Weight Converter
Convert between kilograms, pounds, ounces, stone, grams and other units of mass. One pound is exactly 0.45359237 kg.
Weight & Mass
To convert kilograms to pounds, multiply by 2.20462.
Weight Units, and How Weight Measurement Works
Weight is one of the most commonly used physical measurements in everyday life, science, trade, and health. It refers to how heavy an object is, and it is typically measured using units such as kilograms (kg), grams (g), pounds (lbs), and ounces (oz). Understanding weight and its measurement systems is essential for cooking, fitness, shipping, and global commerce.
What Is Weight?
Weight is the force exerted on an object due to gravity. In physics, it is closely related to mass, but they are not the same. Mass refers to the amount of matter in an object, while weight depends on gravity.
Formula
Weight = Mass × Gravity
An object's weight can change depending on the gravitational force of the planet or location.
Metric System: Kilograms, Grams, and Tonnes
The metric system is the most widely used system of measurement in the world.
Kilogram (kg)
The base unit of mass in the SI system. Used globally in science, trade, and everyday life. 1 kilogram = 1,000 grams.
Gram (g)
Used for smaller weights, such as food ingredients and small objects.
Tonne (t)
Used for heavy weights, such as vehicles, cargo, and industrial materials.
Imperial System: Pounds and Ounces
The imperial system is mainly used in the United States and partially in the United Kingdom.
Pound (lbs)
The most common unit of weight in the imperial system. 1 pound = 16 ounces. Used for body weight, groceries, and shipping.
Ounce (oz)
Used for smaller measurements, especially in cooking and food labeling.
Other Weight Units Around the World
- Stone (st) – Used in the UK for measuring body weight (1 stone = 14 pounds)
- Carat (ct) – Used for gemstones and jewelry
- Metric tonne – Used in shipping and global trade
How Weight Measurement Works Today
Modern weight measurement uses highly accurate tools and technology:
- Digital scales – Common in homes, kitchens, and industries
- Mechanical balances – Traditional tools used for precise measurements
- Industrial weighing systems – Used in logistics and shipping
- Medical scales – Used in healthcare to measure body weight
Weight vs Mass: Key Difference
- Mass is constant and measured in kilograms
- Weight changes depending on gravity
For example, a person would weigh less on the Moon than on Earth, even though their mass stays the same.
Why Weight Measurement Is Important
Health and Fitness
Tracking body weight and nutrition
Commerce and Trade
Buying and selling goods
Shipping and Logistics
Calculating transport costs
Science and Engineering
Conducting experiments and building systems
Convert body weight between kilograms, pounds, stone, and grams — for fitness, health tracking, and medical use.
Formula
1 kg = 2.205 lbs. 1 stone = 14 lbs = 6.35 kg. 1 lb = 453.59 g.
Reference Values
- •1 kg = 2.205 lbs
- •1 stone = 14 lbs (6.35 kg)
- •1 lb = 453.59 grams
FAQ
Common questions about Weight Converter
How we calculate this
We use the standard published formula for this calculation, and we show the working so you can check it.
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