Free · Unit conversions

Days, Weeks & Fixed Duration Table

Convert days and weeks alongside hours, compound time, fixed months and Julian years in one reversible table.

  • Formula & worked example
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

Two weeks equal 14 days, 336 hours or 1,209,600 seconds. This table uses fixed 24-hour days.

Weeks = days ÷ 7; hours = days × 24

Worked example

Enter these known values and leave the other values blank.

Duration in weeks
2 wks
Duration in days
14 days
Julian years (365.25 days)
0.03833 yrs
Fixed months (30.4375 days)
0.46 mos
Duration in hours
336 hrs
Duration in minutes
20160 min
Duration in seconds
1209600 sec
Hours:minutes:seconds
336:0:0 hrs / min / sec

Assumptions and limitations

  • One minute is 60 seconds, an hour is 60 minutes, a day is 24 hours and a week is seven days.
  • A year here means exactly 365.25 days (Julian year); the fixed month is one twelfth of that year, or 30.4375 days. These are duration conventions, not calendar month lengths.
  • Compound time uses hours:minutes:seconds. A fractional final unit remains a fractional duration; no date, time zone, daylight-saving change or leap-second schedule is applied.
  • Signed values are allowed as signed duration offsets.

Common questions

Why do six months equal 182.625 days?

This converter uses a fixed month of 30.4375 days. Six actual calendar months can have a different length.

Does it calculate a finish date?

No. It converts elapsed quantities using fixed unit factors. Calendar dates need a date-aware calculation.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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