What is the maximum number supported?

Standard Roman numerals support 1–3999 (MMMCMXCIX).

How do Roman numerals work?

I=1, V=5, X=10, L=50, C=100, D=500, M=1000. Subtract when a smaller numeral precedes a larger one (e.g. IV=4).

Same functionality; this is the calculator slug from the batch list.

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

Number (1–3999)

What is the maximum number supported?: Standard Roman numerals support 1–3999 (MMMCMXCIX).
How do Roman numerals work?: I=1, V=5, X=10, L=50, C=100, D=500, M=1000. Subtract when a smaller numeral precedes a larger one (e.g. IV=4).
Is this different from roman-numeral-converter?: Same functionality; this is the calculator slug from the batch list.

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.