Weeks between dates
Work out how many weeks are between two dates — useful for pregnancy due dates, project timelines or countdowns measured in weeks.
Result
Weeks between
Total days
How to use this calculator
- Enter the start date.
- Enter the end date.
- Read the number of weeks (and total days) between them.
Assumptions
- A straightforward day-count ÷ 7 — doesn't round to whole weeks, so a partial week shows as a decimal.
Technical details: what the fields mean
- Start date
startDate - The earlier date.
- End date
endDate - The later date.
Methodology
Weeks = total days between the dates ÷ 7, shown to one decimal place.
Worked example
1 Jan 2026 to 29 Jan 2026
Inputs: startDate=2026-01-01, endDate=2026-01-29
Result: 4.0 weeks (28 days)
Practical guidance
- For a precise weeks-and-days figure, take the whole-number part as weeks and multiply the decimal by 7 for the remaining days.
Common mistakes
- Rounding the weeks figure without checking the remaining partial week, which matters for time-sensitive planning.
FAQs
How many weeks between two dates?
Enter both dates above — this divides the total day count by 7.