Fidamen

Convert Days to Weeks – Time Converter

This converter translates a quantity expressed in days into the equivalent number of weeks using the fixed relationship 1 week = 7 days. It supports exact fractional results as well as common rounding modes (e.g., round to 2 decimals, floor to whole weeks, or show full weeks plus leftover days).

Use this tool for calendar planning, project timelines, reporting durations, or quick mental checks. It does not attempt to interpret calendar-specific constructs such as ISO week numbers, business-week definitions, or daylight-saving transitions; those are addressed in the methodology and glossary.

Updated Nov 19, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record af76d4a05202 • Reviewed by Fidamen Standards Committee

Interactive Converter

Convert between day and week with precision rounding.

Quick reference table

DayWeek
DAY 1.00 d0.1429 wk
DAY 5.00 d0.7143 wk
DAY 10.00 d1.4286 wk
DAY 25.00 d3.5714 wk
DAY 50.00 d7.1429 wk
DAY 100.00 d14.2857 wk

Methodology

The conversion is performed with the fixed mathematical ratio weeks = days ÷ 7. This is a deterministic arithmetic transformation and does not require external reference data.

When presenting results, users may choose different representations: a decimal number of weeks, an integer count of full weeks plus remaining days, or a rounded value to a chosen precision. We recommend explicitly stating the rounding rule used when reporting durations.

Standards and authoritative sources guide time representation and reporting. For week numbering and calendar semantics consult ISO 8601; for high-precision timekeeping and calibration practices consult NIST guidance. Occupational definitions of a workweek may differ from a calendar week; consult relevant workplace regulations (for example, OSHA) when converting for compliance or payroll.

Key takeaways

Conversion rule is fixed and simple: divide days by 7 to get weeks.

Report both exact and rounded values, and when converting for legal, payroll, or regulatory purposes verify the applicable rules before relying on the numeric result.

Worked examples

10 days → 10 ÷ 7 = 1.428571... weeks. Display as 1.4286 weeks (rounded to 4 decimals) or 1 week and 3 days (full weeks plus remainder).

14 days → 14 ÷ 7 = 2 weeks exactly.

30 days → 30 ÷ 7 = 4.285714... weeks. Rounded to 2 decimals = 4.29 weeks; as full weeks plus days = 4 weeks and 2 days.

F.A.Q.

Does this conversion account for calendar week numbering (ISO weeks)?

No. This converter uses the pure arithmetic ratio 1 week = 7 days. ISO week numbering (ISO 8601) defines which calendar week a date belongs to and can shift week numbers across years; that is a separate calendar operation not performed here.

How should I report partial weeks for payroll or compliance?

For payroll or regulatory reporting, follow the rounding and aggregation rules specified by the applicable authority or employer policy. This tool provides the numeric conversion; do not assume it meets legal or payroll rules without verifying local regulations and employer policies (consult OSHA or your payroll provider if needed).

What rounding options are recommended?

Display both the exact fractional result and a rounded value. Common practice is 2 decimal places for general reporting and 4+ decimals for scientific or planning use. For counts of weeks used in scheduling, prefer an integer count of full weeks plus leftover days to avoid ambiguity.

Are leap seconds or daylight saving time adjustments relevant?

No. Leap seconds and daylight saving time affect clock time measurements, not the calendrical day-to-week arithmetic used here. This conversion treats a day as the calendar day unit and a week as seven such days.

Can I convert workdays to weeks with this tool?

Not directly. A 'workweek' or 'business week' may contain 5 workdays, 6, or other definitions. To convert workdays to calendar weeks first map workdays to calendar days (for example, 5 workdays = 1 standard business week) then use the appropriate ratio; document the mapping used.

Sources & citations

Further resources

Versioning & Change Control

Audit record (versions, QA runs, reviewer sign-off, and evidence).

Record ID: af76d4a05202

What changed (latest)

v1.0.0 • 2025-11-19 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Public QA status

PASS — golden 25 + edge 120

Last run: 2026-01-23 • Run: golden-edge-2026-01-23

Engine

v1.0.0

Data

Baseline (no external datasets)

Content

v1.0.0

UI

v1.0.0

Governance

Last updated: Nov 19, 2025

Reviewed by: Fidamen Standards Committee (Review board)

Credentials: Internal QA

Risk level: low

Reviewer profile (entity)

Fidamen Standards Committee

Review board

Internal QA

Entity ID: https://fidamen.com/reviewers/fidamen-standards-committee#person

Semantic versioning

  • MAJOR: Calculation outputs can change for the same inputs (formula, rounding policy, assumptions).
  • MINOR: New features or fields that do not change existing outputs for the same inputs.
  • PATCH: Bug fixes, copy edits, or accessibility changes that do not change intended outputs except for previously incorrect cases.

Review protocol

  • Verify formulas and unit definitions against primary standards or datasets.
  • Run golden-case regression suite and edge-case suite.
  • Record reviewer sign-off with credentials and scope.
  • Document assumptions, limitations, and jurisdiction applicability.

Assumptions & limitations

  • Uses exact unit definitions from the Fidamen conversion library.
  • Internal calculations use double precision; display rounding follows the unit's configured decimal places.
  • Not a substitute for calibrated instruments in regulated contexts.
  • Jurisdiction-specific rules may require official guidance.

Change log

v1.0.0 • 2025-11-19 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Areas: engine, content, ui • Reviewer: Fidamen Standards Committee • Entry ID: 5a89fca4b156