⚡ Free ASCII Converter

ASCII to Octal Converter

Convert ASCII text to octal character codes instantly. Enter letters, numbers, spaces, punctuation, or standard ASCII control characters and get the exact base-8 code for every character.

✓ Free ✓ No sign-up ✓ 3-digit octal codes ✓ Character mapping

TXT→OCT

ASCII → Octal

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ASCII Text Characters → octal codes

Enter standard ASCII characters with code values from 0 through 127.

Try:

✓ Octal Result

Three-digit octal code for each ASCII character

Characters 0

Octal Codes 0

Octal Digits 0

Character mapping:

What Is an ASCII to Octal Converter?

An ASCII to octal converter changes standard ASCII characters into the octal representation of their numeric character codes. ASCII assigns a decimal number from 0 through 127 to each supported character.

That numeric code can be written in any number system. For example, uppercase A has ASCII decimal value 65. Decimal 65 written in octal is 101, so ASCII A can be represented as octal 101.

BinaryCon converts each character separately and uses a three-digit octal format, which keeps byte-oriented values aligned and easy to distinguish.

ASCII character

A character such as A, z, 5, space, punctuation, or a control code.

Octal code

The same ASCII numeric value represented using base-8 digits 0 through 7.

How to Use the ASCII to Octal Converter

Enter ASCII text

Type a character, word, phrase, sentence, number, space, or punctuation.

Read each ASCII code

BinaryCon identifies the decimal ASCII value assigned to each character.

Convert the value to base 8

Each decimal ASCII code is converted to octal and padded to three digits.

Review the mapping

For shorter text, see the character, decimal code, and octal code together.

Copy the result

Use the output for programming, Unix-related work, legacy systems, data inspection, coursework, or another BinaryCon tool.

Worked Example: Convert A to Octal

Uppercase A has ASCII decimal code: A → 65 Convert decimal 65 to octal: 65₁₀ = 101₈ Therefore: A → 101

Worked Example: Convert ABC to Octal

ASCII decimal values: A → 65
B → 66
C → 67 Convert each to octal: 65 → 101
66 → 102
67 → 103 Final result: ABC → 101 102 103

Example: Convert Hello to Octal

Character	Decimal	Octal	Hex
H	72	`110`	48
e	101	`145`	65
l	108	`154`	6C
l	108	`154`	6C
o	111	`157`	6F

Final octal output: 110 145 154 154 157

Common ASCII to Octal Values

Character	Decimal	Octal
space	32	`040`
!	33	`041`
0	48	`060`
1	49	`061`
9	57	`071`
A	65	`101`
B	66	`102`
Z	90	`132`
a	97	`141`
b	98	`142`
z	122	`172`
?	63	`077`

Uppercase ASCII A–Z in Octal

Letter	Octal	Letter	Octal
A	101	N	116
B	102	O	117
C	103	P	120
D	104	Q	121
E	105	R	122
F	106	S	123
G	107	T	124
H	110	U	125
I	111	V	126
J	112	W	127
K	113	X	130
L	114	Y	131
M	115	Z	132

Lowercase ASCII a–z in Octal

Letter	Octal	Letter	Octal
a	141	n	156
b	142	o	157
c	143	p	160
d	144	q	161
e	145	r	162
f	146	s	163
g	147	t	164
h	150	u	165
i	151	v	166
j	152	w	167
k	153	x	170
l	154	y	171
m	155	z	172

ASCII Digits 0–9 in Octal

Character	Decimal	Octal
0	48	`060`
1	49	`061`
2	50	`062`
3	51	`063`
4	52	`064`
5	53	`065`
6	54	`066`
7	55	`067`
8	56	`070`
9	57	`071`

Why ASCII Character 5 Is Octal 065

The typed character 5 is represented using its ASCII character code rather than mathematical value five.

Mathematical value: 5₁₀ = 5₈ ASCII text character: “5” → decimal 53 → octal 65 Byte-style octal display: 065

This distinction is important when text data is processed by software.

What Is Space in Octal ASCII?

ASCII space has decimal code 32. In octal, decimal 32 is 40, conventionally displayed here as 040.

space → 32₁₀ → 040₈

Therefore:

A B → 101 040 102

Why Use Three Digits for ASCII Octal?

Standard ASCII values range from decimal 0 to 127. Decimal 127 is octal 177, so every ASCII code fits within three octal digits.

Padding smaller codes with leading zeros gives consistent output:

TAB → 011
space → 040
A → 101
DEL → 177

This three-digit format is also familiar from traditional octal byte and escape notation.

ASCII Control Codes in Octal

Control	Decimal	Octal	Meaning
NUL	0	000	Null
BEL	7	007	Bell
BS	8	010	Backspace
TAB	9	011	Horizontal tab
LF	10	012	Line feed
CR	13	015	Carriage return
ESC	27	033	Escape
DEL	127	177	Delete

ASCII Octal vs Decimal, Hex, and Binary

Character	Decimal	Octal	Hex	Binary
A	65	101	41	`01000001`
B	66	102	42	`01000010`
a	97	141	61	`01100001`
0	48	060	30	`00110000`
space	32	040	20	`00100000`
!	33	041	21	`00100001`

ASCII to Octal Examples

ASCII Text	Octal Output
A	`101`
ABC	`101 102 103`
Hi	`110 151`
Hi!	`110 151 041`
Hello	`110 145 154 154 157`
World	`127 157 162 154 144`
ASCII	`101 123 103 111 111`
123	`061 062 063`

ASCII, Octal, and Escape Sequences

Octal notation has historically been used for character and byte escape values in programming environments. For example, character A with octal code 101 may appear conceptually as an octal escape such as \101 in languages or tools that support that notation.

Exact syntax depends on the language. Modern programming environments may prefer hexadecimal or Unicode escape notation instead, so always follow the rules of the specific language or parser being used.

Note: the converter outputs octal numeric character codes. It does not automatically add programming-language escape prefixes.

ASCII vs Unicode

ASCII contains only 128 standard code values, while Unicode supports a much larger set of characters from languages around the world as well as symbols and emoji.

Standard ASCII characters remain important because Unicode encodings such as UTF-8 preserve their values exactly for the first 128 code points.

Best use: use this converter for strict standard ASCII text. For characters outside ASCII, use a Unicode-aware conversion tool.

Where ASCII to Octal Conversion Is Useful

Programming

Inspect text codes in octal or prepare values for environments and legacy syntax that use octal character notation.

Unix and systems

Octal notation remains familiar in Unix-related contexts and low-level system documentation.

Legacy computing

Older systems and documentation may represent character codes or machine values in octal.

Computer science education

Convert one ASCII code among decimal, binary, hexadecimal, and octal to better understand number-system representation.

Common ASCII to Octal Conversion Mistakes

Using the numeric value of a typed digit

Character “5” has ASCII octal code 065, not octal 5.

Ignoring leading zeros

Numeric value 11 octal and displayed byte code 011 are equivalent, but three-digit output makes ASCII byte boundaries clearer.

Ignoring spaces

A space is a valid character with octal ASCII code 040.

Trying to encode non-ASCII Unicode characters

Standard ASCII is limited to values from 0 through 127.

Related BinaryCon Tools

Convert ASCII into binary, decimal, or hexadecimal, reverse other representations back to text, or continue with Unicode tools.

ASCII to Octal Converter FAQs

How do you convert ASCII to octal?

Find the decimal ASCII code of each character and convert that numeric value from base 10 to base 8. For example, uppercase A is decimal 65, which equals octal 101.

What is A in ASCII octal?

Uppercase A has decimal ASCII value 65, which is octal 101.

What is lowercase a in octal ASCII?

Lowercase a has decimal ASCII code 97 and octal code 141.

What is ABC in ASCII octal?

A is 101, B is 102, and C is 103. Therefore ABC → 101 102 103.

What is Hello in octal ASCII?

Hello converts to 110 145 154 154 157.

What is a space in ASCII octal?

Space has decimal code 32, which is octal 40. BinaryCon displays it as the three-digit code 040.

What is ASCII 0 in octal?

Text character “0” has decimal ASCII value 48, which is octal 060.

What is ASCII 9 in octal?

Text character “9” has decimal ASCII value 57, which equals octal 071.

What is newline in ASCII octal?

Line feed has decimal ASCII value 10 and octal code 012.

What is carriage return in ASCII octal?

Carriage return has decimal code 13 and octal ASCII code 015.

Why are ASCII octal values shown with three digits?

All standard ASCII values fit into three octal digits because the maximum ASCII value, decimal 127, is octal 177. Padding smaller values produces a consistent character-code format.

What is octal 101 in ASCII?

Octal 101 equals decimal 65, which corresponds to uppercase A in ASCII.

What is octal 141 in ASCII?

Octal 141 equals decimal 97, which corresponds to lowercase a.

Is ASCII to octal conversion exact?

Yes. Each ASCII character has an exact integer code, and converting that integer from decimal to octal requires no rounding or approximation.

Can I convert an entire sentence to octal?

Yes. Each standard ASCII character in the sentence, including spaces and punctuation, is converted into its own octal code.

Does ASCII to octal support emoji?

No. Emoji are Unicode characters outside standard ASCII and require a Unicode-aware encoding method.

Convert ASCII Text to Octal Instantly

Use BinaryCon to convert ASCII characters into octal codes, inspect decimal mappings, verify character values, and use free encoding and number-system tools without registration.