Mass Conversion Formulas
Master mass and weight conversions with precise formulas for metric, imperial, and specialized measurement systems.
1Basic Mass Conversion Formula
Example: Convert 70 kg to pounds
Conversion factor: 1 kg = 2.20462 lbs
Example: Convert 5 pounds to kg
Conversion factor: 1 lb = 0.453592 kg
2Metric Mass Units
Base Unit: Kilogram (kg)
Metric Ton (tonne)
Quintal (q)
Hectogram (hg)
Smaller Units
Gram (g)
Centigram (cg)
Milligram (mg)
3Imperial Mass Units
Imperial System
Long Ton (UK)
Short Ton (US)
Hundredweight (cwt)
Common Units
Pound (lb)
Ounce (oz)
Stone (st)
4Quick Reference Conversion Table
| From | To | Multiply by | Example |
|---|---|---|---|
| Kilograms | Pounds | 2.20462 | 10 kg = 22.05 lbs |
| Pounds | Kilograms | 0.453592 | 150 lbs = 68.04 kg |
| Grams | Ounces | 0.035274 | 500 g = 17.64 oz |
| Ounces | Grams | 28.3495 | 8 oz = 226.8 g |
| Metric tons | Short tons | 1.10231 | 5 tonnes = 5.51 short tons |
| Stone | Kilograms | 6.35029 | 12 st = 76.2 kg |
5Precious Metals & Scientific Units
Troy System (Precious Metals)
Troy Pound
Troy Ounce
Pennyweight (dwt)
Scientific Units
Atomic Mass Unit (u)
Carat (ct)
Grain (gr)
6Mass vs Weight: Scientific Distinction
Mass
- Definition: Amount of matter in an object
- Units: kg, g, lb (commonly used)
- Constant: Same everywhere in universe
- Measured by: Balance scale
Weight
- Definition: Force exerted by gravity on mass
- Units: N (Newtons), lbf (pound-force)
- Variable: Changes with gravity
- Measured by: Spring scale
Practical Note
In everyday usage, "weight" and "mass" are used interchangeably. However, scientifically, a 70 kg person weighs 686 N on Earth but only 114 N on the Moon (same mass, different gravity).