Pounds to kg Converter

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Convert pounds to kilograms at the exact 1959 international factor 1 lb = 0.45359237 kg. A 200-lb athlete is 90.72 kg; a 50-lb suitcase fits the 22.7 kg airline check-in limit; a 1,500-lb pallet equals 680.39 kg. Common in shipping, fitness, medical dosing per body weight and any context where US/UK figures need to feed into a metric system. Browser-local.

Pound (lb)
Kilogram (kg)

Pound (lb) ā†’ Kilogram (kg)

Quick reference table

Pound (lb)Kilogram (kg)
1 lb0.4536 kg
2 lb0.9072 kg
5 lb2.268 kg
10 lb4.5359 kg
25 lb11.3398 kg
50 lb22.6796 kg
100 lb45.3592 kg

Glossary

Pound (lb)

A pound (avoirdupois) is exactly 0.45359237 kg by the international 1959 yard-and-pound agreement. It is the everyday US/UK unit for body weight, groceries, gym plates and shipping. Sixteen ounces make one pound; fourteen pounds make one stone (UK only). The symbol "lb" comes from Latin "libra".

Kilogram (kg)

The kilogram is the SI base unit of mass, redefined in 2019 in terms of the Planck constant (h = 6.62607015Ɨ10ā»Ā³ā“ JĀ·s). One kilogram equals 1000 g, 2.20462 lb or 0.157 stone. It anchors all other metric mass units and is the standard for body weight, groceries, freight and scientific work in nearly every country.

Metric system (SI)

The metric system is a decimal system of measurement built around the kilogram for mass, the meter for length and the second for time, with multiples and submultiples expressed as powers of ten (milligram, gram, tonne). Adopted in France in 1799 and codified internationally as the International System of Units (SI) in 1960, it is now the official system in nearly every country and the standard in science.

Imperial / US Customary system

The imperial system is the historical English system of weights and measures whose mass units are the ounce, pound, stone and ton (16 oz = 1 lb, 14 lb = 1 stone, 2,000 lb = 1 US short ton). Codified by the British Weights and Measures Act of 1824 and aligned with US Customary by the 1959 international yard-and-pound agreement (1 lb = 0.45359237 kg exactly), it is still used in the United States and the United Kingdom for everyday weights.

Related tools

Kilograms to Pounds
Convert kilograms to pounds ā€” 1 kg = 2.20462 lb (1 lb = 0.4536 kg)
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Pounds to Stones
Convert pounds to stones ā€” 14 lb = 1 stone
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