ASCII Table Reference

How this calculation works

Enter one character, a decimal code (65), or a hex code (0x41), and the tool resolves it to a single ASCII code point, then shows that code in decimal, hexadecimal, octal and binary at once, along with its name if it is a control character. Because ASCII is only 7 bits, every value fits in the range 0–127; anything you type that lands outside it is Unicode rather than ASCII.

What the results mean

Control characters

Codes 0–31 and 127 have no printable glyph — they signal formatting like tab (9), newline (10) and carriage return (13), or once-hardware signals like null (0) and escape (27).

Printable range

Codes 32–126 are the visible characters: space (32), then digits, punctuation, and the upper- and lower-case letters. 'A' is 65, 'a' is 97 — exactly 32 apart, which is how case conversion flips a single bit.

The four bases

The same code shown as decimal, hex, octal and binary. Hex (0x41) appears in string escapes and colour codes; octal (\101) turns up in older tools and file permissions; binary shows the 7 bits directly.

Common problems and fixes

My character shows nothing, or says it is out of range

It is beyond code 127 — an accented letter, a curly quote, an emoji or a symbol. Those are Unicode, not ASCII, and have no 7-bit code. A Unicode or code-point lookup tool will resolve them; this table deliberately stops at 127 so it never reports a false ASCII value.

I can't tell which code a space or a tab is

Space is 32 (the first printable code). Tab is 9, newline (line feed) is 10, and carriage return is 13 — all control codes, so they show a name rather than a visible glyph.

Frequently asked questions

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• Number Base ConverterConvert a number between binary, octal, decimal and hex — exactly, at any size.