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Weeks to Days (wk to d)

Convert weeks to days: 1 wk = 7 d. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

Formula

1 wk = 7 d

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

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 wk = 35 d
12.5 wk = 87.5 d
100 wk = 700 d

Weeks to days conversion table

Weeks (wk)	Days (d)
1	7
2	14
3	21
4	28
5	35
6	42
7	49
8	56
9	63
10	70
15	105
20	140
25	175
30	210
40	280
50	350
75	525
100	700
200	1400
250	1750
500	3500
1000	7000

FAQ

How many days are in one week?

1 wk = 7 d. 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 weeks to days?

Multiply the value in weeks by 7: days = weeks × 7. For example, 5 wk = 35 d.

How do I convert days back to weeks?

Multiply by the inverse factor 0.1428571429 (weeks = days × 0.1428571429), or use the days-to-weeks page.

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Machine access

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