Day Length
Calculate Day Length instantly with the exact formula and a worked example.
Day Length
Latitude (north +, south −)°
Month
Day of month
Daylight length
17.5564h
In hours and minutes
17:33
Night
6.44h
Solar declination
23.44°
More about: Day Length
What it calculates
The “Day Length” calculator computes Daylight length in h from 3 parameters: latitude (north +, south −) (°), month, day of month.
Works out dates, durations, and time differences.
Example calculation
With parameters Latitude (north +, south −) = 55.75 °, Month = 6, Day of month = 21 the result is 17.56 h.
How to use
- Enter latitude (north +, south −), month and day of month — each field above is adjustable with a slider.
- Daylight length (h) is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is Day Length calculated?
The Day Length calculator computes Daylight length (in h) from latitude (north +, south −), month, day of month. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Day Length calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.
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