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ASCII value of 'A' and 'a'

ASCII codes for uppercase 'A' (65) and lowercase 'a' (97). Decimal, hex, binary, octal, escape sequences, HTML entities, and how to type each character.

ASCII letters 'A' and 'a' specification

Version 1.0.0 · Last reviewed 2026-07-28

Definition
Uppercase 'A' is ASCII 65 (0x41); lowercase 'a' is 97 (0x61). Letter case differs by a fixed offset of 32 within A–Z / a–z.
What it calculates
Documents ASCII / Unicode encodings for uppercase 'A' (65) and lowercase 'a' (97), and the letter ranges A–Z / a–z.
Inputs
  • Reference lookup for letters 'A' and 'a'
Outputs
  • 'A': decimal 65 · hex 0x41 · binary 01000001
  • 'a': decimal 97 · hex 0x61 · binary 01100001
  • Uppercase block 65–90; lowercase block 97–122 (offset +32)
Formula
code('A')=65; code('a')=97; code(lower)=code(upper)+32

Uppercase A and lowercase a are among the most common ASCII letters. Uppercase letters occupy codes 65–90; lowercase letters occupy 97–122 (offset +32 from uppercase).

ASCII codes for 'A'

Property Value
Character A
Decimal code 65
Hex code 41
Binary code 01000001
Octal code 101
Escape sequence \x41
HTML code A

ASCII codes for 'a'

Property Value
Character a
Decimal code 97
Hex code 61
Binary code 01100001
Octal code 141
Escape sequence \x61
HTML code a

How to type

Method 'A' 'a'
Keyboard Shift + A a (no shift)
Windows Alt code Alt+65 Alt+97
C/C++ escape \x41 or \101 \x61 or \141
HTML entity A a
Unicode U+0041 U+0061

FAQ

What is the ASCII value of capital A?

Decimal 65, hexadecimal 0x41.

What is the ASCII value of lowercase a?

Decimal 97, hexadecimal 0x61.

Why is lowercase a exactly 32 more than uppercase A?

ASCII reserves bit 5 (value 32) as the case bit. Toggling it converts between upper and lower case for letters A–Z.

Are A and a the same in Unicode?

They are different code points: U+0041 (A) and U+0061 (a). Unicode includes ASCII as its first 128 code points.

How do I convert a letter to uppercase in code?

In C: toupper('a') → 'A'. In Python: 'a'.upper() → 'A'.

Assumptions
  • Standard ASCII / Unicode Basic Latin letter ranges.
  • Case conversion uses a fixed +32 offset within A–Z / a–z.
  • Reference page; encodings are fixed by the ASCII standard.
Units
  • Dec / Oct: integer
  • Hex: two hex digits
  • Bin: 8-bit string
Boundary conditions
  • Only A–Z (65–90) and a–z (97–122) follow the +32 case rule.
  • Accented letters are outside basic ASCII.
Example
'A' → 65 / 0x41; 'a' → 97 / 0x61
Validation cases
  • 'A' → 65 / 0x41 / 01000001
  • 'a' → 97 / 0x61 / 01100001
  • 'Z' → 90 / 0x5A
  • 'z' → 122 / 0x7A
Sources
  • ANSI X3.4 / ISO/IEC 646 ASCII
  • Unicode Standard (Basic Latin / Latin-1 Supplement where applicable)
Last reviewed
2026-07-28
Calculation version
1.0.0
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