Use 24-hour (e.g. 09:00, 17:30) or 12-hour with AM/PM (e.g. 9:00 AM, 5:30 PM).

Does it handle overnight?

Yes. If out time is earlier than in time, it assumes next day.

This tool only computes total time between in and out. Subtract break time manually if needed.

Online Time Card Calculator

Enter clock in and clock out times to get hours worked.

Clock in

Clock out

What time format?: Use 24-hour (e.g. 09:00, 17:30) or 12-hour with AM/PM (e.g. 9:00 AM, 5:30 PM).
Does it handle overnight?: Yes. If out time is earlier than in time, it assumes next day.
Break time?: This tool only computes total time between in and out. Subtract break time manually if needed.

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.