Type a value in any box to instantly convert between units.
Whether you are measuring ingredients for baking, checking your luggage weight before a flight, or tracking your fitness goals, dealing with metric and imperial units can be confusing. Our Free Weight Converter does the heavy lifting for you.
Unlike most online calculators that require you to select "From" and "To" from a dropdown menu, our tool is fully synchronized. Just type a number into any unit box, and all other equivalent weights will update in real-time.
In everyday conversation, people use "weight" and "mass" interchangeably. However, in physics, they are different. Mass (measured in kilograms or grams) is the amount of matter in an object and never changes. Weight (measured in Newtons or pounds-force) is the force exerted by gravity on that mass. For example, your mass is the same on the Moon as on Earth, but your weight would be much less on the Moon due to lower gravity!
There are exactly 16 ounces (oz) in 1 pound (lb). When calculating shipping weights or cooking measurements in the imperial system, this is the most common conversion you will need to make.
The "stone" (st) is an imperial unit of mass still commonly used in the United Kingdom and Ireland to measure human body weight. 1 stone is equal to exactly 14 pounds (or roughly 6.35 kilograms).