How do I calculate weeks between two dates?

Enter a start date and end date in the date calculator. It divides the total days by 7 and shows weeks plus remaining days. For example: January 1 to March 15 = 10 weeks and 3 days (73 total days ÷ 7 = 10 remainder 3).

How many weeks are in a year?

52 weeks and 1 day (365 ÷ 7 = 52 remainder 1). A leap year has 52 weeks and 2 days. This is why the same date falls on a different day of the week each year.

How do I count pregnancy weeks?

Pregnancy is measured from the first day of the last menstrual period (LMP). Full term is 40 weeks (280 days). Enter your LMP date as the start date and today as the end date to see how many weeks pregnant you are. Or add 280 days to LMP for the estimated due date.

How many weeks is a school semester?

A typical US college semester is 15-16 weeks. A school year (September to June) is approximately 39-40 weeks. A quarter system runs 10-11 weeks per quarter.

How many work weeks between two dates?

Divide business days by 5. For example: 52 business days ÷ 5 = 10.4 work weeks. The date calculator shows both calendar weeks and business days, so you can derive work weeks from either.

Can I calculate weeks from today?

Yes. Enter today as the start date and your target date as the end date. The calculator shows how many weeks until that date. Or enter a future number of weeks to add and get the resulting date.

Home / Blog / Calculator Tools

How Many Weeks Between Two Dates? (Free Calculator)

Last updated: April 20264 min readCalculator Tools

How many weeks until your due date? How many weeks in a school semester? How many weeks between project start and deadline? Enter two dates and get the exact week count — plus remaining days.

Enter two dates — see weeks, days, months between them instantly.

Open Date Calculator

Common Week Calculations

Period	Weeks	Days	Common Use
1 month	~4.3 weeks	28-31 days	Monthly cycles
1 quarter	13 weeks	91-92 days	Business quarters
1 semester	15-16 weeks	105-112 days	College courses
6 months	~26 weeks	181-184 days	Half-year reviews
9 months	~39 weeks	273-275 days	Pregnancy (approximate)
1 year	52 weeks + 1 day	365 days	Annual planning
Pregnancy full term	40 weeks	280 days	From last menstrual period

How Week Counting Works

The calculator counts every day between your two dates and divides by 7:

73 days ÷ 7 = 10 weeks and 3 days
280 days ÷ 7 = 40 weeks exactly
365 days ÷ 7 = 52 weeks and 1 day

Pregnancy Week Tracker

Pregnancy is tracked in weeks from the first day of the last menstrual period (LMP):

Enter your LMP date as the start date
Enter today as the end date
The weeks shown = how many weeks pregnant you are
Due date = LMP + 280 days (40 weeks)

Project Planning with Weeks

Weeks are the natural unit for sprint planning, project timelines, and academic scheduling:

Agile sprints: Typically 1-2 weeks. Calculate how many sprints fit between start and deadline
Course planning: A 15-week semester starting Sep 1 ends around Dec 15
Event planning: "The conference is 8 weeks away" — exactly what date?

Related Calculators

Date Calculator — days, weeks, months between dates
Age Calculator — exact age from birthday
Countdown Timer — live countdown
Timezone Converter — schedule across zones

How many weeks between any two dates? Instant answer, free.

Open Date Calculator

How Many Weeks Between Two Dates? (Free Calculator)

Common Week Calculations

How Week Counting Works

Pregnancy Week Tracker

Project Planning with Weeks

Related Calculators

Related Posts

Date Calculator

30/60/90 Days From Today

Business Days

How to Calculate Dates