Ounces to grams
g = oz × 28.349523125
Exact factor, from 1 oz = 1/16 lb and 1 lb = 453.59237 g.
Convert ounces to grams (and grams to ounces)
Two-way ounces ↔ grams converter: exact factor (1 oz = 28.349523125 g), formula, the difference between avoirdupois, troy and fluid ounces, a mental-math shortcut and real examples (recipes, coffee, parcels).
Conversion table
| oz | g |
|---|---|
| 0.5 oz | 14.1748 g |
| 1 oz | 28.3495 g |
| 2 oz | 56.699 g |
| 3 oz | 85.0486 g |
| 4 oz | 113.398 g |
| 6 oz | 170.097 g |
| 8 oz | 226.796 g |
| 12 oz | 340.194 g |
| 16 oz | 453.592 g |
| g | oz |
|---|---|
| 10 g | 0.3527 oz |
| 25 g | 0.8818 oz |
| 50 g | 1.7637 oz |
| 100 g | 3.5274 oz |
| 125 g | 4.40925 oz |
| 200 g | 7.05479 oz |
| 250 g | 8.81849 oz |
| 500 g | 17.637 oz |
| 1,000 g | 35.274 oz |
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How does this tool work?
This converter turns ounces (oz) into grams and grams into ounces: type a value in either field and the other updates instantly. It is mostly used to follow a US or UK recipe with a scale set to grams, to read the weight of an imported product (coffee, spices, cosmetics), to work out a parcel weight or to compare offers priced in the other unit.
The ounce used here is the avoirdupois ounce (symbol oz), one sixteenth of the international pound. Since the 1959 international yard and pound agreement, 1 lb = 0.45359237 kg, so 1 oz = 453.59237 ÷ 16 = 28.349523125 g exactly. It follows that 1 g ≈ 0.035274 oz.
To convert ounces to grams, multiply by 28.349523125; to convert grams to ounces, divide by 28.349523125 (or multiply by 0.035274). For a weight given in pounds and ounces such as "1 lb 4 oz", convert to ounces first (1 × 16 + 4 = 20 oz), then to grams: 20 × 28.3495 ≈ 567 g.
In your head, count 28 g per ounce and add 1%: 8 oz → 224 + 2 = 226 g (exact value 226.80). The other way, divide grams by 28 and take off 1%: 250 g → 8.93 − 0.09 ≈ 8.84 oz (exact value 8.82). For small amounts of spice or yeast, rounding to 30 g per ounce is acceptable.
Do not mix up three different "ounces". The avoirdupois ounce weighs 28.3495 g; the troy ounce, used only for precious metals (gold, silver, platinum), weighs 31.1034768 g, about 9.7% more; the fluid ounce (fl oz) is a unit of volume, 29.5735 mL in the US and 28.4131 mL in the UK, and cannot be turned into grams without knowing the liquid's density.
How to use this tool
Enter a weight
Use the Ounces or the Grams field; decimals work, for example 3.5 oz. For pounds and ounces, convert the whole amount to ounces first.
Read the exact result
The other field updates as you type using the exact factor; round to the nearest gram for a recipe, to a tenth for postage or precise weighing.
Check the table
The table under the converter lists common values (1, 2, 5, 10, 20, 50, 100 and 1,000) in both directions, handy to keep next to the scale.
Ounce ↔ gram conversion formulas
The avoirdupois ounce derives from the international pound, itself defined from the kilogram.
Grams to ounces
oz = g ÷ 28.349523125 ≈ g × 0.035274
The 0.035274 factor is rounded to the millionth.
Pounds and ounces to grams
g = (lb × 16 + oz) × 28.349523125
For a weight written in pounds and ounces, such as 1 lb 4 oz.
- oz
- mass in avoirdupois ounces (1 oz = 1/16 lb)
- lb
- mass in international pounds (1 lb = 453.59237 g)
- g
- mass in grams
Example: 4 oz = 4 × 28.349523125 = 113.398 g; and 1 lb 4 oz = 20 oz = 567.0 g.
Use cases
Cooking and baking
Adapt an American or British recipe written in ounces to a kitchen scale in grams, or the reverse.
Imported products
Read the net weight of coffee, tea, spices or cosmetics sold in ounces and compare their price per kilo.
Shipping and parcels
Convert a parcel weight to match carrier rate bands, which in the US are priced in ounces and pounds.
Jewelry and precious metals
Tell the avoirdupois ounce from the troy ounce when a listing quotes a weight of gold or silver.
Examples
One ounce in grams
1 × 28.349523125 ≈ 28.35 g, the value to remember for every conversion.
Input
1 ozResult
28.35 gA US stick of butter
4 × 28.349523125 = 113.398 g; a US stick weighs 4 oz, which is half a cup.
Input
4 ozResult
113.40 gA 12 oz pack of pasta
12 × 28.349523125 = 340.194 g, a little over 340 g.
Input
12 ozResult
340.19 gFlour weighed in grams
250 ÷ 28.349523125 ≈ 8.818 oz, a little under 9 oz.
Input
250 gResult
8.82 ozA one troy ounce gold bar
The troy ounce is exactly 31.1034768 g versus 28.35 g for the ordinary ounce: mixing them up skews the weight by 9.7%.
Input
1 troy ozResult
31.10 gTips and best practices
- Quick reference: 1 oz ≈ 28.35 g, 4 oz ≈ 113 g, 8 oz ≈ 227 g and 16 oz = 1 lb ≈ 454 g.
- A recipe in cups or fl oz describes a volume: to get grams you need the ingredient's density (a cup of flour does not weigh a cup of sugar).
- For gold, silver or platinum, use the troy ounce (31.1035 g), not the ordinary ounce.
- For weights given in pounds, a dedicated pounds ↔ grams converter exists as well.
- Weigh in grams whenever you can: a scale is more consistent than measuring cups.
Sources and references
Frequently asked questions
How many grams are in an ounce?
One avoirdupois ounce is exactly 28.349523125 g, about 28.35 g. It is defined as one sixteenth of the international pound (453.59237 g).
How do I convert ounces to grams?
Multiply the ounces by 28.349523125. For example, 6 oz is about 170.10 g and 10 oz about 283.50 g.
How do I convert grams to ounces?
Divide the grams by 28.349523125, or multiply by 0.035274. For example, 100 g is about 3.53 oz and 500 g about 17.64 oz.
What is the difference between an ounce and a troy ounce?
The troy ounce (31.1034768 g) is used only for gold, silver and platinum; it is 9.7% heavier than the avoirdupois ounce (28.3495 g) used for food and mail.
Does a fluid ounce weigh one ounce?
No: the fluid ounce is a unit of volume (29.5735 mL in the US, 28.4131 mL in the UK). Only water comes close: 1 US fl oz of water weighs about 29.57 g, or 1.04 oz.
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