# Set cardinality calculator

World's simplest set tool
With this online application, you can quickly find the cardinality of the given set. The input set can be written in any notation and you can adjust its style in the options. You can also use several different cardinality calculation modes to find the size of regular sets (with non-repeated elements) and multisets (with repeated elements). You can also exclude empty elements from the count. Created by team Browserling.

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## What is a set cardinality calculator?

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This browser-based program finds the cardinality of the given finite set. For any given set, the cardinality is defined as the number of elements in it. For example, if the set A is {0, 1, 2}, then its cardinality is 3, and the set B = {a, b, c, d} has a cardinality of 4. The set's size is denoted by the vertical bar characters, for example, |A| = 3 and |B| = 4. If you know the cardinality of sets, then you can compare them by size and determine which set is bigger. If the cardinality of two sets is the same, then there is a bijection between them. The input set can be specified in the standard set format, using curly brace characters { } on the sides and a comma as the element separator (for example {1, 2, 3}) and in a non-standard set format (for example [1 2 3] or <1*2*3>). To customize the input style of your set, use the input set style options. You can change the element separator and the open-set and close-set characters. If the input set is a multiset (a set that allows including the same element several times), then two additional cardinality counting modes can be useful to you. The "Count Only Unique Elements" mode counts each item only once. If any of the elements in the set are duplicated, then their copies are not included in the count. For example, the cardinality of the set A = {a, a, b} in this counting mode is 2 because "a" is a repeated element. The other cardinality counting mode "Count Only Duplicate Elements" does the opposite and counts only copies of elements. In this case, the set A = {a, a, b} has the cardinality of 1 because the element "a" is the only element that is repeated. All counting modes are connected via the relation "total elements = unique elements + repeated elements". The last checkbox "Include Empty Elements" can be very helpful in situations when the set contains empty elements. With this option, you can either include or exclude empty elements from the count. Setabulous!

## Set cardinality calculator examples

Click to useCardinality of a Set of Primes

In this example, we paste a set of primes less than 100 in the input box and we want to find how many primes there are in this interval. The entered set uses the standard set style, namely comma-separated elements wrapped in curly brackets, so we use the comma as the number separator and braces { } as set-open and set-close symbols. We select the mode that counts all the elements in the set and find that the cardinality of this set is 25, which means there are 25 primes less than 100.

{2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97}

25

**Required options**

The element separator symbol
that goes between elements.

Open set symbol.

Close set symbol.

Count all elements in the
input set.

If the set contains blank
elements, then include
them in the count.

Size of a Set of Equations

The input set in this example is a collection of simple math expressions in variables x and y. If you look closely, you can see that some of the expressions are duplicated, which means that the input set is a multiset. To avoid counting repeated expressions, we activate the "Count Unique Elements" option. Also, to adapt the program to the non-standard set format that uses square brackets and semicolons, we put a semicolon in the set element delimiter field and square brackets in the fields for left and right set symbols.

[x; y; x + y; x + 1; y + 1; 2x; 2y; 2x + 1; 2y + 1; x²; y²; x² + 1; y² + 1; x² + x; y² + y; x² + x + 1; y² + y + 1; x; y + 1; 2y; x² + 1; y² + y; x² + x + 1]

17

**Required options**

The element separator symbol
that goes between elements.

Open set symbol.

Close set symbol.

If the input set is a multiset
then count only the unique
elements in it.

If the set contains blank
elements, then include
them in the count.

Unicode Checkmarks Set

In this example, the elements of the set are Unicode checkmarks that are separated by dashes. Each set element occurs at least two times and there are many empty elements in the set (between two dashes). We exclude the blank items from the count by turning off the empty element checkbox option. By using the "Count Repeated Elements" mode, we find the number of duplicate checkmarks in the set, which is 12.

✓-✅-✕- -☑-✅-✘--✔-✖-✔-✅-✘-☑--❌-✔-✗--✅-✗-✓- -✖-❌-✘

12

**Required options**

The element separator symbol
that goes between elements.

Open set symbol.

Close set symbol.

If the input set is a multiset
then count only the duplicate
elements in it.

If the set contains blank
elements, then include
them in the count.

Pro tips
Master online set tools

You can pass input to this tool via

__?input__query argument and it will automatically compute output. Here's how to type it in your browser's address bar. Click to try!
https://onlinesettools.com/find-set-cardinality

__?input__=%7B2%2C%203%2C%205%2C%207%2C%2011%2C%2013%2C%2017%2C%2019%2C%2023%2C%2029%2C%2031%2C%2037%2C%2041%2C%2043%2C%2047%2C%2053%2C%2059%2C%2061%2C%2067%2C%2071%2C%2073%2C%2079%2C%2083%2C%2089%2C%2097%7D&input-separator=%2C%20&input-open-set=%7B&input-close-set=%7D&count-all=true&count-empty=true
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Convert a set with repeated elements to a standard set.

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Convert a standard set to a multiset with repeated elements.

Convert a Set to a List

Create a list from the given set.

Convert a List to a Set

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Create an array from the given set.

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Create a set from the given array.

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Repeat set elements multiple times.

Print Duplicate Set Elements

Find all duplicate elements in a set.

Remove Duplicate Set Elements

Delete all duplicate elements from a set (leave unique).

Print Unique Set Elements

Find all unique elements in a set.

Remove Unique Set Elements

Delete all unique elements from a set (leave duplicates).

Remove Empty Set Elements

Delete empty elements (zero-length elements) from a set.

Find Set Depth

Calculate how many levels of subsets a set has.

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Decrease subset nesting.

Truncate a Set

Remove elements from a set and make it smaller.

Truncate Set Elements

Shorten all set elements to the given length.

Expand a Set

Add elements to a set and make it bigger.

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Split a set into a certain number of subsets.

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Merge multiple sets together to form one large set.

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Randomly change the order of elements in a set.

Select a Random Set Element

Pick a random element from the given set.

Select a Random Subset

Pick a random subset of the given set.

Generate an Empty Set

Create a set with no elements.

Generate a Digit Set

Create a set that contains digits.

Generate a Number Set

Create a set that contains numbers.

Generate an Integer Set

Create a set that contains integers.

Generate a Decimal Set

Create a set that contains decimal fractions.

Generate a Letter Set

Create a set that contains letters.

Generate a Character Set

Create a set that contains characters.

Generate a Word Set

Create a set that contains words.

Generate a String Set

Create a set that contains strings.

Generate a Text Set

Create a set that contains text.

Generate a Sentence Set

Create a set that contains sentences.

Generate a Random Set

Create a set that contains random elements.

Generate a Custom Set

Create a custom set with custom elements and custom size.

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Create a set with infinitely many elements.

Generate a Finite Set

Create a set with a finite number of elements.

Change Set Notation

Change the open-set, close-set, and element separator symbols.

Change Set Size

Add or remove set elements to make it a certain size/length.

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Launch a Zalgo attack on a set and destroy it.

Compare Sets

Find all differences between two or more sets.

Symmetrize a Set

Convert a regular set to a symmetric multi-set.

Color a Set

Add colors to set elements.

Visualize a Set

Create an abstract visualization of a set.

Convert a Set to an Image

Create a downloadable picture from a set.

Print Set Analytics

Analyze a set and print its statistics.

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