Weight Conversion - Convert Kilograms, Pounds, Ounces, and More
Weight Converter
Convert weight measurements between different units quickly and accurately
Convert Weight
Popular Weight Conversions
Quickly convert between the most commonly used weight units.
Understanding Weight Measurements
Weight and mass conversions are essential for various applications, from cooking and shipping to scientific research and everyday measurements. While mass measures the amount of matter in an object, weight refers to the gravitational force acting on that mass. In everyday usage, both terms are often used interchangeably. Understanding accurate weight conversions ensures consistency and precision across different measurement systems.
Common Weight Units
Metric Units
- Milligram (mg)
- Gram (g)
- Kilogram (kg)
- Metric Ton (mt)
Imperial/US Units
- Ounce (oz)
- Pound (lb)
- Stone (st)
- US Ton (t)
Common Applications
| Field | Measurement Types | Typical Uses |
|---|---|---|
| Cooking | Grams, Ounces | Recipe preparation, ingredient scaling |
| Shipping | Kilograms, Pounds | Package weight, shipping costs |
| Science | Milligrams, Grams | Precise measurements, laboratory work |
| Medicine | Milligrams, Grams | Drug dosages, medical measurements |
| Everyday Use | Kilograms, Pounds | Personal weight, groceries |
Conversion Tips
- Use a kitchen scale for precise weight measurements in cooking
- For shipping, always verify weight in both metric and imperial units
- In scientific contexts, use metric units for consistency
- Remember that 1 kilogram = 2.20462 pounds
- For small measurements, use milligrams or grams
Weight Conversions
| Conversion | Formula/Rule | Quick Answer |
|---|---|---|
| Kilograms to Pounds | 1 kg = 2.20462 lb | Multiply kg by 2.20462 |
| Pounds to Kilograms | 1 lb = 0.453592 kg | Multiply lb by 0.453592 |
| Grams to Ounces | 1 g = 0.035274 oz | Multiply g by 0.035274 |
| Ounces to Grams | 1 oz = 28.3495 g | Multiply oz by 28.3495 |
| Metric Ton to US Ton | 1 mt = 1.10231 t | Multiply mt by 1.10231 |
| US Ton to Metric Ton | 1 t = 0.907185 mt | Multiply t by 0.907185 |
| Stone to Pounds | 1 st = 14 lb | Multiply st by 14 |
| Pounds to Stone | 1 lb = 0.071429 st | Divide lb by 14 |
| Milligrams to Grams | 1 mg = 0.001 g | Divide mg by 1000 |
| Grams to Milligrams | 1 g = 1000 mg | Multiply g by 1000 |
Our weight conversion tool provides accurate conversions between all major weight units, making it easy to switch between metric and imperial systems. Whether you're cooking, shipping, conducting scientific research, or managing medical dosages, our converter ensures precise and reliable weight conversions for any application.
Weight Conversion Questions
Everything you need to know about weight measurements and conversions
What's the difference between mass and weight?
Mass is the amount of matter in an object, measured in kilograms in the metric system, and remains constant everywhere. Weight is the force of gravity acting on that mass, measured in newtons. In everyday usage, 'pounds' often refers to mass, though technically it's a unit of weight/force. Your mass stays the same on Earth and Moon, but your weight on the Moon would be about 1/6th of your Earth weight due to weaker gravity.
Why do pounds have two different meanings?
Pounds can refer to mass (pounds-mass, lbm) or force (pounds-force, lbf). In everyday use, 'pounds' typically means mass. On Earth's surface, 1 lbm experiences 1 lbf of gravitational force, so they're numerically equal but physically different concepts.
What is a stone and why is it used?
A stone equals 14 pounds and is commonly used in the UK and Ireland for measuring body weight. It originated from using actual stones as standard weights. For example, someone might weigh '10 stone 5 pounds' (145 pounds total) rather than just saying 145 pounds.
How do metric tons differ from US tons?
A metric ton (tonne) equals 1,000 kg or about 2,204.62 pounds. A US ton (short ton) equals 2,000 pounds or about 907.18 kg. There's also a UK ton (long ton) equal to 2,240 pounds. Always specify which ton when dealing with large weights.
How precise are kitchen scales and when does it matter?
Most kitchen scales are accurate to ±1-2 grams, which is sufficient for cooking. For baking, precision matters more—especially for items like flour, sugar, and leavening agents. Professional bakers often weigh ingredients rather than using volume measurements for consistency.
Why do gold and gems use different weight units?
Precious metals use troy ounces (31.1035 grams), which are heavier than regular ounces (28.3495 grams). Gems use carats (0.2 grams each). These specialized units evolved from historical trading practices and provide appropriate precision for valuable items.
How do I convert body weight between metric and imperial?
To convert kilograms to pounds, multiply by 2.20462. To convert pounds to kilograms, divide by 2.20462 (or multiply by 0.453592). For example: 70 kg = 154.3 lbs, and 150 lbs = 68.0 kg. For stones: divide pounds by 14.
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