Other base to decimal?

Choose the source base, enter the number in that base, and get the decimal value.

255 decimal = 11111111 (binary), 377 (octal), FF (hex).

Online Decimal to Other Base Converter

Convert decimal numbers to or from binary, octal, and hexadecimal. Client-side only.

Mode

To base

Decimal number

Decimal to other base?: Enter a decimal number and choose the target base (2, 8, or 16) to get the result.
Other base to decimal?: Choose the source base, enter the number in that base, and get the decimal value.
Example?: 255 decimal = 11111111 (binary), 377 (octal), FF (hex).

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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)!).

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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.