Weeks Between Dates
Calculate the exact number of weeks (and remaining days) between any two dates.
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How to use this calculator
- 1
Select the start date.
- 2
Select the end date.
- 3
The result shows the exact number of complete weeks and remaining days between the two dates.
Frequently asked questions
What exactly does the tool calculate?
It finds the number of whole days between the two dates and divides by 7. The headline shows the exact value to four decimals, and a second line splits it into whole weeks and leftover days. January 31 to March 1, 2026 is 29 days, shown as 4.1429 weeks and 4 weeks 1 days.
Are the start and end dates both counted?
No, it measures the distance between them. January 5 to April 13, 2026 is 98 days, which is exactly 14 weeks. If you need both end dates included, add one day to the total before converting to weeks.
What does it show when the end is before the start?
The result is the same size with a minus sign. March 2 back to February 16, 2026 shows −2.0000 weeks, −2 weeks 0 days and −14 days.
Why does a year not come out at exactly 52 weeks?
Because 52 weeks is 364 days. January 1 to December 31, 2026 is 364 days, so it shows exactly 52 weeks, but the same dates in leap year 2024 give 365 days, 52.1429 weeks and 52 weeks 1 days. A full 365-day year always leaves a remainder day.
How are leap days handled?
They are included in the day count like any other day, since the tool works from actual calendar dates. February 29, 2024 to February 28, 2025 is 365 days, and February 29, 2024 to February 29, 2028 is 1,461 days, shown as 208 weeks 5 days.
Does it use week numbers or specific weekdays?
No. It does not use ISO week numbers or start weeks on any particular day. It divides the span into blocks of 7 days from the start date, so a pair of dates that begin on a Wednesday will count Wednesday to Wednesday as a week.
How many weeks is 90 days?
90 days is 12 weeks and 6 days, or 12.8571 weeks. For example, December 15, 2025 to March 15, 2026 is exactly that.
Does it handle times or time zones?
No, only calendar dates. Each date is taken as local midnight, the elapsed time is rounded to whole days, and blank or invalid dates produce a dash instead of a result.
Weeks between dates — exact weeks and leftover days
Weeks are the easy unit
Unlike months, a week never changes length, so the calculation is a plain division of the day count by seven. That makes it the cleanest way to describe medium spans such as a project phase, a course, a notice period quoted in weeks. The tool shows the answer two ways: as a decimal with four places for sums, and as whole weeks plus days for reading aloud. The days remainder is always between 0 and 6 because anything larger would form another week.
Worked examples
Six fixed date pairs were run through the calculator. The table lists the total days, the exact weeks and the weeks-plus-days split, and includes an exact multiple of seven, a leap-year span, and a reversed pair.
| Start | End | Total days | Exact weeks | Weeks + days |
|---|---|---|---|---|
| 2026-01-05 | 2026-04-13 | 98 | 14.0000 | 14 weeks 0 days |
| 2026-01-31 | 2026-03-01 | 29 | 4.1429 | 4 weeks 1 days |
| 2025-12-15 | 2026-03-15 | 90 | 12.8571 | 12 weeks 6 days |
| 2026-01-01 | 2026-12-31 | 364 | 52.0000 | 52 weeks 0 days |
| 2024-01-01 | 2024-12-31 | 365 | 52.1429 | 52 weeks 1 days |
| 2026-03-02 | 2026-02-16 | −14 | −2.0000 | −2 weeks 0 days |
Reading the fraction
The decimal part is the remainder in sevenths. 0.1429 is one seventh, so one extra day; 0.8571 is six sevenths, so six extra days. That is why 90 days shows 12.8571 weeks and the split line reads 12 weeks 6 days. When you need to carry the number into a spreadsheet, the four-decimal figure is more convenient. When you want to say it aloud, the weeks-plus-days line is clearer. Both come from the same day count, so they never disagree.
Leap years and long spans
The tool works from calendar dates, so leap days are counted automatically. Over four years from February 29, 2024 to February 29, 2028 the span is 1,461 days, equal to 208 weeks and 5 days. Spans that include February 29 are one day longer than the same dates in a common year, which can nudge a result across a week boundary. Check the day total when your answer is close to a whole number of weeks.
Limits worth knowing
The calculator measures from the start date as day zero, so it does not include both end dates. It ignores the day of the week, week numbering schemes, public holidays and times of day. For weekdays only, use the working days calculator; for months or years, use the matching calendar-based pages, since months and years do not divide into weeks evenly.
Learn more from an authoritative source:
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →