The pound (avoirdupois) equals exactly 0.45359237 kilograms and 16 ounces.
Definition & Scientific Metrology
The pound is the principal unit of weight in the United States and is widely recognized in the United Kingdom, Canada, and aviation worldwide.
0.45359237 kgOrigins & Historical Evolution
The abbreviation "lb" comes from the ancient Roman libra. In 1959, the International Yard and Pound Agreement standardized 1 lb to 0.45359237 kg.
1 Pound in Other Mass Units
Direct standard conversion equivalents for 1 lb:
| Target Unit | Equivalent Value | Multiplier Equation |
|---|---|---|
| Kilograms (kg) | 0.454 | 1 lb × 0.45359237 |
| Grams (g) | 453.592 | 1 lb × 453.59237 |
| Ounces (oz) | 16 | 1 lb × 16 |
| Stones (st) | 0.071 | 1 lb × 0.07142857 |
| Metric Tons (t) | 0 | 1 lb × 0.000453592 |
Common Real-World Applications
- US body weight scales
- Supermarket produce and deli items in the US
- Gym weights, dumbbells, and barbell plates
- Aircraft payload and fuel capacity (lbs)
Interesting Metrology Facts
The # symbol on phone keypads is historically called the "pound sign" because of its use as an abbreviation for weight in the US.
One pound of butter occupies roughly 31 cubic inches.
Measurement Standards & Accuracy
Standard MultipliersFactors based on the 1959 International Yard and Pound Agreement and NIST SP 811.
- BIPM International Metrology Treaty
- NIST Guide for SI Units
- ISO 80000-4 Quantities and Units — Mass
Related Tools & Resources for Pound
Discover calculation widgets, unit comparisons, and printable lookup sheets for lb: