How many weeks until…
Weeks from today, October 19, 2026:
| Until | Date | Weeks | Weeks and days |
|---|---|---|---|
| the end of this year | Dec 31, 2026 | 10.43 | 10 weeks 3 days |
| New Year’s Day | Jan 1, 2027 | 10.57 | 10 weeks 4 days |
| the same date next year | Oct 19, 2027 | 52.14 | 52 weeks 1 day |
| 6 months from today | Apr 19, 2027 | 26.00 | 26 weeks |
How to count the weeks between two dates
- Count the days between the dates (the start date is not counted, the end date is).
- Divide by 7. The whole number is the full weeks; the remainder is the extra days.
- For a decimal, keep the division as it is: 100 days ÷ 7 = 14.29 weeks.
\text{weeks} = \frac{\text{days}}{7}, \qquad \text{full weeks} = \left\lfloor \frac{\text{days}}{7} \right\rfloor89 days ÷ 7 = 12.71, which is 12 weeks 5 days.
Weeks in common periods
| Period | Days | Weeks |
|---|---|---|
| A month (average) | 30.44 | 4.35 |
| A quarter (3 months) | 91.31 | 13.04 |
| A common year | 365 | 52.14 |
| A leap year | 366 | 52.29 |
| A full-term pregnancy | 280 | 40 |
A year is 52 weeks and 1 day (2 in a leap year), which is why your birthday moves one weekday later each year. Calendar weeks in a year – 52 or 53 – are a different count; see the Week Number Calculator.
Weeks between dates in Excel or Google Sheets
| You want | Formula (dates in A2 and B2) |
|---|---|
| Decimal weeks | =(B2-A2)/7 |
| Full weeks | =INT((B2-A2)/7) |
| Leftover days | =MOD(B2-A2,7) |
Frequently asked questions
How many weeks are in a year?
52 weeks and 1 day, or 52 weeks and 2 days in a leap year – 52.14 or 52.29 weeks.
How many weeks are in a month?
About 4.35 weeks on average. February has exactly 4 weeks in a common year; 31-day months have 4 weeks and 3 days.
Is the end date counted?
Not by default. Choose “Yes” under Include End Date to add one day, for example when both the first and last days are part of a booking.
How do I convert days to weeks?
Divide by 7: 45 days = 6 weeks and 3 days, or 6.43 weeks. For the day count between dates, use Days Between Dates.
How many weeks pregnant am I?
Pregnancy is counted from the first day of the last menstrual period, so enter that date as the start date and today as the end date. A full-term pregnancy is about 40 weeks. Your doctor or midwife can confirm the dates.