quick homework checksshopping and product comparisonstravel planningprofessional estimatesDIY and household measurementsgeneral reference
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
stone [st]
Definition
The stone is an imperial mass unit equal to 14 pounds.
History
Stone weights were historically used for trade and became standardized in the imperial system.
Current use
Stones are mainly used for body weight in the United Kingdom and Ireland.
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.