How Many Grams in an Ounce

Have you ever wondered how many grams in an ounce?  We know this might not be top of list in the grand scheme of things but what’s that thing they say about knowledge again? ”No knowledge is wasted”, so at least, that is one legit reason why you should bother to know how many grams is in an ounce.

We will through this article be providing answers to that question, while also offering a lot more information that you will definitely find useful. So, hang on with us and read through.

First things first, as it’s our culture, we will start by defining relevant terms.

What is a Gram?

The gram is the basic unit of measurement for weight and mass in the metric and SI measurement systems. It is often used to weigh small items, such as dry goods in a kitchen. The only way to accurately measure in grams is to use a scale. Other tools, such as kitchen cups and spoons, provide a rough estimate.

A gram is also a unit of mass in the metric system defined as one thousandth (1 x 103) of a kilogram. It is a unit of measurement used to measure very light objects.

To add to that, in very simple terms that will make you understand even better, a gram is a basic unit you use to measure liquid or dry ingredients for recipes in cooking and baking. You can use a measuring cup or measuring spoon to estimate amounts, but for the most accurate way to measure ingredients, you should use a digital kitchen scale.

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The only recognised International System of Units (SI) fo grams is “g”, following the numeric value with a space, I.e  “350 g” to stand for “350 grams” in the English language. The SI does not support the use of abbreviations such as “gr” (which is the symbol for grains), “gm” (“g⋅m” is the SI symbol for gram-metre) or “Gm” (the SI symbol for gigametre). So it is just a simply and ordinary. ”g”.

What is an Ounce

The term “ounce” is of the Latin origin from the word “uncia” which means “a twelfth part.” It can also be used in several different systems of measurements, but the most widely used systems for “ounce” are the international troy ounce and the international avoirdupois ounce. This suggests that one avoirdupois ounce is approximately 28.3495231 grams.

Similarly, we use two systems in measuring fluid ounces. For example, one unit of a fluid ounce is approximately 29.5735297 ml. using the U.S Customary system while it is just approximately 28 ml. using the Imperial system. This makes one beg for the use of one unified, standard system of measurement which is not entirely applicable today.

To make it easier, an Ounce is;

  • A unit of weight equal to 437.5 grains or 1/16 pound (28.35 grams) avoirdupois.
  • A unit of 480 grains, 1/12 pound (31.1 grams) troy or apothecaries’ weight.
  • A fluid ounce.
  • A small quantity or portion.

In discussing how many grams are in an ounce,I think is important that we clearly understand that there are two types of ounces, we have the fluid ounce and the regular (dry) ounce.

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What is a Fluid Ounce

The US fluid ounce is a unit of volume equal to 1/16 of a pint or 1/8 of a cup. One fluid ounce is equal to just under 29.6 milliliters, but in nutrition labeling, one fluid ounce is rounded to exactly 30 milliliters.

The fluid ounce was originally the volume occupied by one ounce of some substance, for example, wine (in England) or water (in Scotland). The ounce in question also varied depending on the system of fluid measures, such as that used for wine versus ale.

Various ounces were used over the centuries, including the tower ounce, troy ounce, avoirdupois ounce, and ounces used in international trade, like the Paris troy, made the situation further complicated by the medieval practice of “allowances”, whereby a unit of measure was not necessarily equal to the sum of its parts. For example, the 364-pound woolsack (165 kg) had a 14-pound allowance (6.4 kg) for the weight of the sack and other packaging materials.

Fluid ounces are a subcategory of ounces but the common term ounce is used to address both of these units and this is what leads to a  misunderstanding among the buyers and seller

To that effect, we must discuss what the differences between a fluid ounce and an ounce are.

Difference Between fluid Ounces and Ounces.

The difference between a fluid ounce and an ounce is that a fluid ounce is used for the measurement of fluids and their volumetric properties, whereas an ounce is used for the measurement of the mass and weight of the solid materials.

A fluid ounce is a standard unit for measuring the capacity of a liquid. This capacity is generally volume. It is very widely used in the USA and other western countries to measure the number of liquids. A fluid ounce is the one we are referring to whenever we ask how many ounces are in a liter.

Meanwhile, an ounce is a standard unit for the primary measurement of the mass of a physical quantity. It is further subdivided into many categories for different types of materials and can even be used to describe the amount of food a person takes.

When you look through the pack of your liquid products like can drinks or milk sold in liters, you will often find the abbreviation ”fl oz” that is because fluid ounce is represented by fl oz, whereas an ounce is represented by an ordinary oz.

How many Ounce in a gram

How Many Grams in an Ounce

If you’re wondering about a dry ounce, the answer is pretty clear cut. One dry ounce adds up to 28.35 grams, or 28.3495231 grams, if you want to go all out on the digits. Like we earlier mentioned about the two types of Ounces, dry ounces are measurements of weight, generally calculated by placing the material on a scale. Whereas, measuring fluid ounces, is not that straightforward.

Fluid ounces (abbreviated as fl. oz.) are all about volume, and volume requires insight into the density of a material for an accurate reading. For example, take two measuring cups. Fill one with let’s say salt to the 1-cup line, then pour a fruit drink into the other cup, to the same 1-cup level. The two substances will have different densities  and different weights.

We explained How Many Bottles of Water Equal a Gallon in this article.

How to Convert Ounces to Grams

  • 1 ounce (oz) is equal to 28.34952 grams (g).
  • 1 oz = 28.34952 g
  • The mass m in grams (g) is equal to the mass m in ounces (oz) times 28.34952:
  • m(g) = m(oz) × 28.34952


Here’s how to convert 10 oz to grams:

m(g) = 10 oz × 28.34952 = 198.44664 g

How to Convert Grams to Ounces

1 gram (g) is equal to 0.03527396195 ounces (oz).

1 g = 0.03527396195 oz

The mass m in ounces (oz) is equal to the mass m in grams (g) divided by 28.34952:

m(oz) = m(g) / 28.34952


Here’s how to convert 5g to Ounces:

m(oz) = 5 g / 28.34952 = 0.17637 oz

How to Convert Grams to Fluid Ounces

Remember we said there are two types of ounces, so here’s how to convert a gram measurement to a fluid ounce measurement.

You will just divide the weight by 29.57353 times the density of the ingredient or material.

You can use this simple formula to convert:

Fluid ounces = grams
              29.57353 × ingredient density

Thus, the weight in fluid ounces is equal to the grams divided by 29.57353 times the density of the ingredient or material.

Here’s how to convert 5 grams to fluid ounces for an ingredient with a density of 0.7 g/mL.
5 g = 529.57353 × 0.7 = 0.241528733584 fl oz

Quick Conversions of Grams to Ounces

Grams (g)      Ounces (oz)
0 g.                 0 oz
1 g                  0.0353 oz
2 g                  0.0706 oz
3 g                  0.1058 oz
4 g                  0.1411 oz
5 g                  0.1764 oz
6 g.                 0.2116 oz
7 g.                 0.2469 oz
8 g.                 0.2822 oz
9 g.                 0.3175 oz
10 g.               0.3527 oz
20 g                0.7055 oz
30 g.               1.0582 oz
40 g.               1.4110 oz
50 g.               1.7637 oz
60 g.               2.1164 oz
70 g.               2.4692 oz
80 g                2.8219 oz
90 g                3.1747 oz
100 g              3.5274 oz

Items that Weigh a Gram

Finding objects that weigh a gram can be challenging, and that is because a gram is a very light weight to measure, and there are few things with the exact measurement. But we have been able to gather a few items that weigh a gram to help you better understand.

1. A Dollar bill

The dollar bill, which is the American currency is popularly well known and it weighs one gram. Of course, this is only peculiar to the dollar as  currencies in other countries may not have the same dimensions, density of ink, or weight of paper, so we cannot  generalize  that all  paper currencies are 1 gram.

2. A Raisin

We mean just a plain brown raisin, not one already decked in chocolate or some other flavouring, but then again as  raisins naturally vary in size, shape, and even water content, this cannot be applied to all raisins, but most will fit this category of weight.

3. A Paper Clip

Here, we mean the ordinary not decorative paper clip. When you think of a paperclip, you probably have the picture of a small or large paperclip, but seeking an exemplar for a gram, it is important to note the paperclip will be the small size, not jumbo or decorative.

4. A Pen Cap
Remember your pen cap from back in the days. The cap with the little hole at the end of it that was the signature of Bic caps. Well, that little piece of plastic weighs a gram. This measurement is exclusive to the Bic crystal cap and cannot be applied to all pen caps.
  5.  Thumbtacks

The weight of a standard or normal thumbtack will be one gram. This isn’t referring to the new decorative thumbtacks. These are the everyday clear or colored plastic thumbtacks.

Items that Weigh an Ounce

1. A New Wooden Pencil

It will be very rare for anyone to say they haven’t seen a pencil before, I’m talking about those old school HB pencils that you need to take tests in school.

If you have one that has never been used before, then there’s a pretty good chance that it weighs around one ounce. But it has to be never used and it has to be one of those wood pencils.

Mechanical pencils won’t work because they don’t weigh the same. And already used pencils have lost some weight due to shortening when used and sharpened.

2. A slice of bread

Generally speaking, your average slice of bread weighs around an ounce. The loaves could vary in size and that will affect the exact weight from brand to brand.

But for the most part, your standard slice of sandwich bread is approximately one ounce in weight.

For the best chance at a slice that is as close to one ounce as possible, go for a normal size slice of whole wheat bread.

3. A CD

This is another common thing that helps you determine how much an Ounce weighs.

If you take that CD out of the CD case, then you have around an ounce in weight when you hold it in your hand.

But you must remember to remove the CD from the case. The CD case itself weighs around an ounce.

So, if you leave the CD in its case, then you’re looking at a weight of around two ounces right there

4 .A Standard Bic Biro

So we said that the cap of a standard  Bic measures a gram, well the entire Bic itself measures an Ounce. So, if you can find one of those in a drawer at home, then you’ll have a pretty good idea of how much an ounce weighs.


Both the gram and Ounce are units that are used to measure the volumes and weights  of things, but the gram is a much smaller weight compared to an ounce, as can be clearly seen through the examples of items used.

We hope that this article has helped you and has provided you with the information you needed.

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