Weeks Between Dates Calculator

Enter two dates to see the gap in full weeks and leftover days. You’ll also get the total days and the number of weeks rounded to two decimal places.

Full weeks
1
Remaining days
1
Total days
8
Decimal weeks
1.14

The selected dates are 1 full week and 1 extra day apart, or 1.14 weeks rounded to two decimal places.

Quick answer

1 November 2026 → 9 November 2026 = 1 week, 1 day

Total elapsed time 8 days · Decimal weeks 1.14

About This Weeks Between Dates Calculator

The calculator finds the elapsed calendar days and divides by seven. It displays the exact gap as full weeks plus leftover days and a rounded decimal for estimates. A 46-day gap is 6 weeks and 4 days, or 6.57 weeks.

The start date is day zero, so Monday to the following Monday is exactly 1 week. Reversing the dates gives the same gap. To count both endpoints as calendar dates, use the inclusive option on Days Between Dates.

How to Calculate Weeks Between Two Dates

Select the start and end dates and choose Calculate. For manual entry, use DD-MM-YYYY. To check the result by hand, count the elapsed days and divide by seven. The quotient gives the full weeks and the remainder gives the extra days.

Worked Example From 9 November to 25 December 2026

StepResult
Count 21 days in November and 25 in December46 days
Split 46 days into groups of 76 weeks, 4 days
Divide 46 by 7 and round to two places6.57 weeks

Examples of Weeks Between Two Dates

FromToDaysWeeks + daysDecimal weeks
Tue, 10 March 2026Tue, 31 March 2026213 weeks3.00
Mon, 9 November 2026Fri, 25 December 2026466 weeks, 4 days6.57
Mon, 9 November 2026Tue, 26 January 20277811 weeks, 1 day11.14
Mon, 1 June 2026Mon, 31 August 20269113 weeks13.00
Mon, 9 November 2026Mon, 15 February 20279814 weeks14.00
Wed, 1 April 2026Wed, 31 March 202736452 weeks52.00
Thu, 1 January 2026Fri, 1 January 202736552 weeks, 1 day52.14
Sat, 1 January 2028Mon, 1 January 202936652 weeks, 2 days52.29

Weeks Between Dates Formula

Weeks = |End date − Start date| ÷ 7

The absolute value gives the size of the gap even if the dates are entered in reverse order. Leap days and different month lengths are included.

  • Full weeks. Take the whole number after dividing the gap by 7.
  • Extra days. Use the remainder. For example, 78 days is 11 weeks and 1 day.
  • Decimal weeks. Divide the day count by 7 and round. For example, 78 days is about 11.14 weeks.
  • Same weekday. If both dates fall on the same weekday, the gap is a whole number of weeks.

Common Uses

  • Courses and exams. See how many full weeks are available for a teaching term or study plan.
  • Fitness plans. Check where a date falls in a programme that runs in weekly blocks.
  • Pregnancy records. Compare two dates in weeks and days. Use the dates established by your care team for clinical tracking. ACOG guidance on due dates.
  • Projects and sprints. Count how many weeks fit before a milestone or launch.
  • Weekly schedules. Check the length of a payroll or rent period measured in weeks.
  • Countdowns. Find how many weeks and extra days remain until a wedding, holiday, or festival.

Frequently Asked Questions

How many weeks are there in a year?

A common year has 365 days, or 52 weeks and 1 day. A leap year has 366 days, or 52 weeks and 2 days.

Does the calculator count partial weeks?

Yes. A 46-day gap is 6 full weeks and 4 days. The decimal result includes those 4 days as a fraction of a week and rounds the total to 6.57 weeks.

Is the end date included?

The calculator measures elapsed days. Monday to the following Monday is 7 days, or 1 week. To count every date from the first Monday through the second, add 1 day to the elapsed total.

What is 12 weeks from a date?

Add 84 days. For example, 12 weeks after Monday 9 November 2026 is Monday 1 February 2027. Use Add Days to Date to apply the 84-day offset.

How many weeks are in a month?

A Gregorian month averages about 4.35 weeks. A 30-day month is 4 weeks and 2 days, a 31-day month is 4 weeks and 3 days, and February in a common year is exactly 4 weeks.

What is a week number?

A week number identifies a calendar week. Under ISO 8601, weeks start on Monday and week 1 contains the year’s first Thursday. Monday 9 November 2026 is in ISO week 46.

Can a year have 53 weeks?

An ISO week-numbering year can have 53 numbered weeks. The final ISO week of 2026 runs from Monday 28 December 2026 to Sunday 3 January 2027.

Calculations use the Gregorian calendar. Week-number examples use ISO 8601 week rules. Last updated .