How to convert days to weeks
Every day is 0.1429 weeks, so the conversion is a single multiplication:
Worked example: 25 d → 25 × 0.142857 = 3.5714 wk.
Quick mental estimate: Divide by 7: 25 ÷ 7 ≈ 3.5714 wk (exact: 3.5714).
Days to weeks conversion table
| Days (d) | Weeks (wk) |
|---|---|
| 1 d | 0.1429 wk |
| 2 d | 0.2857 wk |
| 3 d | 0.4286 wk |
| 5 d | 0.7143 wk |
| 10 d | 1.4286 wk |
| 15 d | 2.1429 wk |
| 20 d | 2.8571 wk |
| 25 d | 3.5714 wk |
| 50 d | 7.1429 wk |
| 75 d | 10.7143 wk |
| 100 d | 14.2857 wk |
| 200 d | 28.5714 wk |
| 250 d | 35.7143 wk |
| 500 d | 71.4285 wk |
| 1,000 d | 142.86 wk |
Values rounded to four decimals. For a value that is not in the table, use the converter above — it accepts decimals and negative numbers.
When you need this conversion
- Project planning and deadlines, where a duration given in one unit has to be turned into the granularity your schedule uses.
- Billing and payroll: hours worked converted into days, or a rate quoted per unit of time.
- Cooking, exercise, media durations and any timer set from a figure written in another unit.
Getting it right
The arithmetic is a single multiplication, so mistakes almost never come from the calculation itself — they come from the value that goes into it. Check that the figure you are converting really is in days and not in a neighbouring unit, and that you have not already converted it once.
Sanity-check the direction of the result before you use it. One day is 0.1429 weeks, so converting days to weeks should make the number smaller. If it moved the other way, the conversion was applied backwards — the reverse converter is one click away.
About the units
Day (d)
The day is 24 hours, or 86 400 seconds. Deadlines, rentals, leave and interest are counted in days.
Week (wk)
The week is 7 days. Schedules, pregnancy, payroll and project plans are counted in weeks.
Frequently asked questions
How many weeks are in 1 day?
1 day equals 0.1429 weeks. To convert any value, multiply the number of days by 0.142857.
How do I convert days to weeks in my head?
Divide by 7: 25 ÷ 7 ≈ 3.5714 wk (exact: 3.5714).
Is the d to wk conversion exact?
The factor is a standard rounded value; for most purposes four significant figures are more than enough.
How do I convert days to weeks in Excel or Google Sheets?
Put the value in A1 and use =A1*0.142857. Multiplying by the factor works in every spreadsheet, in any programming language, and on a basic calculator.
How many decimal places should I keep?
For everyday use two decimals are plenty. Keep four if the result feeds another calculation, and round only at the very end — rounding intermediate steps is the most common reason a result comes out slightly wrong.