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Octal to Character Converter

developer · number system

Convert Octal to Character with a fixed input and output format, step-by-step formulas under the result, and reference tables. Parsing matches the main hub (0b, 0x, leading 0 for octal; one optional . for fractional digits on numeric bases; single character for character mode).

Calculator

From: Octal

To: Character

Formulas

Enter a value → place-value expansion + division chain.

About Octal

Octal (base 8) uses digits 0–7. A leading 0 denotes octal in this converter (e.g. 0777). One radix point is allowed; fractional places use 8⁻¹, 8⁻², …. Grouping binary digits in threes maps cleanly to octal, which is why Unix file permissions often use it.

About Character

Character mode treats exactly one character as its Unicode (UTF-16 code unit) scalar value in the range 0–65535. There is no fractional part in this mode. Control and C1 characters are labeled by name in the output when relevant.

How to convert octal to character

Three steps: symbols → the right math move for this pair → worked examples you can copy on paper. Numeric bases (binary, octal, decimal, hex) also support one radix point and digits after it; character mode stays a single code unit.

Step 1 — Identify the symbols

Input (Octal): Each digit is 0–7 (eight possibilities per position).

Output (Character): Exactly one symbol; its numeric code is the value you convert.

Dev note
  • A leading 0 is often used to mark octal (e.g. 012).
  • This tool uses the UTF-16 code unit (0–65535 for BMP).

Step 2 — The Two-Step Method (via Decimal)

First express the left format as a decimal value (one optional . for a fractional part is allowed on numeric bases), then rewrite that value in the right format. The calculator automates both steps.

Part A — Into decimal

Number positions from the right, starting at 0. At each position, multiply that digit by 8 raised to the position index, then add every term. The total is your decimal number.

Digits after the dot: use negative powers of 8 (8−1, 8−2, …). Each place is still (digit × weight); add the fractional side to the whole side.

Part B — Out of decimal

Take the decimal value. If it is in range, the tool maps it to the matching character (or a standard control label).

Step 3 — Worked examples

Two practice values in Octal, converted to Character using the same rules as Step 2.

Example 1

"12" (Octal) → Character.

Toward decimal

Octal "12"
= 1×8¹ + 2×8⁰
= 8 + 2
= 10  (decimal)

From decimal to output

Decimal 10
→ character display: LF

Verify: "12" → LF

Example 2

"377" (Octal) → Character.

Toward decimal

Octal "377"
= 3×8² + 7×8¹ + 7×8⁰
= 192 + 56 + 7
= 255  (decimal)

From decimal to output

Decimal 255
→ character display: ÿ

Verify: "377" → ÿ

Summary

To convert Octal to Character, the tool first parses your input strictly as octal, producing a decimal value. For binary, octal, decimal, and hex, you may include one radix point and fractional digits; character input remains a single code unit with no dot. That value is formatted as character using the same rules as the main Number System Converter (prefixes 0b, 0, 0x where applicable; character output uses symbolic names for common controls and requires a whole-number code point). Long fractional expansions are truncated to a fixed digit cap; ordinary floating-point rounding may appear in extreme cases.

Relationship context

Numeric input is interpreted in octal, converted to an integer, then displayed as the corresponding character (or a standard control-character name when applicable). Values outside 0–65535 are rejected for character output.

Conversion tables

Octal (input)Character (output)
0NUL
01SOH
02STX
03ETX
04EOT
05ENQ
06ACK
07BEL
010BS
011TAB
012LF
017SI
020DLE
Octal (input)Character (output)
013VT
040
0100@
0200PADDING CHARACTER
0400Ā
01000Ȁ
02000Ѐ
04000ࠀ
010000က
020000 
040000䀀
0100000耀
0177777￿

More number system pairs

Other fixed input/output converters use the same parsing rules as the hub. Open any pair for the same calculator layout and reference tables.

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