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🗓️ Weeks Between Dates Calculator

Find the exact number of weeks between two dates, including partial weeks. Free online weeks calculator — no sign-up, instant results. Free to use — no sign-up, instant results.

📅 Format: MM/DD/YYYY

06/17/2026
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About This Tool

The Weeks Between Dates Calculator converts any date range into a meaningful weekly count — with the remaining days shown separately. Whether you're tracking a pregnancy (measured in weeks by healthcare professionals), managing agile sprints in software development, calculating the length of a school semester, planning a fitness challenge, or counting down to an anniversary, thinking in weeks is often more intuitive than thinking in raw days.

The calculator returns the complete number of whole weeks and any remaining days. For example, 30 days equals 4 weeks and 2 days — much clearer than just '30 days' when you're planning a weekly schedule. This breakdown is preferred in many professional and personal contexts where recurring weekly events need to be tracked, or where a person wants to understand how many 'rounds' of something will occur in a given timeframe.

Pregnancy tracking is one of the most popular uses: a full-term pregnancy is 40 weeks, and expecting parents can use this calculator to find out exactly how many weeks along a pregnancy is between any two dates. Sprint planning in software teams is another major use case — a 90-day project contains exactly 12 weeks and 6 days, which directly tells you the maximum number of 2-week sprints that fit in the timeline. Whatever your weekly planning need, this calculator provides the answer instantly.

See also:📅 Days Between Dates Calculator📆 Months Between Dates Calculator📊 Years Between Dates Calculator

Examples

30 days
4 weeks + 2 days
Full year (365 days)
52 weeks + 1 day
Pregnancy (280 days)
40 weeks exactly

Frequently Asked Questions

How many weeks are between two dates?+
Select your start and end dates, click Calculate, and you'll see the exact number of complete weeks plus any remaining days. For example, 30 days = 4 weeks and 2 days. The calculation is exact — no rounding, no estimation.
Why use weeks instead of days?+
Weeks are a natural unit of time for planning work schedules (most people think in weeks of work), tracking pregnancies (40 weeks is the standard term), managing project sprints (usually 1–4 weeks each), and scheduling recurring events. Many timelines are communicated in weeks rather than days because they're more intuitive for planning.
Does it count partial weeks?+
The calculator shows complete whole weeks plus the remaining days. It does not round up partial weeks. So 27 days = 3 weeks and 6 days (not 4 weeks). This is deliberate — you need the exact remainder to know what falls in the final partial week.
How many weeks is 9 months of pregnancy?+
A full-term pregnancy is 40 weeks (approximately 280 days) from the first day of the last menstrual period. Nine calendar months is approximately 39–40 weeks, though pregnancy duration is always expressed in weeks, not months, in clinical settings. Use this calculator with your LMP start date and expected due date to get the precise week count.
How many weeks are in a year?+
A standard year has 52 weeks and 1 day (365 days ÷ 7 = 52 remainder 1). A leap year has 52 weeks and 2 days (366 days ÷ 7 = 52 remainder 2). This is why a fixed date in one year falls one day later in the next year — or two days later when a leap year intervenes.
Can I calculate weeks between dates in the past?+
Yes. Enter a past date as the start and a later date (including today) as the end. The calculator works equally well for historical date ranges. This is useful for computing the duration of historical events, elapsed time since a milestone, or the length of a completed project.

Related Tools

📅Days Between Dates Calculator📆Months Between Dates Calculator📊Years Between Dates Calculator📆What Day Was It?