Weeks to days
This converter turns any number of weeks into days, and back again, using the exact and unchanging rule that 1 week = 7 days. It is useful for planning notice periods, sprint lengths, pregnancy milestones, or any schedule quoted in weeks that you need to express in days.
How it works
Converting weeks to days simply multiplies by 7:
days = weeks × 7
Press Swap and the tool divides instead, turning days back into weeks (including fractional results):
weeks = days ÷ 7
Because a week is always exactly seven days, the conversion is precise with no rounding or calendar quirks. Type a value and the result updates instantly.
Reference table
| Weeks | Days | Common context |
|---|---|---|
| 1 | 7 | One working week plus weekend |
| 2 | 14 | Standard notice period, short sprint |
| 4 | 28 | Roughly one month |
| 6 | 42 | Common physiotherapy recovery window |
| 8 | 56 | UK statutory notice period for long-term employees |
| 12 | 84 | One quarter |
| 13 | 91 | One calendar quarter exactly |
| 40 | 280 | Full-term pregnancy |
| 52 | 364 | One year (364, not 365 — one day short) |
Practical examples
Sprint planning: An Agile team runs two-week sprints. A 12-week project fits exactly 6 sprints (12 × 7 = 84 days, 6 × 14 = 84 days). That 84-day figure is useful when negotiating a fixed-price contract deadline.
Medical context: A GP prescribes a 6-week recovery before returning to work. That is 42 days, or 6 × 7. If the employee needs to hand in a Fit Note every 28 days, that is exactly 4 weeks per certificate.
Payroll: A contractor quoted a rate per week needs their fee annualised. 52 weeks × 7 = 364 days; a leap year still has 52 weeks and 2 extra days, so weekly-rate contracts often cap at 52 weeks (364 days) with the remaining days handled separately.
Fractional weeks: 3.5 weeks = 3.5 × 7 = 24.5 days. Going the other way, 100 days ÷ 7 ≈ 14.29 weeks (14 weeks and 2 days).
Why weeks and months are not interchangeable
Months vary from 28 to 31 days, so converting weeks to months requires knowing which months. This tool deliberately avoids months and works only with the exact 7-day week, which never changes. Use it when precision matters and months would introduce ambiguity.
Everything is calculated locally in your browser — nothing is uploaded.