Convert Kilograms (kg) to Pounds (lb)
Category: Mass
1 kg = 2.204623 lb
High-precision rounding: 6 decimals
How to convert kilograms to pounds
We convert by pivoting through the SI base unit for Mass and applying exact factors where applicable.
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Quick conversion table
Handy values for Kilogram (kg) → Pound (lb). Click a value to open that exact result.
Conversion formula
Linear unit conversions use standardized factors; many are exact by definition (e.g., 1 in = 25.4 mm, 1 ft = 0.3048 m).
Common mistakes
- Confusing mass (lb) with force (lbf) in engineering contexts.
- Mixing metric tonnes (t) with short/long tons.
Unit facts
- Kilogram (kg): The kilogram is the SI base unit of mass; since 2019 defined by fixing Planck’s constant.
- Pound (lb): The (avoirdupois) pound is exactly 0.45359237 kg (1959). Still used for body weight and groceries in US/UK.
About Mass
Mass quantifies the amount of matter. The kilogram is defined by Planck’s constant, which anchors mass to fundamental physics. In practice, grams and pounds dominate everyday use—from recipes and parcels to body weight—while tonnes and long tons appear in logistics and industry.
About Kilogram (kg)
Kilogram (kg)
SI base unit of mass defined by fixing Planck’s constant h. The definition anchors mass to quantum physics rather than an artifact. Used universally from commerce to high-precision science.
History: In 2019 the kilogram was redefined via h and the second; before that it referenced the International Prototype of the Kilogram (IPK) stored near Paris.
About Pound (lb)
Pound (lb)
Imperial/US unit of mass; exactly 0.45359237 kg. Popular for body weight, groceries, and engineering specs in US industry.
History: Standardized in 1959; traces back to the Roman libra. Different historical pounds existed (avoirdupois, troy) before modern unification.