Every day we deal with numbers with **decimal** notation, but there can be these rare occasions when we need to use other systems, such as **hexadecimal**, **octal**, and **binary**.

There are a lot of tutorials about number conversion on the Internet, so in this one, I will only how to convert how to do it in Excel with the built-in functions.

## Convert DEC to HEX value

The Excel function you can use to convert a decimal number to hexadecimal is **DEC2HEX(decimal)**.

As decimal value uses numbers from **0** to **9**, hexadecimal uses the same values plus an additional six: **A** to **F**.

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=DEC2HEX(255) |

This formula returns **FF** (the biggest hexadecimal number that uses only two characters).

The hex value is often used in computer graphics to represent the intensity of three basic colors: red, green, and blue (RGB), from **#000000**, which is black to **#FFFFFF** – white (max intensity of each color).

## Convert HEX to DEC

Similarly, you can convert the value back from hexadecimal to decimal. This time you can use a similar-sounding function: **HEX2DEC**.

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=HEX2DEC("FF") |

The result of this formula is 255.

Remember to take this value into parentheses if it contains a letter. With numbers, it’s not necessary.

## HEX to OCT and vice versa

The octal number system is a positional notation numeral system that uses the digits 0 to 7. It is used in computing because it allows easy representation of binary numbers.

An example of a formula with an octal number:

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=HEX2OCT("FF") |

This formula returns 377.

To convert it back, use this one:

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=OCT2HEX(377) |

## HEX to BIN and vice versa

Binary numbers are often used in computer science and mathematics. This notation is used for representing numerical values using two digits, 0 and 1.

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=HEX2BIN("FF") |

This number equals **11111111** in binary notation.

If you try to convert binary numbers to hexadecimal use this function:

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=BIN2HEX(11101) |

In hex notation it’s **1D**.

## Prefixes (0x) for hex values

Programming languages often use Hexadecimal values, which start with **0x**. For example, **0xFF** instead of just **FF**.

If you want to convert a hexadecimal number to decimal or any other notation, you will have to remove any **0x** prefixes before converting it.

There are a few different methods you can use to do this: **Flash Fill**, **Text to Columns**, or even **Find & Replace**. However, the best long-term solution would be to create a formula that would solve the problem for you automatically.

That is what we’ll do:

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=RIGHT(A2,LEN(A2)-2) |

This formula works in a way that it takes a value from cell **A2** and keeps 2 characters (length of the text inside A2 – 2) from the right side.