Hours to Days Converter (h to d)

Hours

The hour is a unit of time equal to exactly 3,600 seconds (60 minutes), deriving from the ancient Egyptian division of the day into 24 equal parts. In science, hours are commonly used for expressing reaction rates, half-lives of radioactive isotopes, pharmacokinetic parameters, and electrical energy consumption (kilowatt-hours).

Days

The day is defined for civil timekeeping as exactly 86,400 seconds (24 hours). Two definitions coexist in astronomy: the solar day (averaging 86,400 seconds) and the sidereal day (approximately 86,164 seconds — 4 minutes shorter), as Earth must rotate slightly more than 360° to bring the Sun back to the same sky position due to its orbital motion. In medicine, the circadian rhythm operates on a near-24-hour cycle tightly coupled to the solar day.

Hours (h) to Days (d) - Conversion Table
Hours (h)	Days (d)
0.1 h	0.00417 d
1 h	0.0417 d
2 h	0.0833 d
3 h	0.125 d
5 h	0.2083 d
10 h	0.4167 d
20 h	0.8333 d
30 h	1.25 d
50 h	2.0833 d
100 h	4.1667 d
1000 h	41.6667 d

Frequently Asked Questions (FAQ)

How many days are in 1 hours?

1 hours (h) is exactly 0.041667 days (d).

How do I convert hours to days?

Multiply the value in hours by 0.041667 to get the result in days. Or use the converter above — type any number and see the result instantly.

Convert Hours (h) to other units of Time

Conversions from Hours
‣ Hours (h) to Nanoseconds (ns)
‣ Hours (h) to Microseconds (μs)
‣ Hours (h) to Milliseconds (ms)
‣ Hours (h) to Seconds (s)
‣ Hours (h) to Minutes (min)
‣ Hours (h) to Hours (h)
‣ Hours (h) to Days (d)
‣ Hours (h) to Weeks (wk)
‣ Hours (h) to Fortnights (fn)
‣ Hours (h) to Months (mo)
‣ Hours (h) to Years (yr)
‣ Hours (h) to Decades (dec)
‣ Hours (h) to Centuries (c.)
‣ Hours (h) to Millennia (mil.)

Conversions to Hours
‣ Nanoseconds (ns) to Hours (h)
‣ Microseconds (μs) to Hours (h)
‣ Milliseconds (ms) to Hours (h)
‣ Seconds (s) to Hours (h)
‣ Minutes (min) to Hours (h)
‣ Hours (h) to Hours (h)
‣ Days (d) to Hours (h)
‣ Weeks (wk) to Hours (h)
‣ Fortnights (fn) to Hours (h)
‣ Months (mo) to Hours (h)
‣ Years (yr) to Hours (h)
‣ Decades (dec) to Hours (h)
‣ Centuries (c.) to Hours (h)
‣ Millennia (mil.) to Hours (h)