Advanced Weight Converter
Weight Comparison
Visual Representation
This bar represents the weight relative to 10kg/22lb:
Common Conversions
| Kilograms (kg) | Pounds (lb) | Stones (st) | Grams (g) | Ounces (oz) |
|---|---|---|---|---|
| 0.5 | 1.10 | 0.08 | 500 | 17.64 |
| 1 | 2.20 | 0.16 | 1000 | 35.27 |
| 2 | 4.41 | 0.31 | 2000 | 70.55 |
| 5 | 11.02 | 0.79 | 5000 | 176.37 |
| 10 | 22.05 | 1.57 | 10000 | 352.74 |
| 20 | 44.09 | 3.15 | 20000 | 705.48 |
| 50 | 110.23 | 7.87 | 50000 | 1763.70 |
| 100 | 220.46 | 15.75 | 100000 | 3527.40 |
Results will appear here after conversion.
BMI Categories
Body Mass Index (BMI) is a measure of body fat based on height and weight:
- Underweight: BMI less than 18.5
- Normal weight: BMI 18.5 to 24.9
- Overweight: BMI 25 to 29.9
- Obesity: BMI 30 or greater
Note: BMI is a screening tool but doesn't diagnose body fatness or health. Athletes may have a high BMI due to muscle mass. Consult a healthcare provider for a thorough health assessment.
Your conversion history will appear here.
About Weight Units
Weight is the measure of the gravitational force acting on an object. The SI unit of weight (mass) is the kilogram (kg).
Unit Conversion Formulas
| From | To | Formula |
|---|---|---|
| Kilograms (kg) | Pounds (lb) | lb = kg × 2.20462 |
| Pounds (lb) | Kilograms (kg) | kg = lb × 0.453592 |
| Kilograms (kg) | Grams (g) | g = kg × 1000 |
| Pounds (lb) | Ounces (oz) | oz = lb × 16 |
| Kilograms (kg) | Stones (st) | st = kg × 0.157473 |
| Pounds (lb) | Stones (st) | st = lb × 0.0714286 |
Historical Weight Units
Ancient Roman Units
1 Roman Pound (libra) = 328.9 grams
1 Uncia = 27.4 grams (1/12 of a libra)
The Roman pound is the origin of the "lb" abbreviation.
Traditional British Units
1 Stone = 14 pounds
1 Quarter = 2 stones = 28 pounds
1 Hundredweight = 8 stones = 112 pounds
1 Long Ton = 20 hundredweight = 2240 pounds
Troy Weight
Used for precious metals
1 Troy Ounce = 31.1 grams
1 Troy Pound = 12 troy ounces = 373.2 grams
Troy ounces are still used today for precious metals.
Apothecaries' Weight
Historically used for medicine
1 Grain = 64.8 milligrams
1 Scruple = 20 grains
1 Dram = 3 scruples
1 Ounce = 8 drams
1 Pound = 12 ounces (same as troy pound)
Interesting Facts
- The kilogram was originally defined as the mass of 1 liter of water at 4°C.
- Until 2019, the kilogram was defined by a physical platinum-iridium cylinder kept in France. It's now defined in terms of Planck's constant.
- Though pounds are commonly used in the US and UK, only three countries officially don't use the metric system: United States, Myanmar, and Liberia.
- The stone as a unit of weight is primarily used in the UK and Ireland.
- A metric ton (1000 kg) is slightly larger than an American ton (2000 lb or 907 kg) and slightly smaller than a British "long" ton (2240 lb or 1016 kg).
