Use this free weeks calculator to find the date a number of weeks from today or from any date, such as 12 weeks from today or 6 weeks ago, to count the weeks between two dates or until Christmas, and to turn weeks into days, hours and months. Tables show the dates 1 to 52 weeks from today and ago, the weeks until Thanksgiving, Halloween and other holidays, how many days weeks are, and how many weeks are in a month. It is free and instant, and your dates stay in your browser.
How to add weeks to a date
Choose the start date, which is today to begin with, type the number of weeks and press Find the Date. Choose After to look ahead, for example what is 12 weeks from today, or Before to look back, for example what was 6 weeks ago. You can add extra days too. A week is 7 days, so the answer is the start date plus the weeks times 7 days.
Monday 25 January 202712 weeks is 84 days. Counting 84 days forward from 2 November 2026 lands on 25 January 2027, which is also a Monday.
Why the weekday stays the same
Because every week has exactly 7 days, moving a whole number of weeks forward or back always lands on the same weekday. If today is a Wednesday, 2 weeks from today, 10 weeks from today and 52 weeks from today are all Wednesdays. When you add extra days, the weekday moves on by that many days.
How to count the weeks between two dates
Open the Weeks Between Dates tab and pick the two dates. The calculator counts the days between them, divides by 7, and shows the whole weeks and the days left over, as well as the total days, the decimal weeks, the months and days, and the weekdays from Monday to Friday. The start day is not counted unless you tick Count the start day too. If the second date is earlier than the first, the two dates are swapped and a note tells you.
38 weeks 6 daysThere are 272 days between the two dates. 272 ÷ 7 is 38 whole weeks with 6 days left over.
How many weeks until Christmas, Thanksgiving or Halloween
The shortcuts in the Weeks Between Dates tab, and the How Many Weeks Until table, count from today to the next time each holiday comes round. Christmas is 25 December, Halloween is 31 October, Thanksgiving is the 4th Thursday of November, Labor Day is the first Monday of September and Memorial Day is the last Monday of May.
How many days is 6 weeks, and how many weeks are in a month?
6 weeks is 42 days, which is 1,008 hours. The How Many Days Is 6 Weeks table lists 1 to 52 weeks in days, hours and months. A month is not a whole number of weeks, because months have 28 to 31 days. On average a month is about 4.35 weeks, so 3 months is about 13 weeks and 6 months is about 26 weeks. A year is 52 weeks and 1 or 2 days, which is 52.18 weeks.
Adding weeks in Excel and Google Sheets
In a spreadsheet, a date is a number of days, so add weeks by multiplying them by 7. If the start date is in cell A1, =A1+12*7 is the date 12 weeks later, and =A1-6*7 is the date 6 weeks earlier. Format the cell as a date.
Calculators that go with this one
To add months and years as well as weeks, use the Date Calculator. To count only days, use the Day Counter, and to skip weekends and holidays use the Business Days Calculator. For the week number of a date, the weeks left in the year and how many weeks are in a year, use the Week Number Calculator. For a pregnancy due date, use the Due Date Calculator.
