How to Convert Weight and Mass Units

Converting weight (or mass) units is a common necessity in daily life. Whether you are scaling ingredients for an international baking recipe, checking airline baggage limits, or tracking your fitness and weight loss progress, understanding how different mass scales translate is highly useful.

Metric Mass Units (SI)

The metric system is the universal scientific standard, using decimal steps based around the gram:

• Milligram (mg): 1 mg = 0.001 g
• Gram (g): 1 g = 0.001 kg
• Kilogram (kg): The standard base unit of mass.

Imperial Mass Units

Commonly used in the United States and UK retail contexts:

• Ounce (oz): 1 oz ≈ 28.35 g
• Pound (lb): 1 lb = 16 oz ≈ 453.59 g (or roughly 0.45 kg)

How to Convert Between Systems

Converting weight requires multiplying the source value by a standardized conversion factor.

• Pounds to Kilograms: Multiply the pound value by 0.45359237.
  • Example: A package weighing 15 lb converts to: 15 × 0.45359237 ≈ 6.80 kg
• Ounces to Grams: Multiply the ounce value by 28.349523125.
  • Example: A recipe call for 8 oz of flour translates to: 8 × 28.349523 ≈ 226.80 g

To run conversions quickly and avoid making mathematical mistakes in the kitchen or warehouse, use our interactive online Weight Converter.