Grams to Ounces conversion

Grams to ounces

Grams are the metric unit for anything small enough to hold in your hand — food portions, letters, jewellery, coffee beans. Ounces are their counterpart in the United States and, informally, in the United Kingdom. Because one avoirdupois ounce is 28.3495 grams, converting the other way means dividing: grams ÷ 28.3495 = ounces.

Quick mental math

Dividing by 28.35 is awkward without a calculator, so two shortcuts help. First, 100 g is about 3.5 oz, so 200 g ≈ 7 oz, 300 g ≈ 10.5 oz and so on. Second, 30 g is roughly 1 oz (slightly more), which is close enough for portion sizes.

Reference table

• 10 g = 0.35 oz
• 25 g = 0.88 oz
• 50 g = 1.76 oz
• 100 g = 3.53 oz
• 250 g = 8.82 oz
• 500 g = 17.64 oz (about 1.1 lb)
• 1000 g = 35.27 oz (2.2 lb)

Where it matters

Cooking. Following a European recipe with an American scale, or reading a nutrition label that lists grams when your diet plan counts ounces. Coffee and tea. Brewing guides quote doses in grams; bags are often sold in 12 oz or 16 oz sizes. Post. A 20 g letter is 0.7 oz, comfortably inside the one-ounce first-class limit.

Weight versus volume

This conversion is for mass. If your recipe says "8 fl oz" of milk, that is a volume — use the milliliters to fluid ounces converter instead. The two ounces happen to coincide for water (one fluid ounce of water weighs about one ounce), which is where the confusion comes from, but for oil, honey or flour the numbers diverge quickly.

Precious metals

Bullion is priced per troy ounce (31.1035 g), not per avoirdupois ounce. 100 g of gold is 3.215 troy ounces, not 3.53.

Worked examples

A 200 g block of butter. 200 ÷ 28.35 = 7.05 oz — just under the American two-stick pack (8 oz).

A 340 g jar of jam. 340 ÷ 28.35 = 12 oz, the standard US jar size; the metric label is simply the conversion.

A 30 g portion of cheese. 30 ÷ 28.35 = 1.06 oz — about one ounce, the usual nutrition-label serving.

Frequently asked questions

How many ounces are in 100 grams? 3.53 oz. Ten grams is 0.35 oz, and 500 g is 17.6 oz.

How do I convert grams to pounds and ounces? Divide by 453.6 for pounds, then multiply the remainder by 16 for ounces: 1 000 g = 2 lb 3.3 oz.

Is 250 g half a pound? Close but not quite: half a pound is 227 g, so 250 g is 8.8 oz, about 10 % more.

Related conversions

For whole kilograms, kilograms to pounds (× 2.2046) is quicker. Gold and silver use the troy ounce of 31.1 g — divide by 31.1035 instead of 28.35.

Good to know

Gram-to-ounce conversions are all over the coffee world. Brewing guides give a dose of 18 g for a double espresso, 0.63 oz; a pour-over uses 15 g (0.53 oz) per 250 ml of water. Coffee bags are sold in 250 g (8.8 oz) in Europe and 12 oz (340 g) in the US, so an American bag holds about 36 % more. Tea is similar: 2 g per cup, 0.07 oz, and a 100 g tin is 3.5 oz. For yeast, the metric 7 g sachet is a quarter ounce, exactly the American "¼ oz packet" — one of the few cases where the two systems line up neatly.