How to add weeks to a date in Excel
Formula (Excel and Google Sheets)
=B2+C2*7Multiply the weeks by 7 and add them: =B2+C2*7.
- Result on the example
- one result per row in
D2, filled down toD6 - Works in
- Every current version
- Google Sheets
- Same formula
See it work
The formula is already in D2, filled down to D6. Change any input and the result updates, or edit the formula to experiment.
How it works
A week is 7 days, so multiplying the weeks by 7 and adding the result moves the date by whole weeks. The follow-up always falls on the same weekday as the visit.
=B2+C2*7Result46078
B21/14/2026The value in B2.
C26The value in C2.
C2*742The * operator multiplies.
B2+C2*746078The + operator adds.
In Google Sheets
The same formula works in Google Sheets: =B2+C2*7. We ran it in Google Sheets mode on the same data and it returns the same results.
Other ways to do it
Each one was run on the same example sheet.
| Formula | Result | When to use it |
|---|---|---|
| =DATE(YEAR(B2),MONTH(B2),DAY(B2)+C2*7) | 2/25/2026, 2/17/2026, 6/12/2026… | The same date built from parts. |
| =WORKDAY(B2+C2*7-1,1) | 2/25/2026, 2/17/2026, 6/12/2026…Different result | Moves a follow-up that would land on a weekend to the Monday after. Every visit here is on a weekday, so nothing moves. Weekend follow-ups move to Monday. |
Common mistakes
- Adding the weeks without multiplying,
=B2+C2, adds days, not weeks. - Format the result as a date; it can show as a serial number.
Try it yourself
Same data, empty answer cell. Your formula is graded instantly, then re-checked on changed data, so a typed-in number won't pass.
Add weeks to a date
D2, add the number of weeks in column C to the visit date, and fill down to D6.Questions
How do I subtract weeks?
=B2-C2*7.
How do I find how many weeks are between two dates?
=INT((end-start)/7) gives the completed weeks.
Checked by running on 2026-10-30: every formula and result on this page was calculated by the Spreadsheet Practice formula engine, in both Excel and Google Sheets modes.