Calculator.net

Choose the subject-specific worksheet for the question, or use the scientific keypad for arithmetic with degree/radian selection. For dates, enter a start and end, decide whether to include the end day, and configure which holidays count. A second route adds or subtracts years, months, weeks or days, including a business-day option. Holiday presets mainly cover the United States, with manual entries for other calendars; workplace observance still needs the appropriate choices. Calculator.net's tools are free without registration. Its tax and other regional models have their own geographic assumptions, so the date settings do not establish worldwide coverage for every calculator.