Pounds to Kilograms for Labels and Scales
Pounds to kilograms is a multiplication: multiply by 0.45359237. The tool uses the 1959 definition with no second rounding, so 100 lb shows exactly 45.359237 kg.
Recipes, labels and body weight
A US recipe calls for 1 lb of beef, which is 453.6 g, a bit over half a jin; 8 oz is 226.8 g, because one pound is 16 ounces. An imported cereal box marked 12.3 oz needs the same treatment before you can compare it with local pack sizes.
Body weight works the same way: a 150 lb target is 68.04 kg, and 200 lb is about 90.72 kg. In the other direction, 70 kg is 154.32 lb. Remembering 1 lb ≈ 0.45 kg is fine for a rough estimate, but multiply for anything precise.
- Convert pounds and ounces for a US recipe
- Read the net weight on an imported label
- Convert overseas body-weight and training figures
0.45359237 and ounces
One pound is exactly 0.45359237 kg under the 1959 international yard and pound agreement, the value used in trade and science. A pound is 16 ounces, so one ounce is 0.45359237 ÷ 16 = 0.028349523125 kg, about 28.35 g.
Below 1,000 the result keeps six decimals with trailing zeros removed; at 1,000 or more it keeps two. So 150 lb shows 68.038855 kg, 100 lb shows 45.359237 kg and 2,000 lb shows 907.18 kg. For baking, weigh in grams rather than estimating with 0.45.
- 1 lb = 16 oz, and 1 oz ≈ 28.35 g
- Weigh baking ingredients in grams
- Six decimals below 1,000, two above
Variants of the pound
The pound here is the international avoirdupois pound. The troy pound, used for precious metals, is about 373.24 g and is not the same. British body weight often uses stone, where 1 stone = 14 lb.
The tool converts mass only, not force, pressure or currency. When a forwarder charges by the pound, the billable weight is usually the greater of actual and volumetric weight. Use a kitchen scale for recipes and the carrier's chargeable weight for shipping.
- Troy pound ≈ 373.24 g, a different unit
- 1 stone = 14 lb
- Shipping uses actual or volumetric weight, whichever is greater
FAQ
What is the exact pound-to-kilogram factor?
One pound is exactly 0.45359237 kg under the 1959 international yard and pound agreement, the value used in trade and science. The tool multiplies by it directly, so no extra rounding creeps in.
What is 100 lb in kilograms?
100 × 0.45359237 = 45.359237 kg, and that is exactly what the page shows. The figure is exact, so it can go straight into a recipe sheet or a training log without further rounding.
How do I convert ounces in a recipe?
One pound is 16 ounces, so one ounce is 0.45359237 ÷ 16 ≈ 0.02835 kg, or about 28.35 g. Eight ounces is about 226.8 g and 12 ounces about 340.2 g; for small amounts of spice, use a gram scale.
Related tool：LBS to KG