Enter a character to get its hex, binary, and decimal code; or enter a code to get the character.

Which codes are supported?

Standard ASCII 0–127. Extended codes may vary by encoding.

A → hex 41, binary 1000001, decimal 65.

Online ASCII Hex Binary Decimal Converter

Convert between ASCII characters and their numeric codes in hex, binary, and decimal. Character ↔ code conversion.

Mode

Character (first character used)

What can I convert?: Enter a character to get its hex, binary, and decimal code; or enter a code to get the character.
Which codes are supported?: Standard ASCII 0–127. Extended codes may vary by encoding.
Example?: A → hex 41, binary 1000001, decimal 65.

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Convert numbers to Roman numerals and Roman numerals to numbers. Supports 1–3999.

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Calculate C(n,r) — the number of ways to choose r items from n without order. Uses n!/(r!(n-r)!).

Combinations with Replacement Calculator

Calculate the number of ways to choose r items from n with repetition allowed. Formula: C(n+r-1, r).

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Count how many permutations of n objects are even (expressible as an even number of swaps). For n ≥ 2, equals n!/2.