Weight reference
Technical unit workspace
- Quantities
- Multi
- Systems
- SI / US
Common weight units:
- Kilogram (kg): SI base unit of mass
- Pound (lb): US customary & imperial
- Ounce (oz): 1/16 of a pound
- Gram (g): 1/1000 of a kilogram
- Stone (st): UK body weight unit
- Metric ton (t): 1000 kilograms
- Milligram (mg): 1/1000 of a gram
Key relationships:
- 1 kg = 2.205 lb = 35.274 oz
- 1 lb = 0.4536 kg = 16 oz
- 1 oz = 28.35 g
- 1 stone = 14 lb = 6.350 kg
The Kilogram:
Originally defined in 1795 as the mass of one liter of water at 4 degrees Celsius. In 1889, it was redefined by a physical platinum-iridium cylinder kept in Paris. Since 2019, it is defined by the Planck constant.
The Pound:
Derived from the Roman libra (hence the abbreviation "lb"). The modern avoirdupois pound was standardized in England and is defined as exactly 0.45359237 kilograms since 1959.
The Stone:
An ancient unit of weight used in trade, varying by commodity and region. Standardized at 14 pounds in England in 1835 and still commonly used for body weight in the UK and Ireland.
Metric units (kg, g, mg) are used for:
- Scientific and medical measurements
- International commerce and trade
- Food labeling (most countries)
- Industrial manufacturing
Imperial units (lb, oz, st) are used for:
- Body weight (US uses lb, UK uses stones)
- Cooking and recipes (US)
- Postal and shipping (US)
- Grocery and retail (US)
Specialized units:
- Metric tons: shipping and heavy industry
- Carats: gemstones and precious metals
- Troy ounces: precious metals trading
Weight Conversion Calculator
Quick answer
Formula: lb = kg x 2.20462
Converting Kilogram to Pound with 6-place display precision.
Measurement type
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Quick pairs
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Quantity
Weight
Input unit
Kilogram (kg)
Output unit
Pound (lb)
Popular weight pair converters
Published kilogram, pound, ounce, and gram pair pages.
What are Weight & Mass Measurements?
Weight and mass measurements quantify the amount of matter in an object. There are several systems for measuring weight, with kilograms, pounds, and grams being the most common units used worldwide.
The relationship between these units is precisely defined: 1 kg = 2.20462 lb = 35.274 oz = 1000 g. This relationship is fundamental in science, commerce, cooking, health, and many other fields.
Learn more from NIST or Bureau International des Poids et Mesures (BIPM).
Common Weight Conversions
| Weight | kg | lb | oz | g | st | t |
|---|---|---|---|---|---|---|
| 1 kg | 1 kg | 2.205 lb | 35.27 oz | 1000 g | 0.157 st | 0.001 t |
| 1 lb | 0.454 kg | 1 lb | 16 oz | 453.6 g | 0.071 st | 0.000454 t |
| 1 oz | 0.0283 kg | 0.0625 lb | 1 oz | 28.35 g | 0.00446 st | 0.0000283 t |
| 1 g | 0.001 kg | 0.0022 lb | 0.0353 oz | 1 g | 0.000157 st | 0.000001 t |
| 1 st | 6.350 kg | 14 lb | 224 oz | 6350 g | 1 st | 0.00635 t |
| 1 t | 1000 kg | 2205 lb | 35274 oz | 1000000 g | 157.5 st | 1 t |
Weight Conversion Applications
Health & Fitness
- Body weight tracking and BMI calculations
- Nutritional information and food portioning
- Medical dosage calculations based on body weight
Commerce & Trade
- International shipping weight calculations
- Import/export documentation and customs
- Product labeling and packaging requirements
Science & Engineering
- Chemical measurements and laboratory work
- Material science and structural engineering
- Pharmaceutical research and drug development
Cooking & Recipes
- Converting recipe measurements between systems
- Scaling ingredients for different serving sizes
- Professional bakery and restaurant operations
Educational Resource
This educational video explains how to convert between different weight and mass units using conversion factors, with clear examples including metric and imperial conversions.
Weight Conversion Resources
Get our comprehensive weight conversion chart showing kilograms, pounds, ounces, grams and other mass units for quick reference when you're working with weight measurements.
Weight Conversion FAQs
Find answers to common questions about weight measurements and conversions.
How do you convert between weight units?
To convert between weight units: 1) Kilograms to pounds: multiply by 2.20462, 2) Pounds to kilograms: multiply by 0.453592, 3) Ounces to grams: multiply by 28.3495, 4) Stones to kilograms: multiply by 6.35029. Our calculator handles these conversions automatically.
What are common weight units?
Common weight units include: 1) Kilogram (kg) - SI base unit, 2) Pound (lb) - US & UK, 3) Ounce (oz) - cooking & postal, 4) Gram (g) - small measurements, 5) Stone (st) - body weight in UK, 6) Metric ton (t) - heavy loads. Each unit is used in different contexts.
What is the difference between mass and weight?
Mass measures the amount of matter in an object and is constant everywhere (measured in kilograms). Weight is the force of gravity on an object and varies by location (measured in newtons). In everyday use, the terms are used interchangeably, and 'weight' units like pounds and kilograms actually measure mass.
What is the relationship between kilograms and pounds?
The relationship between kilograms and pounds is precisely defined: 1) 1 kilogram equals 2.20462 pounds, 2) 1 pound equals 0.453592 kilograms, 3) 1 pound contains 16 ounces, 4) 1 stone equals 14 pounds or 6.35029 kilograms. This relationship is essential for international commerce and travel.
Weight and mass conversion shortcuts
Move between kilogram, pound, ounce and gram converter pages.