

Why this matters. Loading the wrong weight on a bar isn't just embarrassing — it's how people get injured. If a programme calls for "60% of your 1RM" and your 1-rep max is recorded in pounds, you need a clean conversion to kg to set the plates correctly. The same applies to body-weight-dosed medications (especially paediatric prescriptions translated from US sources) and to translating older British weight records that mix stones and pounds into modern metric units.

When to use it. Translating US strength programmes to a UK gym, reading American nutrition labels, converting an old "stones and pounds" weight into kg for an NHS form, and pricing imports sold by the pound.

When not to rely on it. Prescription medication — always use the unit on the prescription. Precious metals, where "troy pounds" (12 troy ounces) differ from avoirdupois pounds and need a different conversion entirely.

Common mistakes. Treating 1 lb as 0.5 kg (it's 0.4536, so you over-state weight by 10%). Forgetting that 1 stone = 14 lb when converting British weights — "11 stone 4" is 158 lb (≈ 71.7 kg), not 11.4 lb. Confusing fluid ounces (volume) with ounces of weight when reading US recipes.