FORMULA
How to convert
kg = lb × 0.45359237Example: 10 lb = 4.5359237 kg.
LB → KG
Pounds to Kilograms
Convert pounds to kilograms with an exact, deterministic calculation.
LIVE CONVERSIONDECIMAL ENGINE EXACT_
1 lb = 0.45359237 kg
MULTI-CONVERT
QUICK ANSWER
1 Pound
0.45359237 kg
REFERENCE TABLE
Pound to Kilogram
| pounds | kilograms |
|---|---|
| 1 lb | 0.45359237 kg |
| 5 lb | 2.26796185 kg |
| 10 lb | 4.5359237 kg |
| 25 lb | 11.33980925 kg |
| 50 lb | 22.6796185 kg |
| 100 lb | 45.359237 kg |
ABOUT THIS CONVERSION
Convert pounds to kilograms
The pound on this page is the international avoirdupois pound used for ordinary body, parcel, and product mass. It has the exact definition 0.45359237 kilogram, so laboratory and shipping calculations can retain more precision than typical display scales.
Real-world example
A 75 lb item is 34.01942775 kg. Airline baggage rules usually specify a rounded limit in both units, so follow the carrier’s stated limit rather than relying on a rounded conversion alone.
Rounding and precision
Match the result to the scale and quality of the measurement. A kitchen scale may justify whole grams, while freight may be rounded to kilograms. Keep guard digits for multi-step work and avoid presenting a converted value as more accurate than the source.
Regional context
This category uses the international avoirdupois pound and ounce. It does not represent troy ounces used for precious metals. A metric tonne is 1,000 kilograms and is not the same as a US short ton or Imperial long ton.
Common mistake
Pound-mass and pound-force describe different quantities. This page converts ordinary pounds of mass, not the pound-force used in engineering loads.
Editorial method
Definitions and sources are listed below. Calculations retain more precision than the default display and round only for presentation.
USEFUL ANSWERS
lb to kg FAQs
Is one pound exactly 0.45 kg?
No. That is a rough estimate; one international avoirdupois pound is exactly 0.45359237 kilogram.
Why can a baggage limit look inconsistent?
Carriers often publish separately rounded kilogram and pound limits rather than mathematically identical thresholds.
How do I convert pounds to kilograms?
Enter the lb value in the calculator. It applies the stored factor and offset definitions and returns the equivalent in kg; the formula and common-value table are shown on this page.
Is the lb to kg conversion exact?
Defined measurement relationships are calculated with decimal arithmetic from stored standards. The displayed answer may be rounded for readability. Currency results instead depend on the dated reference rate shown.
FROM UNIT
Pound
The international avoirdupois pound (lb) is exactly 0.45359237 kilograms. It is an avoirdupois or metric unit of mass, not a unit of force.
NIST Guide to the SI, SP 811 ↗Definition verified 14 August 2026TO UNIT
Kilogram
The kilogram (kg) is the SI base unit of mass and is defined through the fixed value of the Planck constant. It is an avoirdupois or metric unit of mass, not a unit of force.
NIST Guide to the SI, SP 811 ↗Definition verified 14 August 2026Content reviewed by Akhil Saroop · 16 August 2026 · Report an error on this page