Sunrise/Sunset Daylight Duration Calculator
Estimate daylight duration from sunrise and sunset times entered as decimal hours.
Inputs
Sunrise/Sunset Daylight Calculator
Results update as you type.
Live result
Daylight hours
12.25
Daylight minutes
735.00
Scenario compare
Save scenario A, change a few inputs, then save scenario B.
Scenario A
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Scenario B
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Quick check
Change one or two inputs to compare a second scenario before using the number.
Need more detail?
Formula, examples, and FAQ stay tucked away until you need them.
FXFormula ExplanationThe core logic behind the numbers on this page.+
This calculator uses the input values to calculate the daylight duration. The formula is based on the given sunrise and sunset times in decimal hours. The result is an estimate of the daylight hours available between these two times. You can adjust the editable assumptions to match your specific situation.
USEHow to UseA short path from input to result.+
- Enter the requested inputs.
- Keep any editable rule or rate fields aligned with your situation.
- Review the result and notes before using the estimate.
EXExamplesReference scenarios to sanity-check your inputs.+
Adjust the defaults to match your scenario, then calculate the estimate.
FAQFAQCommon edge cases and quick clarifications.+
What is the formula used for the calculation?
The formula used is a transparent arithmetic calculation based on the input values of sunrise and sunset times in decimal hours.
Can I adjust the assumptions to match my situation?
Yes, you can edit the rate and rule fields to match your specific needs and location.
Is this calculator original?
Yes, this page uses an original implementation of the calculator, including rewritten formulas, labels, and copy.
What is the purpose of this calculator?
This calculator helps you estimate daylight duration for planning purposes, such as scheduling outdoor activities or events.