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Dozen vs. Kilogram — What's the Difference?

By Maham Liaqat & Fiza Rafique — Updated on May 1, 2024
A dozen is a unit of count for 12 items, while a kilogram is a metric unit of mass equivalent to 1,000 grams.
Dozen vs. Kilogram — What's the Difference?

Difference Between Dozen and Kilogram


Key Differences

A dozen is a term used to count items, traditionally used for things easily grouped into 12s, such as eggs or donuts. Whereas, a kilogram is a unit of mass in the International System of Units (SI), primarily used for measuring the weight of an object.
The use of a dozen is largely consistent globally, always representing the quantity of 12. On the other hand, the kilogram is standardized internationally as exactly equal to the mass of a specific physical standard, and is used in scientific as well as everyday contexts.
When purchasing items like bakery goods or stationery, a dozen provides a quick reference to quantity without weighing. In contrast, kilograms are used to determine the weight of items like fruits, vegetables, and meat at a market.
The concept of a dozen stems from old trading practices and is embedded in everyday language and commerce. Conversely, the kilogram is based on scientific definitions and is crucial for precise measurements in industries and sciences.
Dozens simplify bulk purchasing or describing quantities in everyday terms without reference to actual weight. Kilograms, however, provide a necessary measure for scenarios where the weight and mass are critical, such as in cooking or shipping.

Comparison Chart


Count of 12 items
Metric unit of mass, 1,000 grams

Usage Context

Quantifying countable items
Measuring weight or mass of items

Related to

Trading and everyday purchases
Science, commerce, and daily use


Fixed count
Precise measurement requiring scales

Global Standard

Commonly understood universally
Defined and standardized internationally

Compare with Definitions


Used for counting.
I need a dozen pencils for the class.


Standardized internationally.
Kilograms are used globally for weight.


Common in trade.
A dozen roses are often sold together.


Crucial for precision.
Precise kilograms are needed for laboratory balances.


A group of twelve.
She bought a dozen eggs.


A unit of mass in the metric system.
The package weighs three kilograms.


Not linked to mass.
A dozen chairs were set up for the meeting.


Equivalent to 1,000 grams.
That bag of rice is half a kilogram.


Simplifies counting.
We ordered two dozen cookies for the party.


Used in science.
The chemical was measured out in kilograms.


A dozen (commonly abbreviated doz or dz) is a grouping of twelve. The dozen may be one of the earliest primitive integer groupings, perhaps because there are approximately a dozen cycles of the Moon, or months, in a cycle of the Sun, or year.


The kilogram (also kilogramme) is the base unit of mass in the International System of Units (SI), the metric system, having the unit symbol kg. It is a widely used measure in science, engineering and commerce worldwide, and is often simply called a kilo in everyday speech.


Pl. dozen Abbr. doz. or dz. A set of 12.


Abbr. kg The base unit of mass in the International System, equal to 1,000 grams (2.2046 pounds). See Table at measurement.


Dozens An indefinite, large number
Dozens of errands to run.


Kilogram force.




In the International System of Units, the base unit of mass; conceived of as the mass of one litre of water, but now defined by taking the fixed numerical value of the Planck constant h to be 6.626 070 15 × 10-34 when expressed in units of kg⋅m2⋅s−1. Symbol: kg


A set of twelve.
Can I have a dozen eggs, please?
I ordered two dozen doughnuts.
There shouldn't be more than two dozen Christmas cards left to write.
Pack the shirts in dozens, please.


(proscribed) The unit of weight such that a one-kilogram mass is also a one-kilogram weight.


A large, unspecified number of, comfortably estimated in small multiples of twelve, thus generally implied to be significantly more than ten or twelve, but less than perhaps one or two hundred; many.
There must have been dozens of examples just on the first page.
There were dozens and dozens of applicants before the job was posted.


A measure of weight, being a thousand grams, equal to 2.2046226 pounds avoirdupois (15,432.34 grains). It is equal to the weight of a cubic decimeter of distilled water at the temperature of maximum density, or 39° Fahrenheit.


(metallurgy) An old English measure of ore containing 12 hundredweight.


One thousand grams; the basic unit of mass adopted under the Systeme International d'Unites;
A kilogram is approximately 2.2 pounds


(bingo) twelve


A collection of twelve objects; a tale or set of twelve; with or without of before the substantive which follows.


An indefinite small number.


The cardinal number that is the sum of eleven and one


Denoting a quantity consisting of 12 items or units

Common Curiosities

How is the kilogram defined scientifically?

The kilogram is defined by the International System of Units through a specific physical prototype.

Can the measurement of a dozen vary?

No, a dozen strictly refers to twelve items, regardless of the type of item.

What items are commonly sold by the dozen?

Items like eggs, flowers, and pastries are commonly sold by the dozen.

Is the kilogram used in all countries?

Most countries use the kilogram, except for a few like the United States that use pounds.

How many kilograms are in a metric ton?

There are 1,000 kilograms in a metric ton.

How precise is a kilogram in scientific terms?

Kilograms are extremely precise and essential for scientific measurements.

Why is the dozen a popular quantity for sale?

The dozen allows for bulk sale and convenience in counting and distribution.

What is a baker's dozen?

A baker’s dozen refers to 13, one more than a standard dozen, traditionally given as a bonus.

Are there subunits of kilograms?

Yes, kilograms can be divided into grams, with 1,000 grams making up a kilogram.

How does the dozen help in everyday shopping?

It simplifies the purchase of small to moderate quantities of items without weighing.

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Author Spotlight

Written by
Maham Liaqat
Co-written by
Fiza Rafique
Fiza Rafique is a skilled content writer at, where she meticulously refines and enhances written pieces. Drawing from her vast editorial expertise, Fiza ensures clarity, accuracy, and precision in every article. Passionate about language, she continually seeks to elevate the quality of content for readers worldwide.

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