Ounces to Grams Converter

They are different units that share a name. A weight ounce (the avoirdupois oz on a food label or postal scale) is a unit of mass: 1 oz = 28.349523125 g exactly. A fluid ounce (fl oz) is a unit of volume: 1 US fl oz = 29.5735295625 mL exactly. The two only coincide for water approximately. At the calculator's reference density, 1 US fl oz of water weighs about 29.5735 g, while 1 weight oz of water occupies about 28.41 mL. For oil, honey, or flour, the mismatch between weight and volume ounces can be much larger. Always check whether your recipe means ounces by weight or fluid ounces by volume.

Yes, within rounding. The avoirdupois ounce is defined by the 1959 International Yard and Pound Agreement as exactly 1/16 of an avoirdupois pound, and the pound is fixed at exactly 0.45359237 kg. Working that out gives 1 oz = 28.349523125 g exactly. This calculator rounds the working factor to 28.3495231 g, which matches the precision in the NIST handbook and is good to nine significant figures. The shortcut '1 oz is about 28.35 g' is correct to 5 parts per 100,000, which is well below the resolution of any kitchen or postal scale you will use it with.

Exactly 16 avoirdupois ounces make 1 avoirdupois pound, so 1 lb = 16 oz = 453.59237 g, 0.5 lb = 8 oz = 226.80 g (the canonical half-pound burger patty), 0.25 lb = 4 oz = 113.40 g (a quarter-pound patty), and 0.125 lb = 2 oz = 56.70 g. The 16-to-1 ratio is what makes 8 oz a half-pound and 4 oz a quarter-pound. Cooking and butchery in the US, UK, and Canada all default to this avoirdupois pound; food labels and postal scales never quietly switch to a different definition. The only related unit that breaks the 16-rule is the troy pound (12 troy oz), and that is exclusively used by jewelers and bullion refiners.

A troy ounce is a separate weight unit used worldwide for precious metals: gold, silver, platinum, and palladium. It is exactly 31.1034768 g, about 9.7 percent heavier than the avoirdupois ounce (28.3495 g). When the spot price of gold is quoted at $2,000 per oz, that means $2,000 per troy oz, not per the everyday food-label oz. Converting between the two matters in money terms: 1 kg of gold is 32.151 troy oz, not 35.274 avoirdupois oz, and at $2,000 per troy oz the gap is about $6,246. This calculator only handles avoirdupois ounces. For precious-metal work, use the dedicated grams-to-ounces converter, which surfaces both kinds of ounce side by side.

For most home baking and cooking, a digital kitchen scale with a 1 g resolution and a 5 kg (about 11 lb) capacity covers everything from a 2 g pinch of yeast to a 4 kg turkey. Look for a tare button (which zeroes the bowl weight so you can add ingredients in sequence) and grams plus ounces as switchable units. Pocket pastry scales with 0.1 g resolution are useful for sourdough hydration and espresso ratios but max out around 2 kg, so they cannot weigh a roast. Anything heavier than 5 kg (a Thanksgiving turkey, a bag of flour, a tray of bricks) moves to a postal or freight scale at 25 to 50 kg with 5 g resolution. King Arthur Baking and Serious Eats both recommend weighing flour rather than measuring by cup, because cup measurements of flour vary by about 15 percent depending on technique. Reading the scale once gives you the same grams every time.