How adding weeks works
A week is always exactly 7 days, so adding weeks is simple: multiply by 7 and add the days. The result always falls on the same day of the week as the start date — 12 weeks from a Tuesday is a Tuesday.
Result date = start date ± (weeks × 7 days)
Weeks from today
Common uses
- Pregnancy: pregnancy is measured in weeks — 40 weeks from the first day of the last period is the estimated due date. The Due Date Calculator does this for you.
- Notice periods and probation: 4, 6 or 12 weeks from a start date.
- Healing and recovery times, training plans and courses.
- Sprints and project schedules planned in 2-week blocks.
For months, use Add Months to Date; for days, Add Days to Date.