Ounces to Grams (oz to g)
One ounce is exactly 28.349523125 grams, defined as 1/16 of the international pound. To convert oz to g, multiply by that number: 4 oz is 113.4 g and 16 oz (one pound) is 453.6 g. The converter works both ways.
Convert oz to grams
Result
oz to grams
4 oz = 113.398 g
1 oz = 28.3495 g · 1 g = 0.035274 oz
Show the mathHow it was calculated
g = oz × 28.349523125
Uses exact legal definitions; results are rounded to 6 significant figures for display.
How to convert oz to grams
g = oz × 28.349523125
One ounce is exactly 28.349523125 grams, so multiply by 28.349523125.
Worked example: converting 4 oz:
- g = oz × 28.349523125
- 4 oz × 28.349523125 = 113.398 g
Oz to grams conversion table
Common values, each computed with the exact formula and rounded to 6 significant figures.
| Ounces (oz) | Grams (g) |
|---|---|
| 0.25 oz | 7.08738 g |
| 0.5 oz | 14.1748 g |
| 1 oz | 28.3495 g |
| 1.5 oz | 42.5243 g |
| 2 oz | 56.699 g |
| 2.5 oz | 70.8738 g |
| 3 oz | 85.0486 g |
| 3.5 oz | 99.2233 g |
| 4 oz | 113.398 g |
| 5 oz | 141.748 g |
| 6 oz | 170.097 g |
| 7 oz | 198.447 g |
| 8 oz | 226.796 g |
| 9 oz | 255.146 g |
| 10 oz | 283.495 g |
| 12 oz | 340.194 g |
| 14 oz | 396.893 g |
| 16 oz | 453.592 g |
| 18 oz | 510.291 g |
| 20 oz | 566.99 g |
| 24 oz | 680.389 g |
| 28 oz | 793.787 g |
| 32 oz | 907.185 g |
| 40 oz | 1,133.98 g |
| 48 oz | 1,360.78 g |
| 64 oz | 1,814.37 g |
Quick reference: everyday ounces in grams
One ounce
1 oz = 28.3495 g
A US stick of butter
4 oz = 113.398 g
A typical steak portion
8 oz = 226.796 g
A US bag of coffee
12 oz = 340.194 g
One pound
16 oz = 453.592 g
One troy ounce of gold (31.1 g), for comparison
1.09714 oz = 31.1035 g
Converting recipe ounces to grams
American recipes list solid ingredients in ounces by weight. A stick of butter is 4 oz (113.4 g), a box of pasta is often 16 oz (453.6 g), and a block of cream cheese is 8 oz (226.8 g). If you bake with a digital scale, grams give you finer steps than ounces. A scale reading in whole grams is about 28 times more precise than one reading in whole ounces.
Look out for liquid ingredients. When a recipe says '8 oz milk', it almost always means 8 fluid ounces (one cup) measured by volume, not 8 oz on a scale. For volume conversions use the fluid ounces to mL converter instead.
Postage, coffee bags and package weights
USPS prices First-Class letters by the ounce, up to a 3.5 oz maximum (99.2 g). International mail is often weighed in grams, so a card that weighs 1.2 oz on a US scale is 34 g on a European one. Package labels in the US show both units: a 12 oz bag of coffee is printed as 340 g.
Rounding goes both ways. If a European product says 250 g, the US label will usually show 8.8 oz, not 9. When you compare unit prices between countries, convert to the same unit first, then divide the price by it. The discount calculator and percentage calculator handle the comparison.
Frequently asked questions
Why do gold prices use a different ounce?
Precious metals are weighed in troy ounces, each exactly 31.1034768 g, about 10% heavier than the everyday avoirdupois ounce of 28.35 g. A gold price quoted 'per ounce' means per troy ounce. Converting a 1 oz coin's weight with the kitchen factor would understate it by almost 3 grams.
Can I use 30 grams per ounce?
For a quick estimate, yes: 30 g is 5.8% more than the true 28.35 g. For baking, where ratios matter, that error adds up. A 12 oz flour measurement would become 360 g instead of 340 g, an extra 20 g. Multiply by 28.35 instead, or use the table on this page.
How many grams are in a dry ounce?
A 'dry ounce' is simply the regular avoirdupois ounce of weight, 28.35 g. The word 'dry' is only there to distinguish it from the fluid ounce, which measures volume. A dry measuring cup tells you nothing about grams. To get a weight from a cup you need the ingredient's density, or better, a kitchen scale.