Grams vs Ounces for Baking: Conversion, Precision & When to Use Each

Grams and ounces are both units of mass: they measure how much an ingredient weighs, not how much space it takes up. They simply come from different systems, grams from the metric system and ounces from US customary (avoirdupois) weight, and the two convert with one fixed number: 1 oz = 28.3495 g. That factor never changes with the ingredient, which makes this a much simpler conversion than grams to cups. It is also a completely different comparison from ounces vs fluid ounces, which is weight vs volume, not two units of the same thing.

This article covers the exact factor, how to convert in both directions with the arithmetic shown, common baking amounts in both units, and why grams are the more practical choice once you are weighing at kitchen scale.

Grams and Ounces Are Both Weight Units

A gram (g) is the base small unit of mass in the metric system. An ounce (oz) is a customary unit of mass, 1/16 of a pound, still standard on US butter wrappers, yeast packets, and some older cookbooks. Both describe the same physical property: how heavy something is on a scale.

That puts this comparison in a different category from most of the conversions on this site. Converting grams to cups means going from weight to volume, and it needs a separate density value for every ingredient, because a cup of flour and a cup of honey take up the same space but weigh very differently. Converting grams to ounces never involves volume or density at all. It is one weight unit to another, and the same multiplier applies no matter what is on the scale.

The Exact Conversion Factor: 1 Ounce = 28.3495 Grams

The avoirdupois pound was fixed at exactly 0.45359237 kilograms by the international yard and pound agreement of 1959, an agreement signed by the United States, the United Kingdom, Canada, Australia, New Zealand, and South Africa and maintained today in NIST’s published tables of unit conversions. An ounce is 1/16 of that pound:

0.45359237 kg ÷ 16 = 0.028349523125 kg = 28.349523125 g

This site rounds that to four decimal places for its converter and charts: G_PER_OZ = 28.3495. The two formulas you need are:

ounces = grams ÷ 28.3495

grams = ounces × 28.3495

Both directions use the same constant. There is no version of this factor for flour and a different one for sugar. That single fact is the main thing that separates a grams-ounces conversion from a grams-cups conversion, and it is worth holding onto before the worked examples below.

Converting Grams to Ounces

To go from grams to ounces, divide by 28.3495. Four examples, from a single gram up to half a kilogram:

1 g of salt. 1 ÷ 28.3495 = 0.0353 oz. A single gram is such a small fraction of an ounce that an ounce-only scale display would round it to zero; this is the clearest case for why fine amounts are easier to work with in grams.

7 g of active dry yeast. 7 ÷ 28.3495 = 0.2469 oz, which rounds to about ¼ oz. This is why a standard US yeast packet is printed “0.25 oz (7 g)”: the two labels are the same weight, one in a rounded customary fraction and one in a clean gram figure.

100 g of all-purpose flour. 100 ÷ 28.3495 = 3.5274 oz, which rounds to 3.53 oz. 100 g is a clean, easy-to-picture amount; 3.53 oz is not, because an ounce is a larger unit and 100 g simply does not divide into it evenly. See the all-purpose flour page for how that same 100 g compares in cups.

500 g of granulated sugar. 500 ÷ 28.3495 = 17.637 oz, which rounds to 17.64 oz. Nothing about sugar’s density enters this calculation; it is the same division you would run on 500 g of anything.

Converting Ounces to Grams: The Four Common Baking Amounts

To go the other way, multiply ounces by 28.3495. These four amounts cover most of what you will see printed on US packaging and in older recipes:

1 oz. 1 × 28.3495 = 28.3495 g. This is the base conversion itself.

4 oz (¼ lb). 4 × 28.3495 = 113.398 g. This site’s butter page lists a US stick as 4 oz and 113.5 g, a practical rounding of that same 113.398 g figure.

8 oz (½ lb). 8 × 28.3495 = 226.796 g. That is close to the 227 g this site uses for one US cup of butter (two sticks), since a cup of butter is also close to half a pound.

16 oz (1 lb). 16 × 28.3495 = 453.592 g, commonly rounded to 454 g on packaging and reference charts, including the “approximately 454 g” figure this site gives for a 1 lb box of butter.

Each of those is a straightforward multiplication by the same 28.3495. Nothing about butter’s density, or any other ingredient’s, changes the arithmetic.

Grams vs Ounces at a Glance

Every row is the same division or multiplication by 28.3495. For a broader set of ingredient-specific weights rather than a plain unit table, the baking charts list grams alongside ounces for individual foods.

Why Grams Are More Practical for Baking Precision

An ounce is a comparatively large, coarse unit: roughly 28 times heavier than a gram. That has a direct effect on the numbers you end up working with.

Gram-scale ingredients, the small quantities like salt, spices, yeast, and baking powder, stay whole or near-whole numbers in grams (2 g of salt, 5 g of baking powder) but turn into awkward decimals in ounces (0.07 oz, 0.18 oz). Ounce-scale ingredients, larger amounts like a pound of butter or a bag of sugar, need bigger numbers in grams (453.592 g instead of 16 oz), but grams handle that without difficulty because the metric system scales by simple powers of ten. Doubling 100 g is 200 g. Doubling 3.53 oz means multiplying a decimal, then usually rounding again.

Ounces also carry a habit that grams do not: fractions. Older and specialty recipes commonly write ¼ oz, ½ oz, or ⅛ oz, because customary units were built around halves and quarters rather than tenths. A gram amount almost never needs a fraction; the unit is already small enough that whole numbers or one decimal place cover nearly everything a home baker measures. That is the practical reason this site’s guide to converting grams to cups treats grams as the default baking unit, and it applies just as directly here, in a comparison that has nothing to do with cups at all.

Density Does Not Matter for This Conversion

This is the point that separates grams-to-ounces from almost every other conversion on this site, and it is worth stating plainly: converting grams to ounces, or ounces to grams, never depends on what the ingredient is.

1 oz of flour is 28.3495 g. 1 oz of sugar is 28.3495 g. 1 oz of butter is 28.3495 g. 1 oz of water is 28.3495 g. The factor does not shift for a dense, heavy ingredient like honey or a light, airy one like flour, because mass-to-mass conversions do not involve the space anything occupies, only how much of it there is.

Compare that with converting grams to cups. A cup of all-purpose flour weighs 120 g, a cup of granulated sugar weighs 200 g, and a cup of butter weighs 227 g, three different weights for the exact same cup, because a cup is a measure of volume and each ingredient packs into that volume differently. That difference is density, and it is the reason a grams-to-cups converter needs a separate lookup value for every single ingredient while a grams-to-ounces converter needs only one number, 28.3495, for all of them. If you remember nothing else from this comparison, remember that density governs weight-to-volume conversions and is completely absent from weight-to-weight ones.

Ounces vs Fluid Ounces: Not the Same Unit

Because “ounce” shows up in two different roles in a US kitchen, it is easy to mix them up. Every ounce figure in this article is a unit of weight, exactly the one defined by 28.3495 g. A fluid ounce (fl oz) is an entirely different unit that measures volume, the kind marked on a liquid measuring cup or a jug.

The two are only close in practice for water and water-like liquids, where 1 fl oz happens to weigh almost exactly 1 oz. For anything else, they diverge the same way grams and cups do: 1 fl oz of honey weighs close to 1.5 oz, and 1 fl oz of oil weighs a bit less than 1 oz, because dry and liquid measuring tools measure volume, not weight. This article stays on the weight side of that distinction; if a recipe or label says “fl oz,” it is talking about volume, not the grams-based conversion covered here. See fluid ounces vs ounces for that comparison in full.

Kitchen Scales: Switching Between Grams and Ounces

Nearly every digital kitchen scale has a unit button that toggles between g, oz, lb:oz, and often ml, so choosing grams over ounces costs nothing in convenience. The National Institute of Standards and Technology’s metric kitchen guidance describes weighing ingredients by mass as best practice for accurate results, and King Arthur Baking, whose recipes list weights in both grams and ounces, notes that a scale is more accurate than measuring cups regardless of which weight unit you read.

Given the choice, set the scale to grams. You lose nothing in accuracy, since the scale applies the same 28.3495 factor internally either way, but you gain the whole-number convenience covered above. If a recipe gives ounces and your scale is in grams, multiply by 28.3495 once before you start weighing, or simply toggle the display; both get you to the same number. For scale setup, taring, and resolution, see how to use a kitchen scale for baking.

When You Will Still See Ounces in Baking

Ounces have not disappeared from US kitchens. Butter is sold in 4 oz sticks and 1 lb (16 oz) boxes, baking chocolate bars are commonly labeled in ounces, yeast packets print both ¼ oz and 7 g, and many older American cookbooks give ingredient weights in ounces rather than grams. None of that requires a different method: run the same ounces-to-grams multiplication, or leave your scale in ounces if that matches your reference, since the conversion holds exactly no matter which unit the recipe was written in.

Where ounces get awkward is scaling a recipe up or down. Doubling 12 oz of flour means multiplying a customary fraction-prone number; doubling 340 g is simple addition. For that kind of work, the recipe scaler keeps the math exact regardless of which unit you started in, and the cups to grams converter is the tool to reach for if your real question is about volume rather than this weight-to-weight comparison.

The Short Version

Grams and ounces both measure weight, and one factor converts between them in either direction: divide grams by 28.3495 to get ounces, multiply ounces by 28.3495 to get grams. That factor is fixed for every ingredient, unlike a grams-to-cups conversion, which needs its own density value each time. Grams stay the more practical everyday unit simply because the smaller unit produces cleaner numbers at typical kitchen quantities, but a scale that reads in ounces is exactly as accurate as one that reads in grams. What it is not the same as, ever, is a fluid ounce, which measures volume and belongs to a different conversion problem entirely.