What date is N days from today?

No. Today is day zero and tomorrow is day one, so 30 days from today is the date 30 calendar days after today. Some contracts and forms count the first day as day one, so when a deadline matters, check how the document itself counts.

Yes. The main answer counts calendar days, so Saturdays and Sundays count like any other day. Under the answer, the calculator also shows how many of those days fall Monday to Friday. It does not know your public holidays, so take those off yourself when you need working days.

Not quite. Months run from 28 to 31 days, so 30 days from January 31 lands on March 2, or March 1 in a leap year. If something is due in one month, count to the same date next month instead.

Yours. The page reads today's date from your phone or computer and does the sum there, so the answer matches your own calendar wherever you are.