Your timetable · visible arithmetic
Last third of the night calculator
Use Maghrib and the next Fajr from the same local timetable and method.
The tool divides that forward overnight interval into three equal durations.
Formula
How it is calculated
start of final third = Maghrib + ⅔ × night length- Enter Maghrib and the following Fajr.
- Divide their forward interval by three.
- Add two thirds to Maghrib.
What the result means
This is a transparent division of the entered clock interval. The page does not decide which timetable or night definition you should use.
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 last-third 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.