ASCII 243
Character 243 (ó)
Latin-1 Supplement
Latin small letter ó. Common in Western European languages.
Common uses & context
Decimal 243 (0xF3) is Character 243, part of the Latin-1 Supplement (128–255). Latin small letter ó. Common in Western European languages. It renders as 'ó' and its binary byte is 11110011.
This is where single-byte ASCII ends and encoding matters. In Latin-1 (ISO-8859-1) 'ó' is the single byte 0xF3. In UTF-8 — today's default for the web — the same character is the multi-byte sequence 0xC3 0xB3. Treating a Latin-1 byte as UTF-8 (or vice versa) is the usual reason accented letters and symbols turn into mojibake like é or €. The Unicode code point is U+00F3, and in HTML you can write it as ó.
All encodings at a glance
| Decimal | 243 |
| Hexadecimal | 0xF3 |
| Octal | 0363 |
| Binary | 11110011 |
| HTML numeric entity | ó |
| URL encoding | %F3 |
| UTF-8 bytes | 0xC3 0xB3 |
Code snippets
JavaScript
String.fromCharCode(243); // "ó"
243.toString(16); // "f3"Python
chr(243) # control char ó
ord(chr(243)) # 243
hex(243) # '0xf3'HTML
ó <!-- numeric entity (no named entity for this character) -->Programming notes
- ▸Single byte 0xF3 in Latin-1, but the multi-byte sequence 0xC3 0xB3 in UTF-8 — never assume one byte per character above code 127.
- ▸Unicode code point U+00F3; HTML numeric entity ó.
- ▸If 'ó' shows as mojibake, the encoding declared and the encoding used disagree — align both on UTF-8.
Unicode & UTF-8 note
In Unicode this is U+00F3. In UTF-8 it encodes to the byte sequence 0xC3 0xB3. In legacy Latin-1 (ISO-8859-1) it is a single byte 0xF3, which is why Latin-1 files often appear as mojibake when interpreted as UTF-8.
Frequently asked questions
What character is ASCII code 243?
ASCII code 243 is the character 'ó' (Character 243). In hexadecimal it is 0xF3, in octal 0363, and in binary 11110011.
What is 0xF3 in ASCII?
Hexadecimal 0xF3 equals decimal 243, which is the character 'ó' (Character 243). To convert hex to ASCII yourself, read the two hex digits as a base-16 number (0xF3 = 243) and look up that code point.
How do I write the character with code 243 in code?
In JavaScript use String.fromCharCode(243); in Python use chr(243); in HTML use the numeric entity ó. In a URL it is percent-encoded as %F3, and in UTF-8 it is stored as the byte sequence 0xC3 0xB3.
Is 'ó' part of standard ASCII?
No. Standard ASCII covers codes 0–127 only. 'ó' is code 243, part of the Latin-1 Supplement (128–255, sometimes called "extended ASCII"). It is a single byte 0xF3 in Latin-1 but a multi-byte sequence (0xC3 0xB3) in UTF-8.