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Sources and Accuracy
Weight and mass conversions use kilogram as the reference unit. Common factors include 1 pound = 0.45359237 kilogram and 1 ounce = 0.028349523125 kilogram.
Displayed results are rounded for readability. The calculator keeps enough precision for everyday use and switches to scientific notation for very large or very small values. Last reviewed: 2026-05-21.
About These Units
gram [g]
Definition
The gram is a metric mass unit equal to one thousandth of a kilogram.
History
Grams are part of the metric system and became common for small everyday weights.
Current use
Grams are used for food, nutrition, recipes, lab samples, postage, jewelry, and product labels.
pound [lb]
Definition
The pound is a US customary and imperial mass unit equal to exactly 0.45359237 kilograms.
History
The avoirdupois pound became the standard pound for general weight measurement in the modern yard-pound system.
Current use
Pounds are common for body weight, shipping, food labels, gym equipment, and consumer products in the United States.