Decimal values 0–255 map to ASCII and extended ASCII characters. Values outside this range are invalid.

What about control characters?

Values 0–31 and 127 are non-printable control characters; the tool still shows the mapping.

Online Decimal to ASCII Converter

Convert a decimal number (0–255) to its ASCII character.

Decimal (0–255)

What range is valid?: Decimal values 0–255 map to ASCII and extended ASCII characters. Values outside this range are invalid.
What about control characters?: Values 0–31 and 127 are non-printable control characters; the tool still shows the mapping.

Celsius to Fahrenheit Converter

Convert Celsius to Fahrenheit and Fahrenheit to Celsius instantly. Free temperature converter.

Tip Calculator

Calculate tip and split the bill. Enter bill amount, tip percentage, and number of people.

Roman Numeral Converter

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

Combinations Calculator

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).

Even Permutations Calculator

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