Your timetable · visible arithmetic
Fajr to sunrise duration calculator
Different calculation methods can produce different Fajr values, so both values remain explicit inputs.
The calculator reports their clock difference without hiding a method or solar-angle assumption.
Formula
How it is calculated
interval = (sunrise − Fajr) mod 24 h- Enter Fajr and sunrise from one timetable.
- Measure the forward interval.
- Keep the source method outside the arithmetic.
What the result means
The interval describes the supplied timetable values; it does not calculate Fajr or sunrise from solar coordinates.
All decision-bearing times, offsets or coordinates remain visible inputs. The page does not look up a hidden local convention, mosque timetable or current location.
Limits and local confirmation
The result is clock arithmetic, not a determination of when a prayer begins. Calculation methods, local observations, high-latitude rules and authority timetables can differ.
For worship planning, confirm the applicable times, method and interpretation with the local mosque or authority you follow.
Questions about this calculation
Does this Fajr-to-sunrise calculator choose prayer times for me?
No. It uses only the timetable values or coordinates you enter. Obtain prayer times and method guidance from a trusted local timetable, mosque or authority.
Does it store my values or location?
No. The arithmetic runs in your browser and the form does not submit coordinates, times or results to a server.
What happens when an interval crosses midnight?
Clock-interval tools move forward on a 24-hour clock, so an end time earlier than the start is treated as occurring on the following calendar day.
Need a full location-based timetable? Use the prayer times and Qibla calculator.