Weight & Mass Converter
Convert between different units of weight and mass. Choose your units below for an instant result.
Popular Weight & Mass Conversions
About Weight & Mass Conversions
Mass versus weight
Strictly speaking, mass is the amount of matter in an object (measured in kilograms), while weight is the force gravity exerts on that mass (measured in newtons). In everyday language, "weight" is used to mean mass, and converters like this one work with mass units. The distinction matters in physics but rarely in daily life.
Metric and imperial weight units
The metric system uses milligrams, grams, kilograms, and metric tonnes. Imperial units include ounces, pounds, and stones (used in the UK for body weight) and short tons (used in the US) or long tons (UK). 1 kilogram = 2.205 pounds; 1 stone = 14 pounds = 6.35 kg.
Weight in cooking and nutrition
Cooking recipes from different countries often use different weight systems. American recipes tend to use ounces and pounds; British and European recipes use grams and kilograms. A kitchen scale that switches between grams and ounces is invaluable for baking, where precise weights matter more than in general cooking.