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Week Calculator

Calculate exact weeks between two dates — find week numbers, count weekdays and weekends, and track gestational age in weeks.

week calculator between two dates

What Is a Week Calculator?

I built this week calculator after realizing that most date tools only give you raw day counts — which don't help when you need to know how many actual weeks, weekdays, and weekends fall between two dates. Whether you're counting down to a project deadline, tracking a pregnancy timeline, or figuring out how many working week calculator days you have before a vacation, having a week counter between dates that breaks everything down saves you from manual arithmetic. The tool takes your start and end dates, then returns the exact weeks and days calculator result along with a full breakdown of weekdays, weekends, and even the week numbers for both dates.

What separates this from a basic date difference is the granularity. A date to week calculator doesn't just subtract one date from another — it tells you that your 34-day span is exactly 4 weeks and 6 days, shows you that there are 24 weekdays and 10 weekend days in that range, and identifies the week number calculator value for each endpoint. For anyone tracking gestational age in weeks, the gestational age calculator weeks output is immediately useful. For project managers, the week number finder feature helps align timelines with calendar weeks. This is a week calculator online that gives you everything in one click, whether you need weeks between dates online free or a detailed week of year calculator breakdown.

  • ✓ Calculate exact weeks between any two dates
  • ✓ Shows weekdays and weekends separately
  • ✓ Week number of any date
  • ✓ Works for any date range
  • ✓ Instant, error-free results

How to Calculate Weeks Between Two Dates

The straightforward way to calculate weeks between two dates is to find the total number of days, then divide by 7. But that only gives you whole weeks — you still need to figure out the remainder, which is where most people stumble. Our weeks calculator handles this automatically: it counts every day between your dates, divides by 7 to get complete weeks, and shows the leftover days separately. If you're wondering how many weeks between two dates that span across months or even years, the tool does the calendar math without you needing to remember which months have 30 versus 31 days.

The real value shows up when you need more than just whole weeks. The week counter also calculates how many weekdays (Monday through Friday) exist in your range, which is essential for working week calculator scenarios like project planning or payroll. If you need to calculate weeks from date for a deadline, knowing you have 3 weeks and 4 days is more actionable than just "25 days." The weeks from date calculator output includes the week number of both the start and end dates using the ISO week number calculator standard, so you can reference exactly which calendar weeks you're working within. Whether you're using it as a week date calculator for scheduling or as a weeks between two dates online tool for personal tracking, the breakdown gives you complete clarity.

how to calculate weeks between two dates
week calculator common uses

Common Uses for Week Calculator

A week calculator shows up in more workflows than you'd expect. In my own work, I use it weekly to figure out sprint lengths and how many weekdays between dates my team actually has to ship features. Project managers live by the week number calculator online because it lets them align deliverables with specific calendar weeks — "due in week 28" is much clearer than a random date. HR departments rely on weekly calculator tools for onboarding timelines, probation periods, and benefits enrollment windows. Even something as simple as counting how many weeks until a holiday becomes a week counter exercise when you need to plan around it.

Beyond professional planning, there are countless personal scenarios where a week calculator online proves genuinely useful. Expectant parents use the pregnancy weeks calculator to track gestational age in weeks and convert that to months using a pregnancy weeks to months calculator approach. The how many weeks pregnant calculator feature helps them understand where they are in the pregnancy timeline. Students use the weeks in a year calculator to plan study schedules across semesters. Anyone trying to how many weeks between dates for travel, fitness challenges, or savings goals benefits from having a week calculator 2026 ready to go. Whether you need to estimate gestational age, count down to an event, or simply week counter between dates for curiosity, this weekly calculator gives you the answer instantly.

Related Calculators

Month Calculator

Months between dates

Days Between Dates

Count days between dates

Year Calculator

Years between dates

Frequently Asked Questions

To calculate weeks between two dates, enter your start date and end date into the calculator, then click Calculate. The tool counts the total number of days, divides by 7 to get complete weeks, and shows any remaining days. For example, if you need to know how many weeks between two dates that span 50 days, the result shows 7 weeks and 1 day. The week calculator also breaks down the range into weekdays and weekends, so you know exactly how many working days exist in that period. You can choose to include or exclude the end date depending on your counting convention, which affects the total.
A week number calculator identifies which week of the year a specific date falls in, using either the ISO 8601 standard or the US system. The ISO week number calculator counts weeks starting from Monday, where week 1 contains the first Thursday of the year. Our week of year calculator shows you the week number for both the start and end dates in your range, which is useful for aligning project timelines with calendar weeks. If you've ever wondered what week number is today, this tool gives you the current week number instantly. The week number finder feature is especially handy for business planning, academic scheduling, and fiscal year tracking.
The weeks between dates feature on this page calculates the exact number of complete weeks and remaining days between any two dates you enter. It's a weeks calculator that goes beyond just dividing days by 7 — it also shows the total month count, weekdays, weekends, and the week number for each endpoint. Whether you need to calculate weeks between two dates for a project timeline, pregnancy tracking, or just personal curiosity, the tool handles any date range. The week counter between dates output gives you all the data in one view, so you can pick the metric that matters most to your situation.
To calculate weeks from a date, you need two points in time: a starting date and an ending date. Our weeks from date calculator takes both dates and computes the difference in weeks, days, and months. If you want to know how many weeks between dates that are several months apart, the tool automatically handles the varying month lengths. The week calculator online also breaks the result into weekdays and weekends, which is essential when you're counting working weeks for a project or event. Simply enter both dates, check whether you want to include the end date, and the week counter gives you the complete breakdown.
A gestational age calculator determines how far along a pregnancy is by counting weeks from the first day of the last menstrual period (LMP). The gestational age in weeks is the standard measurement used by healthcare providers, typically expressed as "X weeks and Y days." Our pregnancy weeks calculator can help you estimate gestational age by entering your LMP date and seeing exactly how many weeks have elapsed. The pregnancy calculator gestational age output also converts weeks to months, which is helpful for understanding the pregnancy weeks to months calculator conversion that many expectant parents look for. For anyone wondering how many weeks pregnant calculator results mean, each week represents a significant milestone in fetal development.
The weekdays between dates count tells you how many Monday-through-Friday days exist in your date range, excluding weekends. This is different from total days — a 14-day range has only 10 weekdays between dates because 4 of those days are weekends. Our week calculator separates weekdays from weekends automatically, giving you both numbers. This is particularly useful for project planning (knowing how many working week calculator days you have), payroll calculations, and scheduling appointments. The week calculator online also shows the weekend count separately, so you have the complete picture of how your date range breaks down across the week.
You can count weeks between dates online free right here — no signup, no downloads, no hidden fees. Simply enter your start date and end date, choose whether to include the end date, and click Calculate. The week calculator online instantly shows the total weeks, remaining days, weekdays, weekends, months, and week numbers for both dates. Whether you need to weeks between dates online free for a project, pregnancy, or personal planning, this tool gives you accurate results in seconds. It's a fully functional week counter that runs entirely in your browser, so there's nothing to install or configure.
To find what week number is today, you can use the week number calculator by entering today's date. The tool uses the ISO week number calculator standard, where weeks start on Monday and week 1 contains the first Thursday of the year. The current week number changes every Monday, so if you check on a Sunday versus a Tuesday, you might get different results. Our week number finder also shows you the week number for any other date you enter, making it easy to compare where two dates fall in the year's calendar structure. The week of year calculator output is useful for fiscal year tracking, project scheduling, and academic planning.
There are 52 complete weeks in a year, plus 1 or 2 extra days (or 2 extra days in a leap year). However, using the ISO standard, some years have 53 weeks depending on where January 1st falls. Our weeks in a year calculator can show you the exact count for any specific year by setting January 1 as the start date and December 31 as the end date. The week calculator 2026 output will show you the precise breakdown including the week number of the last day of the year. This is useful for weekly calculator planning when you need to distribute tasks or goals evenly across all 52 or 53 weeks of a given year.
Yes, you can use this as a pregnancy weeks calculator by entering the first day of your last menstrual period (LMP) as the start date and today's date as the end date. The result tells you exactly how many weeks you've been pregnant, which is how healthcare providers estimate gestational age. For example, if your LMP was 20 weeks ago, you're at 20 weeks gestational age. The gestational age calculator weeks output can also help you understand the pregnancy weeks to months calculator conversion — 20 weeks is roughly 5 months. While this week calculator pregnancy tool gives you the week count, always confirm with your healthcare provider for medical decisions.
To find the week number of a specific date, use the week number calculator by entering that date into the end date field. The week number finder will tell you which week of the year that date falls in, using the ISO week number calculator standard. For example, March 15, 2026 falls in week 11 of the year. The week of year calculator also works in reverse — if you enter a week number and year, you can see the start and end dates of that week. The current week number for today is always available, and the week date calculator feature lets you explore any date's position in the annual calendar.
When you calculate weeks between two dates including weekends, you're counting every day in the range — both weekdays and weekends. Our week calculator shows this as the total day count divided by 7, giving you complete weeks and any remaining days. For example, a 23-day span is 3 weeks and 2 days, regardless of which days of the week those dates fall on. The weeks between two dates online tool also shows you the separate weekday and weekend counts, so you can see exactly how many of those days are working days versus rest days. This comprehensive breakdown makes the week counter between dates useful for both personal and professional planning.