Weight Calculator
Convert between common weight units like kilograms, pounds, ounces, grams, stones, and more. Simply enter your weight in one unit to see the conversion results in all other units.
Conversion Results
| Unit | Value |
|---|---|
| Enter a weight value to see conversions | |
About the Weight Calculator
This weight calculator helps you convert between common weight units like kilograms, pounds, ounces, grams, stones, and more. Simply enter your weight in one unit to see the conversion results in all other units.
Weight Conversion Basics
Weight is a measure of the force of gravity acting on an object. While mass remains constant regardless of location, weight can vary depending on the gravitational pull. On Earth, we often use mass and weight interchangeably.
Common Weight Units
Here are the most commonly used weight units and their relationships:
| Unit | Equivalent To | Common Uses |
|---|---|---|
| Kilogram (kg) | 1000 grams | International standard, science, most countries |
| Gram (g) | 0.001 kg | Small measurements, cooking |
| Milligram (mg) | 0.001 g | Medicine, chemistry |
| Pound (lb) | 16 ounces, 0.453592 kg | United States, UK (informal) |
| Ounce (oz) | 1/16 lb, 28.3495 g | Small measurements in US/UK |
| Stone (st) | 14 lb, 6.35029 kg | UK body weight |
| Metric Ton (t) | 1000 kg | Large quantities, shipping |
| US Ton (short ton) | 2000 lb | United States |
| UK Ton (long ton) | 2240 lb | United Kingdom |
Conversion Formulas
The calculator uses these exact conversion factors:
- 1 kilogram (kg) = 1000 grams (g)
- 1 gram (g) = 1000 milligrams (mg)
- 1 pound (lb) = 16 ounces (oz)
- 1 pound (lb) = 0.45359237 kilograms (kg)
- 1 stone (st) = 14 pounds (lb)
- 1 metric ton (t) = 1000 kilograms (kg)
- 1 US ton (short ton) = 2000 pounds (lb)
- 1 UK ton (long ton) = 2240 pounds (lb)
Weight vs. Mass
While often used interchangeably in everyday language, weight and mass are different concepts:
- Mass is a measure of the amount of matter in an object (constant everywhere)
- Weight is the force exerted on that mass by gravity (varies by location)
- On Earth's surface, weight = mass × gravitational acceleration (9.81 m/s²)
- On the Moon, your mass would be the same but your weight would be about 1/6 of Earth weight
Practical Applications
Weight conversions are essential for:
- Cooking and baking with recipes from different countries
- Understanding nutrition labels with different measurement systems
- International trade and shipping calculations
- Science experiments requiring precise measurements
- Traveling between countries using different measurement systems
- Fitness tracking and body weight monitoring
Historical Context
The current system of weights has evolved over centuries:
- The metric system was developed during the French Revolution (1790s)
- The kilogram was originally defined as the mass of 1 liter of water
- The pound has roots in Roman measurements (libra)
- The stone was used historically in many European countries for trade
- The US customary system is derived from British Imperial units