Day Converter — Convert Days to Hours, Weeks, Months & More
Convert any number of days to hours, minutes, seconds, weeks, months and years — or convert from any of those units back to days.
From
To
- 1
Convert to the target unit
1 d ÷ 0.04166667 = 24 hr
1 d =
| Second | 86,400 s |
| Minute | 1,440 min |
| Hour | 24 hr |
| Week | 0.142857 wk |
| Month (avg 30.44 days) | 0.032854 mo |
| Year (365.25 days) | 0.002738 yr |
Formula
How this is calculated
Every time unit in this converter is defined by a fixed number of days (the base unit). Sub-day units use exact factors: 1 hour = 1/24 day, 1 minute = 1/1440 day, 1 second = 1/86400 day. Weeks are exact: 1 week = 7 days. Months use the average Gregorian month of 365.25 ÷ 12 = 30.4375 days, and years use 365.25 days (the mean Julian year, averaged over the 4-year leap-year cycle). Conversion is a single multiplication: result = input × (source_factor / target_factor).
Note that calendar months vary from 28 to 31 days, so converting to months gives an average answer — the exact result depends on which specific months are spanned. For precise calendar arithmetic (e.g. "exactly 3 months from today"), use a date calculator. Seconds are the SI base unit of time, but days are the natural unit for multi-day durations, so this converter is ideal for deadline planning, project scheduling and travel time estimation.
No rounding is applied to the conversion factor itself; only the display is rounded, so converting back and forth may show tiny floating-point differences.
About this calculator
The day converter handles the most common time-duration conversions people need when planning projects, scheduling events or estimating delivery times. All conversions use a single shared base (the day): sub-day units (hours, minutes, seconds) are fractions of a day using exact factors, while weeks are an exact multiple (7 days). Months and years use average lengths — 30.4375 days per month and 365.25 days per year — which are correct for long-run averaging but not for specific calendar months. For calendar-exact answers, use the date difference or date addition calculators.
Frequently asked questions
Exactly 24 hours. Therefore, 1 day = 24 × 60 = 1,440 minutes and 24 × 3,600 = 86,400 seconds.
Calendar months vary from 28 to 31 days. This converter uses the average of 365.25 ÷ 12 ≈ 30.4375 days per month — accurate for long-run planning but not for any specific month.
The converter uses 365.25 days per year — the mean Julian year that accounts for one extra day every four years (leap year). A common Gregorian year is 365 days; a leap year is 366.
Also known as
TG we-Calculate Editorial Team. (2026). Day Converter — Convert Days to Hours, Weeks, Months & More [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/day-converter
TG we-Calculate Editorial Team. "Day Converter — Convert Days to Hours, Weeks, Months & More." TG we-Calculate. 2026. https://we-calculate.com/calculator/day-converter.
TG we-Calculate Editorial Team, "Day Converter — Convert Days to Hours, Weeks, Months & More," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/day-converter
@misc{wecalculate_day_converter, title = {Day Converter — Convert Days to Hours, Weeks, Months & More}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/day-converter}}, year = {2026}, note = {TG we-Calculate} }
Did this calculator help you?