What format should I enter?

For 12h: e.g. 2:30 PM or 2:30 pm. For 24h: e.g. 14:30. The tool detects and converts to the other format.

00:00 in 24-hour time is midnight (12:00 AM). 24:00 is sometimes used for end of day but we treat it as midnight.

Online Military Time Converter

Convert between 12-hour time (AM/PM) and 24-hour military time. Enter a time and get the equivalent in the other format.

Time (12h e.g. 2:30 PM, or 24h e.g. 14:30)

What format should I enter?: For 12h: e.g. 2:30 PM or 2:30 pm. For 24h: e.g. 14:30. The tool detects and converts to the other format.
What is 00:00?: 00:00 in 24-hour time is midnight (12:00 AM). 24:00 is sometimes used for end of day but we treat it as midnight.

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.