How to use the add or subtract days calculator
This calculator adds or subtracts a number of days from a given date and shows the resulting date. Enter the start date, enter how many days to add or subtract, choose "Add" or "Subtract," and click "Calculate" to see the result. The result is shown in full format (weekday, month, day, year) and in short form. Use it to find a date that is so many days in the future or in the past from today or from any other date.
Adding or subtracting days from a date is useful for many tasks. You might need to know when a deadline falls (e.g., 14 days from today), when a subscription or trial ends, or what date it will be after a certain number of working or calendar days. Project planners use it for milestones; travelers for return dates; and anyone for follow-ups, payment terms, or countdowns. The calculator uses the calendar correctly, so month lengths and leap years are handled automatically. You can enter large numbers of days (e.g., 365 or 1000) to jump far into the future or past.
The calculator runs entirely in your browser. There is no sign-up, no download, and no delay. It is designed to be mobile-friendly: the two-column layout stacks on small screens, inputs are easy to use on touch devices, and the result appears next to your inputs. Use it for quick checks or for planning— whether you need a date a few days away or many months away.
Bookmark this page for quick access whenever you need to add or subtract days from a date. This free add or subtract days calculator provides fast, clear results on any device.