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Weeks Between Dates Calculator

Calculate how many weeks, days, and decimal weeks fall between any two dates. Useful for project timelines, school terms, milestone tracking, and personal deadlines.

How do you calculate weeks between two dates?

To calculate weeks between dates, count the total days between the start and end date, then divide by 7. Calcadian also shows the remaining days after full weeks, plus the duration as a decimal number of weeks.

Highlight as

Result

Weeks & days
0 weeks, 0 days
Total days
0
Decimal weeks
0.00
Start day of week
Thursday
End day of week
Thursday

From Thursday, June 25, 2026 to Thursday, June 25, 2026, there are 0 days, which equals 0 weeks and 0 days (0.00 weeks).

How to use

  1. Enter the start date.
  2. Enter the end date.
  3. Choose whether to include the end date.
  4. Click Calculate.
  5. Review total weeks, remaining days, and total days in the result card.

Examples

  • 28 days equals exactly 4 weeks — no remainder.
  • 31 days equals 4 weeks and 3 days, or 4.43 weeks.
  • 90 days equals 12 weeks and 6 days, or 12.86 weeks.

When to use this calculator

Weeks-between math comes up more often than you'd think. Use this tool to plan project sprints and delivery windows, to count school terms or course lengths, to track milestone or pregnancy timelines for general informational purposes, to plan travel itineraries, to size out work schedules and shift rotations, and to keep personal deadlines on track. For anything regulated — payroll, statutory leave, medical dating — verify with the relevant authority.

Related tools

Date Difference CalculatorCount days, weeks, months, and years between two dates.Open Week Number CalculatorFind the ISO week number for any date.Open Add or Subtract Days CalculatorFind a future or past date by adding or subtracting time.Open Days Until CalculatorCount how many days are left until any future date.Open Business Days CalculatorCount working days between two dates, excluding weekends.Open

Frequently asked questions

How do I calculate weeks between two dates?
Count the total number of days between the start and end date, then divide by 7. The whole-number part is the number of complete weeks; the remainder is the leftover days. Calcadian does both and also shows decimal weeks rounded to two places.
Does the calculator include the end date?
By default, no — it counts the gap between the two dates, so January 1 to January 8 is exactly 1 week (7 days). Turn on “Include end date” to count both endpoints, which adds one extra day to the total.
How many days are in a week?
Seven. Weeks are uniform across the calendar regardless of month length, leap years, or time zones, which is what makes week-based planning so useful.
What is the difference between total weeks and weeks plus days?
Total weeks (decimal) divides the total days by 7 and keeps the fraction — for example 31 days is 4.43 weeks. Weeks plus days splits that into 4 whole weeks and 3 leftover days. Same duration, two ways of reading it.
Can I calculate business weeks instead?
Not directly — this tool counts calendar weeks. To work in business days only, use the Business Days Calculator, which excludes weekends and any custom holidays you specify.

Calcadian calculators are for general planning and informational use. Please verify critical deadlines, legal, payroll, tax, HR, or official requirements with the relevant authorities or a qualified professional.