Ounces to Grams Converter (oz to g)
Type ounces or grams and see the other straight away. Handles pounds and ounces, troy ounces for gold, and fractions like 1/2 oz.
Type in either box. Fractions and commas are fine: 1 1/2, ½ or 1,250.
Fractions apply to pounds, ounces and stone.
Very big or tiny numbers switch to it on their own.
Fluid ounces are different. A fluid ounce (fl oz) measures volume, not weight: a US fl oz is 29.57 ml and a UK fl oz is 28.41 ml. Water weighs about 1 g per ml, but flour, sugar and oil don't, so use the cups to grams converter for ingredients by volume.
Also see: pounds to kg, miles to km, volume converter, °C to °F and the all-in-one unit converter.
Ounces to grams and grams to ounces tables
| Ounces | Grams |
|---|---|
| 1/8 oz | 3.54 g |
| 1/4 oz | 7.09 g |
| 1/2 oz | 14.17 g |
| 3/4 oz | 21.26 g |
| 1 oz | 28.35 g |
| 2 oz | 56.70 g |
| 3 oz | 85.05 g |
| 4 oz | 113.40 g |
| 5 oz | 141.75 g |
| 6 oz | 170.10 g |
| 7 oz | 198.45 g |
| 8 oz | 226.80 g |
| 9 oz | 255.15 g |
| 10 oz | 283.50 g |
| 11 oz | 311.84 g |
| 12 oz | 340.19 g |
| 13 oz | 368.54 g |
| 14 oz | 396.89 g |
| 15 oz | 425.24 g |
| 16 oz | 453.59 g |
| 20 oz | 566.99 g |
| 24 oz | 680.39 g |
| 32 oz | 907.18 g |
| 48 oz | 1,360.78 g |
| 64 oz | 1,814.37 g |
| Grams | Ounces |
|---|---|
| 1 g | 0.04 oz |
| 5 g | 0.18 oz |
| 10 g | 0.35 oz |
| 15 g | 0.53 oz |
| 20 g | 0.71 oz |
| 25 g | 0.88 oz |
| 28 g | 0.99 oz |
| 30 g | 1.06 oz |
| 50 g | 1.76 oz |
| 75 g | 2.65 oz |
| 100 g | 3.53 oz |
| 125 g | 4.41 oz |
| 150 g | 5.29 oz |
| 200 g | 7.05 oz |
| 250 g | 8.82 oz |
| 300 g | 10.58 oz |
| 400 g | 14.11 oz |
| 454 g | 16.01 oz |
| 500 g | 17.64 oz |
| 750 g | 26.46 oz |
| 1,000 g | 35.27 oz |
Common examples
Cooking
- 4 oz = 113.4 g
- 8 oz = 226.8 g
- 16 oz = 453.6 g
- 6 oz = 170.1 g
- 100 g = 3.53 oz
- 250 g = 8.82 oz
- 500 g = 1 lb 1.64 oz
Letters and parcels
- 1 oz = 28.35 g
- 3.5 oz = 99.22 g
- 13 oz = 368.54 g
- 20 g = 0.71 oz
- 100 g = 3.53 oz
- 2,000 g = 4 lb 6.55 oz
Gold and silver (troy ounces)
- 1 oz t = 31.1035 g
- 0.1 oz t = 3.11 g
- 0.25 oz t = 7.78 g
- 1 oz t = 1.0971 oz
- 1 kg = 32.15 oz t
- 100 g = 3.22 oz t
How your conversion is worked out
One exact number links ounces and grams: 1 oz = 28.349523125 g.
- 1
The factor
1 oz =28.349523125 gexact
- 2
Multiply
8 × 28.349523125= 226.7962 g
- 3
Round it
226.7962 g≈ 226.8 g
- 4
Check it back
226.8 ÷ 28.349523125≈ 8 oz
Read more: the formula, a worked example, tables, troy ounces and fluid ounces
The formula
grams = ounces × 28.349523125
ounces = grams ÷ 28.349523125 (about × 0.035274)
grams = troy ounces × 31.1034768
1 pound = 16 ounces = 453.59237 g
Worked example
Convert 8 oz to grams: 8 × 28.349523125 = 226.796185, which rounds to 226.8 g. To check it, go back: 226.796185 ÷ 28.349523125 = 8 oz.
The other way, 250 g to ounces: 250 ÷ 28.349523125 = 8.82 oz. For gold, 1 troy ounce is 31.1034768 g, so a 100 g bar is 100 ÷ 31.1034768 = 3.22 troy ounces.
Troy ounces to grams
| Troy ounces | Grams | Everyday ounces |
|---|---|---|
| 0.1 oz t | 3.11 g | 0.110 oz |
| 0.25 oz t | 7.78 g | 0.274 oz |
| 0.5 oz t | 15.55 g | 0.549 oz |
| 1 oz t | 31.10 g | 1.097 oz |
| 2 oz t | 62.21 g | 2.194 oz |
| 5 oz t | 155.52 g | 5.486 oz |
| 10 oz t | 311.03 g | 10.971 oz |
| 50 oz t | 1,555.17 g | 54.857 oz |
| 100 oz t | 3,110.35 g | 109.714 oz |
Three kinds of ounce
- Ounce (oz): the everyday weight, 1/16 of a pound, exactly 28.349523125 g. Used for food, post and body weight.
- Troy ounce (oz t): exactly 31.1034768 g, used for gold, silver and other precious metals. There are 12 troy ounces in a troy pound.
- Fluid ounce (fl oz): a volume, not a weight. US 29.5735 ml, UK 28.4131 ml. How much it weighs depends on what's in it.
Why the number is exact
Since the 1959 international agreement, a pound is exactly 0.45359237 kg. An ounce is a sixteenth of that, so 453.59237 g ÷ 16 = 28.349523125 g, exactly. The troy ounce is defined as 480 grains of 64.79891 mg each, which is 31.1034768 g.
Other small weights
1 carat (gemstones) = 0.2 g. 1 grain = 64.79891 mg, used for bullets, arrows and some medicines. 1 g = 1,000 mg. All of these are in Advanced.
Common questions
How many grams are in an ounce?
One ounce is exactly 28.349523125 grams, which most people round to 28.35 g (or 28 g for a rough guess). So 8 oz is 8 × 28.3495 = 226.8 g, and 16 oz, one pound, is 453.59 g. This is the everyday (avoirdupois) ounce used for food, post and body weight.
How do I convert grams to ounces?
Divide the grams by 28.3495, or multiply by 0.035274, which is the same thing. So 100 g ÷ 28.3495 = 3.53 oz and 250 g is 8.82 oz. A quick way in your head: 30 g is about 1 oz, so divide by 30 and add a little.
What is a troy ounce?
A troy ounce is the unit used for gold, silver, platinum and other precious metals. It is exactly 31.1034768 g, about 9.7% heavier than an ordinary ounce (28.35 g). A 1 kg gold bar is 32.15 troy ounces. Choose oz t in Advanced to convert troy ounces.
Is a fluid ounce the same as an ounce?
No. An ounce is a weight; a fluid ounce is a volume. A US fluid ounce is 29.57 ml and a UK fluid ounce is 28.41 ml. Water weighs about 1 g per ml, so a US fluid ounce of water is roughly 29.6 g, but a fluid ounce of flour or honey weighs quite different amounts.
How many ounces are in a pound?
There are 16 ounces in a pound, so 1 lb = 16 oz = 453.59237 g. To turn ounces into pounds and ounces, divide by 16: 40 oz is 2 lb 8 oz. Choose lb + oz in Advanced to type or see pounds and ounces together.
How many grams is 4 oz?
4 oz is 113.4 g (4 × 28.349523125 = 113.398 g). That is a quarter of a pound, the size of one US stick of butter. Half a pound, 8 oz, is 226.8 g, and 12 oz is 340.2 g.
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