Weeks to Days Calculator — Fast, Free, and Exact
Turn any number of weeks into days in seconds with our free online calculator. Ideal for FMLA leave planning, project timelines, marathon training, and pregnancy countdowns. Instant, accurate results every time.
US Time Zone & Duration ConverterThe quick answer for 1 Weeks — type any value below for the exact result
Weeks
Days
Weeks to Days Conversion Formula
To convert weeks to days, multiply the week value by 7. This is an exact conversion based on the standard definition: 1 week = 7 days = 168 hours.
Weeks and Days Explained
Weeks (week)
A week (wk) is 7 days, or 168 hours — the rhythm unit of American work and life. Project roadmaps, agile sprints, training blocks, and leave policies are all scoped in weeks because the 7-day cycle lines up with weekends and weekly routines. Converting weeks to days multiplies by 7 exactly, giving 42 days for a 6-week build or 280 days for a 40-week pregnancy with zero month-length guesswork.
Where it is used: Weeks are the planning unit for software sprints, construction schedules, college semesters, fitness programs, and notice periods across the United States.
Origin: The 7-day week spread from ancient Babylonian astronomy (the seven visible wandering lights) through Jewish and Christian tradition into the Roman calendar; ISO 8601 later standardized it for international business, including US corporate planning.
Days (d)
A day (d) is exactly 86,400 seconds, or one twenty-fourth of a week's 168 hours. Days are the unit American deadlines, permits, prescriptions, and legal clauses count in, so week-based plans need to become day counts before they hit paper. One week is 7 days, so 8 weeks of lease notice is a 56-day clock and a 12-week program is 84 calendar days — conversions that stay exact because the week never changes.
Where it is used: Days are the counting unit for statutory deadlines, medical treatments, PTO balances, and any duration that has to land on a specific calendar date.
Origin: The day is the oldest time standard, tied to Earth's rotation; the SI definition fixes it at exactly 86,400 seconds, which keeps week-to-day math a clean ×7.
Weeks to Days Conversion Table
| Weeks (week) | Days (d) |
|---|---|
| 0.5 week | 3.5 d |
| 1 week | 7 d |
| 1.5 week | 10.5 d |
| 2 week | 14 d |
| 2.5 week | 17.5 d |
| 3 week | 21 d |
| 4 week | 28 d |
| 5 week | 35 d |
| 6 week | 42 d |
| 8 week | 56 d |
| 10 week | 70 d |
| 12 week | 84 d |
| 16 week | 112 d |
| 20 week | 140 d |
| 26 week | 182 d |
| 36 week | 252 d |
| 52 week | 364 d |
Days to Weeks Conversion Table
| Days (d) | Weeks (week) |
|---|---|
| 1 d | 0.1428571429 week |
| 2 d | 0.2857142857 week |
| 3 d | 0.4285714286 week |
| 5 d | 0.7142857143 week |
| 7 d | 1 week |
| 10 d | 1.4285714286 week |
| 14 d | 2 week |
| 21 d | 3 week |
| 28 d | 4 week |
| 30 d | 4.2857142857 week |
| 60 d | 8.5714285714 week |
| 90 d | 12.8571428571 week |
| 100 d | 14.2857142857 week |
| 365 d | 52.1428571429 week |
Weeks to Days in Everyday Objects
Common real-world examples that make Weeks and Days easy to picture at a glance.
| Weeks (week) | Days (d) | |
|---|---|---|
| A two-week Scrum sprint | 2 week | 14 d |
| A typical antibiotics prescription | 1 week | 7 d |
| A rental lease notice period | 4 week | 28 d |
| A 16-week marathon training plan (Boston, NYC, Chicago) | 16 week | 112 d |
| A US college semester | 15 week | 105 d |
| A new hire onboarding period | 12 week | 84 d |
When You Need Weeks to Days Conversions
Construction and Remodel Scheduling
A contractor bidding a 6-week kitchen remodel in Chicago is committing to 42 calendar days — the number the building permit, penalty clause, and liquidated-damages schedule actually enforce.
Sprint and Release Planning
A two-week Scrum sprint is exactly 14 days, so a 10-sprint roadmap is a 140-day delivery window — the number product managers at US tech companies pin on the release calendar.
Marathon Training Blocks
Novice plans run 16 weeks = 112 days, with long-run mileage mapped against that day count; an injury in week 9 still leaves 49 days to adjust before race day.
Clinical Treatment Courses
A 12-week physical therapy protocol equals 84 days of sessions, which must fit inside a US insurance authorization window that counts calendar days, not visits attended.
Related Time Conversions
How to Use
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1
Enter Weeks
Type the number of weeks you want to convert — common entries include sprint cycles (1-4 weeks), coding bootcamps (12 weeks), FMLA leave (up to 12 weeks), and lease notice windows (2-12 weeks)
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2
View Days
Your answer appears instantly. For example, 16 weeks of marathon training converts to 112 days
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3
Copy or Swap
Copy the result, or hit Swap to convert days back into weeks
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4
Use the Table
Browse the table for go-to planning numbers — perfect for permit deadlines, HR timelines, and school calendars
Why Use Be Converter?
Instant Conversion
Get precise week to day results in real time as you type — decimals work too, like 2.5 weeks = 17.5 days
Exact Conversion
Built on the universal 7-day week — no estimating month lengths, no rounding errors, ever
Conversion Table
Handy reference covering everyday values like 2 weeks (14 days), 6 weeks (42 days), 12 weeks (84 days), and 40 weeks (280 days)
Bidirectional
One click flips the tool to convert days back into weeks for reverse conversions
Free & No Signup
No account, no limits, no catch — use it as often as you like, completely free forever
Privacy First
Everything runs right in your browser — nothing you type ever leaves your device
Frequently Asked Questions
How many days are in 1 week?
How do I convert weeks to days?
How many days is 8 weeks?
How many days is 12 weeks?
Do all countries use a 7-day week?
How many days is 16 weeks?
How many days is 40 weeks?
How many days is 26 weeks?
About Weeks to Days Converter
Our free online weeks to days calculator turns week-based plans into the calendar-day counts that deadlines, permits, and paperwork actually run on. Whether you're confirming that a 6-week kitchen remodel means 42 days, that 12 weeks of FMLA leave covers 84 days, or that a 40-week pregnancy is a 280-day countdown, this tool delivers exact answers instantly. The math is a simple multiplication by 7 — no month-length guesswork — and the calculator handles whole and decimal weeks alike, with a swap button for the reverse conversion.
Expert Tips for Weeks to Days Conversion
Contracts count calendar days, crews talk in weeks: a "6-week remodel" becomes a 42-day commitment the moment the building permit is issued — convert before you sign
Sprint math for agile teams: one 2-week sprint = 14 days, so a 10-sprint roadmap is a 140-day release window you can drop straight onto the product calendar
Training plans are written in weeks but executed in days: a 16-week marathon plan is 112 daily workouts — skipping 2 weeks leaves 98 days, not "plenty of time"
Insurance approvals tick down in days: a 12-week physical therapy plan has to fit inside an 84-day authorization window, cancellations included
26 weeks = 182 days — the standard maximum unemployment benefits duration in most states; short-term disability forms usually ask for the day count, not the week count