🗓️ Day Converter
Switch between days and any supported time unit.
Helpful for scheduling, project planning, and understanding durations across multiple scales.
3.5 Days (d) equals
84 Hours (h)
How to Use This Calculator
Choose the starting unit
Pick days or any other time unit you want to convert from.
Select the target unit
Pick the unit you want to convert to—hours, minutes, weeks, months, years, and more.
Enter the amount
Type the value and read the instant conversion plus a full breakdown of other units.
Formula
Conversion happens via seconds as the base unit.
Seconds = Value × (seconds per source unit)
Result = Seconds ÷ (seconds per target unit)
Months use the astronomical average: 1 month ≈ 30.436875 days.
Use the formula breakdown to confirm the calculation logic or perform the conversion manually if needed.
Full Description
Days sit between hours and weeks, but planning often requires precise conversions to minutes, months, or years. This converter uses exact SI relationships (via seconds) and the astronomical average for months to ensure consistent results.
Because months vary in length, the tool uses the average Gregorian month (365.25 days ÷ 12). When working with specific calendar months, adjust for the actual day count.
The breakdown table helps you compare the same duration across multiple time units without re-entering data.
Frequently Asked Questions
Why use an average month length?
Months have 28–31 days. The astronomical average (30.4369 days) provides a consistent baseline for planning and analytics.
Can I convert negative values?
Yes, if you need to represent offsets or time differences. Negative values work with the same math.
Does this handle leap years?
Years use the 365.25-day astronomical average, which factors in leap years over a long period.
What if I need business days?
This tool converts absolute time. For business-day calculations, layer on working-day rules separately.