Enter hours and minutes in separate fields. Result is shown as hours and minutes.

Can result exceed 24 hours?

Yes. The tool shows total hours and minutes (e.g. 25h 15m).

What about subtraction?

Choose subtract; if the result would be negative, it is shown as zero or an error depending on implementation.

Add or subtract hours and minutes (e.g. 2h 30m + 1h 45m).

How do I enter time?: Enter hours and minutes in separate fields. Result is shown as hours and minutes.
Can result exceed 24 hours?: Yes. The tool shows total hours and minutes (e.g. 25h 15m).
What about subtraction?: Choose subtract; if the result would be negative, it is shown as zero or an error depending on implementation.

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

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

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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.