Convert Weeks to Days

Because a week is defined as exactly 7 days everywhere – there’s no calendar variation, no leap weeks, no daylight-saving drift in week-length math. Months and years vary; weeks and days don’t.

The ISO 8601 “week of the year” varies between 52 and 53 weeks per year, but each individual ISO week is still exactly 7 days. So N weeks × 7 = N × 7 days regardless of which weeks you mean.

No. DST changes wall-clock time (one day in spring is 23 hours, one day in autumn is 25 hours), but the “day” unit in week-length math is the abstract 24-hour day. If you need DST-aware calculations, use a calendar-aware datetime tool with timezone support.

For fractional values, it splits the result into whole days + leftover hours + leftover minutes. 1.5 weeks = 10.5 days = 10 days, 12 hours. 0.001 weeks = 0.007 days = 0 days, 0 hours, 10 minutes 4 seconds (approx).

Rejected with an explicit error. Negative durations are usually a sign of upstream calculation errors. If you have a directional duration (e.g., “3 days before”), handle the sign at your level.

Rejected. Now abc shows Error: Not a valid number: "abc".

Up to 6 decimal places. Beyond that, floating-point error makes additional precision meaningless. For exact rational results, multiply by 7 manually – no rounding involved for integer weeks.

No. Everything runs in your browser with JavaScript – nothing is sent to a server, logged, or stored, and the tool keeps working offline once the page has loaded.

Converting a list of values at once – paste a column from a spreadsheet, get a column back. Empty lines are preserved; bad lines show inline errors so you can fix them.

Not in this tool. Year length varies (365 or 366 days) so any weeks-to-years conversion needs to pick a definition (365.25 average? exact calendar?). Use a dedicated weeks-to-years tool with documented assumptions.