Everyday Calculation

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Calculators » Date & Time » hh:mm:ss and decimal hour conversion

Hours-minutes-seconds to decimal hour converter


Our online tools will provide quick answers to your calculation and conversion needs. On this page, you can convert time values specified in hours-minutes-seconds (HMS) to decimal hours and vice-versa.

Enter time value you want to convert from:

: :

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Each hour is divided into 60 minutes, each of which is further sub-divided into 60 seconds.

hh:mm:ss to decimal hour conversion

dh = hh + mm/60 + ss/3600

Decimal hour to hh:mm:ss conversion

hh = ⌊dh⌋
mm = ⌊(dh - hh) * 60⌋
ss = ((dh - hh) * 60 - mm) * 60
dh = decimal hour
hh = hours
mm = minutes
ss = seconds

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