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Accurate time conversion tool for weeks and days
Convert weeks to days instantly with precise results. Includes days to weeks mode, weeks & days input, and a full time unit breakdown covering hours, minutes, seconds, months, and years — updated for 2026.
Professional time conversion for project planning, scheduling, medical timelines, and everyday use
Convert weeks to days using the exact factor of 7 days per week — a universally defined, internationally fixed relationship. Our converter handles any input from fractions of a week to thousands of weeks, delivering precise results with full decimal precision for project timelines, pregnancy tracking, academic calendars, and any other time-based calculation.
Switch freely between weeks to days, days to weeks, and the combined weeks & days to total days mode. The third mode is ideal for mixed inputs like "3 weeks and 4 days" — enter both values and get the total days, hours, minutes, and seconds all at once. Results update instantly with no page reload required.
Every conversion result includes a full eight-unit time breakdown — days, weeks, hours, minutes, seconds, months (average), and years — calculated simultaneously from a single input. This makes the converter especially useful for pregnancy gestational age calculations, project duration planning, age calculations, and deadline scheduling in any context.
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The week is a unit of time equal to exactly 7 days. It is one of the most universally recognised time units, used in virtually every culture and calendar system worldwide — from the Gregorian calendar used internationally to the Islamic, Hebrew, and Chinese calendar systems, all of which group days into 7-day cycles. The day is defined in the SI system as exactly 86,400 seconds and is the fundamental unit from which all other civil time divisions — hours, minutes, and weeks — are derived.
The relationship between weeks and days is one of the simplest and most exact conversions in any unit system: 1 week = 7 days, with no rounding, approximation, or leap-year complications involved. This means that converting between weeks and days always produces a precise, whole or decimal result — making it ideal for planning tools, scheduling applications, medical gestational age calculations, pregnancy trackers, and any context where exact day counts matter.
1 week = 7 days = 168 hours = 10,080 minutes = 604,800 seconds
Use this quick-reference table to find common weeks to days conversions instantly. All values use the exact factor of 1 week = 7 days.
| Weeks (wk) | Days (d) | Hours (h) | Minutes | Common Reference |
|---|---|---|---|---|
| 1 week | 7 days | 168 h | 10,080 min | 1 calendar week |
| 2 weeks | 14 days | 336 h | 20,160 min | 1 fortnight |
| 4 weeks | 28 days | 672 h | 40,320 min | ~1 month |
| 6 weeks | 42 days | 1,008 h | 60,480 min | Standard notice period |
| 8 weeks | 56 days | 1,344 h | 80,640 min | 2-month period |
| 10 weeks | 70 days | 1,680 h | 100,800 min | Quarter of year (approx.) |
| 12 weeks | 84 days | 2,016 h | 120,960 min | 1st trimester pregnancy |
| 13 weeks | 91 days | 2,184 h | 131,040 min | 1 calendar quarter |
| 26 weeks | 182 days | 4,368 h | 262,080 min | Half a year |
| 40 weeks | 280 days | 6,720 h | 403,200 min | Full-term pregnancy |
| 52 weeks | 364 days | 8,736 h | 524,160 min | 1 calendar year (approx.) |
| 104 weeks | 728 days | 17,472 h | 1,048,320 min | 2 years |
Converting weeks to days is one of the simplest unit conversions — it requires a single multiplication by 7. For mixed values (weeks and additional days), an extra addition step is needed.
A common mistake is assuming that 4 weeks equals exactly 1 calendar month. In reality, 4 weeks = 28 days, but calendar months have 28, 29, 30, or 31 days depending on the month and leap year. The average calendar month is approximately 30.4375 days (365.25 ÷ 12), not 28. For precise planning involving months and years, always convert to days first — never equate weeks directly to months without accounting for the specific months involved.
The weeks to days converter is one of the most frequently needed time conversion tools for project managers, healthcare professionals, students, and anyone planning across medium-length timeframes where both weeks and days need to be compared or tracked simultaneously.
Gestational age during pregnancy is measured in weeks, but medical appointments, milestone tracking, and due date calculations often need exact day counts. The weeks to days converter is an essential tool for midwives, obstetricians, and expecting parents needing to convert gestational weeks (e.g., 40 weeks = 280 days) to exact day counts for clinical records and planning.
Project managers use Gantt charts, sprint timelines, and milestone schedules in both weeks and days depending on the planning tool and team preference. Converting between weeks and days ensures task durations, deadlines, and delivery windows are consistently expressed across project documentation, stakeholder reports, and scheduling software.
University semesters, school terms, and holiday periods are typically described in weeks, while attendance records, assignment deadlines, and examination timetables use specific day counts. Students and administrators converting semester lengths (e.g., 13 weeks = 91 days) to exact days can accurately plan study schedules and coursework submission timelines.
Employment contracts, notice periods, parental leave, and probationary periods are often stated in weeks in many countries' labour laws. HR professionals and employees routinely convert these week-based entitlements to exact days to calculate precise start and end dates for payroll, leave management systems, and legal compliance documentation.
Training programmes for marathon running, weightlifting, and endurance sports are structured in weekly cycles but tracked day-by-day. Converting a 16-week or 20-week training plan to days helps athletes schedule rest days, peak training periods, taper phases, and race-day timing with the exact granularity needed for peak performance planning.
Financial instruments, loan terms, bond durations, and investment horizons are sometimes quoted in weeks but must be converted to exact days for interest accrual calculations, settlement date determination, and regulatory reporting. Converting week-based financial periods to days ensures accurate day-count calculations under actual/actual or 30/360 day-count conventions.
Some week counts carry special significance across medicine, science, and everyday life. These landmark conversions are worth memorising for quick mental calculations.
One important nuance: 52 weeks = 364 days, which is one day short of a standard 365-day year. This is why the calendar advances by one weekday each year (two in a leap year) — the extra day(s) beyond 52 complete weeks shifts the start day forward. For exact year-to-week conversions, use 365.25 days per average year, giving 52.1786 weeks per year.
Need to go deeper into time unit conversions? Our days to minutes converter instantly calculates hours, minutes, seconds, and more from any number of days. Perfect for project management, event planning, and scientific time calculations where granular sub-day precision is needed.
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