Ounce

Ounce (oz)

The ounce is one of the oldest and most complex units in the imperial system, with multiple definitions depending on context (avoirdupois, troy, metric). The avoirdupois ounce (28.3495g) is standard for most commercial purposes.

Characteristics

• Imperial system unit
• 1 oz (avoirdupois) = 28.3495 grams
• 1 oz = 1/16 pound
• Common in: food labels, nutrition information (especially in the US), product weights
• Also used: troy ounce (31.1035 g) for precious metals, metric ounce variations

Conversions

• 1 oz = 28.3495 g
• 1 oz = 0.0283495 kg
• 1 oz = 0.0625 pounds
• 1 oz = 437.5 grains
• 16 oz = 1 pound
• 1 oz = 0.9115 troy ounces