Weight Converter
Instantly convert between different units of weight and mass with our easy-to-use calculator. Perfect for cooking, fitness tracking, shipping calculations, and scientific applications.
Weight Converter
Common Weight Conversions
| From | To | Formula |
|---|---|---|
| Kilograms (kg) | Pounds (lb) | lb = kg × 2.2046226218 |
| Pounds (lb) | Kilograms (kg) | kg = lb × 0.45359237 |
| Grams (g) | Ounces (oz) | oz = g × 0.0352739619 |
| Ounces (oz) | Grams (g) | g = oz × 28.3495231 |
| Kilograms (kg) | Stone (st) | st = kg × 0.1574730444 |
| Pounds (lb) | Ounces (oz) | oz = lb × 16 |
About Weight Units and Measurement
Weight is a measure of the force of gravity acting on an object, while mass is a measure of the amount of matter in an object. In everyday usage, the terms are often used interchangeably, though they are distinct in scientific contexts. On Earth, an object's weight is proportional to its mass, which is why we commonly use weight units to describe how heavy something is.
Like length measurements, weight measurements primarily use two systems: the metric system (used by most countries worldwide) and the imperial/US customary system (used mainly in the United States and, to some extent, in the United Kingdom).
Common Weight Units
Metric System:
- Kilogram (kg): The base unit of mass in the metric system, defined by the Planck constant
- Gram (g): 1/1000 of a kilogram, used for smaller measurements
- Milligram (mg): 1/1000 of a gram, used for very small measurements like medication dosages
- Metric Ton (t): 1000 kilograms, used for very heavy objects
Imperial/US System:
- Pound (lb): The basic unit of weight in the imperial system, equal to 0.45359237 kilograms
- Ounce (oz): 1/16 of a pound, used for smaller measurements
- Stone (st): 14 pounds, commonly used in the UK for body weight
- Ton (US): 2000 pounds, used for very heavy objects
- Ton (UK): 2240 pounds, also called a "long ton"
Conversion Accuracy
Our weight converter uses the most precise conversion factors available to ensure accuracy:
- 1 kilogram = 2.2046226218 pounds (exact: 1 kg = 2.2046226218 lb)
- 1 pound = 0.45359237 kilograms (exact: 1 lb = 0.45359237 kg)
- 1 pound = 16 ounces (exact)
- 1 kilogram = 1000 grams (exact)
- 1 ounce = 28.3495231 grams (exact: 1 oz = 28.3495231 g)
These conversion factors are based on international standards and provide the most accurate weight conversions possible for all your measurement needs.