Weight

What is a Ounce? (oz)

Definition

An ounce (symbol: oz) is a unit of mass in the imperial and US customary systems. The avoirdupois ounce, used for most everyday purposes, equals 1/16 of a pound or approximately 28.35 grams. There is also a fluid ounce (fl oz) used to measure liquid volume, which is a different unit.

Common Uses

  • › Food packaging and nutrition labels
  • › Precious metals (troy ounce)
  • › Cooking and baking in the US
  • › Postal letter weights

Converters

Ounces to Grams → Ounces to Pounds →

Key Facts

  • Symbol
    oz
  • Category
    Weight
  • 1 oz = 28.3495 g
  • 1 oz = 0.0625 lb
  • 16 oz = 1 lb
  • 1 oz ≈ 0.0283 kg

Related Terms

About the Ounce

An ounce (symbol: oz) is a unit of mass in the imperial and US customary systems. The avoirdupois ounce, used for most everyday purposes, equals 1/16 of a pound or approximately 28.35 grams. There is also a fluid ounce (fl oz) used to measure liquid volume, which is a different unit.

Equivalents and conversions

  • 1 oz = 28.3495 g
  • 1 oz = 0.0625 lb
  • 16 oz = 1 lb
  • 1 oz ≈ 0.0283 kg

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