Difference Wiki

Grams vs. Ounces: What's the Difference?

Edited by Aimie Carlson || By Janet White || Published on January 7, 2024
Grams is a metric unit of mass equal to one-thousandth of a kilogram. Ounces is an imperial unit of weight, with 1 ounce equal to 28.35 grams.

Key Differences

Grams are a unit of mass in the metric system, widely used globally, especially in scientific and culinary contexts. Ounces, part of the imperial system, are commonly used in the United States for measuring weight, particularly in cooking and mailing.
One gram is defined as one-thousandth of a kilogram, making it a base unit for mass in the metric system. An ounce is equal to approximately 28.35 grams, making it a larger unit than a gram.
Grams are often used in scientific measurements due to their precision and universal standardization. Ounces are frequently used in recipes and food packaging in countries like the United States and the United Kingdom.
The use of grams allows for easy conversion within the metric system, such as kilograms and milligrams. Ounces, being part of the imperial system, require conversion factors when used in conjunction with other units like pounds.
Digital scales often have the option to measure in both grams and ounces, catering to different measurement preferences and international standards.

Comparison Chart



Base Unit

1/1000 of a kilogram
1/16 of a pound


1 ounce ≈ 28.35 grams
1 gram ≈ 0.035 ounces

Common Usage

Global, especially in science
Predominantly in the U.S.


Higher precision in small quantities
Less precise for small quantities

Grams and Ounces Definitions


Used for precise scientific measurements.
The laboratory experiment required 50 grams of the substance.


Used in postal services for determining postage.
The letter was under 2 ounces and required minimal postage.


A metric unit of mass, 1/1000th of a kilogram.
The recipe required 500 grams of flour.


Common in U.S. cooking measurements.
The recipe called for 4 ounces of cream cheese.


Integral in pharmaceuticals for dosing accuracy.
The medication was prescribed in 10-gram doses.


An imperial unit of weight, 1/16th of a pound.
The package weighed 8 ounces.


Essential in jewelry for measuring precious metals.
The gold necklace weighs 25 grams.


Important in retail for product packaging.
The cereal box contains 12 ounces of product.


Common in cooking measurements outside the U.S.
I measured 200 grams of sugar for the cake.


Used in fabric weight measurement.
The fabric was 10 ounces per square yard.


A grandmother.


A unit of weight in the US Customary System, an avoirdupois unit equal to 437.5 grains (28.35 grams).


Plural of gram


A unit of apothecary weight, equal to 480 grains (31.103 grams). See Table at measurement.




A fluid ounce. See Table at measurement.


A tiny bit
Not an ounce of sympathy.


See snow leopard.


Plural of ounce


How many grams are in an ounce?

There are approximately 28.35 grams in an ounce.

What is an ounce?

An ounce is an imperial unit of weight, equal to 1/16th of a pound.

What is a gram?

A gram is a metric unit of mass, equal to 1/1000th of a kilogram.

Are grams used in cooking?

Yes, grams are widely used in cooking, especially outside the U.S.

What is more precise, grams or ounces?

Grams offer more precision, especially for smaller quantities.

Is the ounce used in scientific measurements?

Ounces are less common in scientific measurements compared to grams.

Why are grams important in pharmacy?

Grams provide precise dosing in pharmaceuticals.

Can you convert ounces to grams?

Yes, to convert ounces to grams, multiply by 28.35.

Do digital scales measure in both grams and ounces?

Many digital scales have the option to measure in both grams and ounces.

Do dietitians use grams or ounces?

Dietitians may use both, depending on the context and region.

Do U.S. recipes use grams or ounces?

U.S. recipes often use ounces, while grams are used in many other countries.

How do I convert grams to ounces?

To convert grams to ounces, divide by 28.35.

Are ounces used in baby weight measurement?

In the U.S., baby weight is often measured in ounces and pounds.

Are ounces used in mailing services?

Yes, ounces are commonly used in mailing services, especially in the U.S.

How is jewelry weight measured?

Jewelry weight is often measured in grams.

What industries use ounces?

Ounces are used in industries like food, postal services, and retail.

Can I measure liquids in grams?

Yes, liquids can be measured in grams, especially for precise culinary and scientific purposes.

Are grams and ounces interchangeable?

They are not directly interchangeable and require conversion.

Why are grams used in science?

Grams are used in science for their precision and standardization.

Is fabric weight measured in ounces?

Yes, fabric weight is often measured in ounces per square yard.
About Author
Written by
Janet White
Janet White has been an esteemed writer and blogger for Difference Wiki. Holding a Master's degree in Science and Medical Journalism from the prestigious Boston University, she has consistently demonstrated her expertise and passion for her field. When she's not immersed in her work, Janet relishes her time exercising, delving into a good book, and cherishing moments with friends and family.
Edited by
Aimie Carlson
Aimie Carlson, holding a master's degree in English literature, is a fervent English language enthusiast. She lends her writing talents to Difference Wiki, a prominent website that specializes in comparisons, offering readers insightful analyses that both captivate and inform.

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