Ramadan Fasting Times Calculator
The Islamic calendar shifts 11 days every year. Calculate exactly how many hours you will fast depending on your global location and the season.
Standardization model: Latitudinal Algorithmic Equation extracting Dawn/Dusk deltas by season.
Ramadan Fasting Times Calculator Methodology & Instructions
Step-By-Step Guide
- Select your geographical region (Latitude).
- Select the theoretical solar season that Ramadan is currently falling into.
- Click calculate to determine the estimated hours of daylight fasting.
- View the hydration window to plan your fluid intake at night.
Latitudinal Shift Algorithm
Fasting Duration = (Sunset Time) - (Dawn Time) adjusted for latitudinal shift
Understanding Your Results
| Hemisphere / Region | Summer Fasting (Hours) | Winter Fasting (Hours) |
|---|---|---|
| Northern (Europe/Canada) | 18 to 22+ Hours | 8 to 11 Hours |
| Equatorial (Middle East/Africa) | 14 to 15 Hours | 13 to 14 Hours |
| Southern (Australia/South America) | 10 to 12 Hours | 14 to 16 Hours |
Frequently Asked Questions
How are fasting times calculated?
Fasting begins at Fajr (dawn) and ends at Maghrib (sunset). The exact duration shifts daily based on the suns position relative to your geographical latitude.
Why do fasting hours vary globally?
Because the Islamic calendar is lunar, Ramadan shifts backwards by 11 days each solar year. If Ramadan falls in summer in the Northern Hemisphere, daylight hours (and thus fasts) can exceed 18 hours.
Primary Reference Sources: Islamic Fiqh Council (High Latitude Fasting Rules)
Standardized Calculation Engine · Last updated July 6, 2026