A week is defined as exactly 7 days — a simple, fixed conversion useful for pregnancy tracking, project timelines, or any duration given in the “wrong” unit.
How it works
Dividing days by 7 gives weeks; multiplying weeks by 7 gives days back. Type into either field and the other updates instantly.
What this does not include
This does not include months or years — for those, use this site’s months-to-years calculator instead.
How to use this calculator
- Enter a value in either days or weeks — the other field fills in automatically.
Frequently asked questions
Where is this conversion commonly needed?
Pregnancy tracking (often given in weeks), project timelines, and comparing durations quoted in different units.
Can this handle fractional weeks?
Yes — entering 10 days converts to exactly 1.4286 weeks, and any fractional value works the same way in both directions.
Is a week always exactly 7 days?
Yes, by definition — this is one of the most stable, unchanging unit relationships in everyday use.
