BASE Function in Excel: Number in Any Base

📎 This article includes 1 downloadable practice file ↓

EngineeringLevel: IntermediateAvailable in: Excel 2013+

In this article

1. Syntax
2. Examples
3. Example 1
4. Example 2
5. BASE in practice
6. Where you will use it
7. Worked example
8. Mistakes people make
9. Related functions
10. Continue learning

BASE converts to any base from 2 to 36 and handles much bigger numbers than DEC2BIN.

Syntax

=BASE(number, radix, [min_length])

Argument	What it means
radix	2 to 36.

Examples

Example 1

=BASE(255, 2)

11111111.

Example 2

=BASE(ROW(), 36, 4)

Short 4-character IDs like 00A7.

BASE in practice

Where you will use it

• Write numbers in binary or hex for bit masks
• Generate short codes in base 36
• Teach number systems

Worked example

Number	Radix	Formula	Result
255	2	=BASE(A2,B2)	11111111
255	16	=BASE(A3,B3)	FF
123456	36	=BASE(A4,B4)	2N9C

Results calculated in Excel.

Mistakes people make

Mistake	What to do instead
Expecting leading zeros	Add the min_length argument: BASE(5,2,8) gives 00000101
Negative numbers	BASE accepts only 0 or more

Related functions

DECIMAL · DEC2BIN

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📎 Practice files for this article

• 📗
  Practice workbook: Engineering & conversion15 tasks on realistic sales data — type your formula, the Check column turns green when it is right. Answers sheet included.
  ⬇ XLSX · 34 KB

Free to use for learning. Files with macros (.bas) are plain text — import them with Alt+F11 → File → Import File, and always test on a copy.