Days to Weeks (d to wk)

Formula

1 d = 0.142857 wk

weeks = days × 0.1428571429 — reverse: days = weeks × 7

The factor is derived from the SI definitions of both units (base unit: s) as listed in NIST SP 811; results on this page are shown to 6 significant figures, the API returns up to 12.

Worked examples

• 5 d = 0.714286 wk
• 12.5 d = 1.78571 wk
• 100 d = 14.2857 wk

Days to weeks conversion table

FAQ

How many weeks are in one day?

1 d = 0.142857 wk. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.

What is the formula to convert days to weeks?

Multiply the value in days by 0.1428571429: weeks = days × 0.1428571429. For example, 5 d = 0.714286 wk.

How do I convert weeks back to days?

Multiply by the inverse factor 7 (days = weeks × 7), or use the weeks-to-days page.

Related conversions

• Weeks to days (reverse)
• Time Converter — all time units in one tool
• Hours to Minutes
• Minutes to Hours
• Minutes to Seconds
• Seconds to Minutes
• Days to Hours
• Hours to Days
• Years (365 days) to Days
• Days to Years (365 days)

Machine access

• API: GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=day&to_unit=week
• MCP: server https://tttkmbb.com/mcp, tool convert_units with {"value":5,"from_unit":"day","to_unit":"week"}
• Markdown: https://tttkmbb.com/conversion/days-to-weeks.md · JSON: https://tttkmbb.com/conversion/days-to-weeks.json (add ?value= for a result) · Units: /api/v1/units?quantity=time
• OpenAPI operationId: convert_units. Freshness: static. Authentication: none.

Sources

• NIST Special Publication 811 – Guide for the Use of the International System of Units (SI), Appendix B conversion factors (standard)
• BIPM – The International System of Units (SI Brochure, 9th edition) (standard)
• Wikipedia – Conversion of units (reference)