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Ramadan Fasting Hours Calculator | Fajr to Maghrib

Quick reference

Approximate first-day fast lengths, Ramadan 1447:

City	Fajr	Maghrib	Fast
Makkah	05:21	18:13	12 h 52 m
London	05:04	17:33	12 h 29 m
New York	05:24	17:45	12 h 21 m
Karachi	05:46	18:19	12 h 33 m

public Latitude effect

schedule The 11-day shift

tune Method matters

water_drop Suhoor timing

lightbulb A real example — London, Ramadan 1447

London (51.5°N), MWL method, first day of Ramadan 1447.

Result: Fast ≈ 12 h 29 m (Fajr ~05:04, Maghrib ~17:33), lengthening to about 13 h 15 m by day 26.

What this means: Because Ramadan 1447 sits near the equinox, London's fasts are mild — a striking contrast to the ~19 h fasts of the June Ramadans of the 2010s.

Formula & methodology

Formula: Fast hours = Maghrib − Fajr (solar depression angles: Fajr −18°/−15°/−19.5° by method; Maghrib = sunset + 1 min)

How fast length is computed

Fasting runs from Fajr (true dawn, when the sun reaches a set angle below the horizon) to Maghrib (sunset). Prayer-time algorithms solve the sun's depression angle for your coordinates:

MWL: Fajr at 18°, Maghrib at sunset
ISNA: Fajr at 15°
Egyptian General Authority: Fajr at 19.5°
Umm al-Qura (Makkah): Fajr at 18.5°, Maghrib +90 min (EPT)

Higher latitude and mid-summer Ramadan stretch fasts toward 18–20+ hours in northern Europe, while equatorial fasts stay near 13 hours year-round. The calculator samples six days across Ramadan 1447 (expected ≈ 18 Feb – 19 Mar 2026) to show the drift.

Authoritative source: PrayTimes.org

Frequently asked questions

How many hours is a Ramadan fast?

Between Fajr and Maghrib — roughly 12–14 hours for most of the world's Muslims, stretching past 18 hours at high latitudes in summer Ramadans.

What time does the fast start and end?

It starts at Fajr (true dawn, before sunrise) and ends at Maghrib (sunset). Exact clock times depend on your coordinates and calculation method.

Why do fasting hours differ between countries?

Day length varies with latitude and season. Two cities on the same day can differ by 4+ hours; the same city differs across the month as Ramadan drifts.

Which prayer-time method should I follow?

Follow your local mosque's convention: MWL in Europe, ISNA in North America, Egyptian authority in Africa/Levant, Umm al-Qura in Saudi Arabia.

What happens in places with midnight sun or polar night?

Above the Arctic Circle the sun may not set — or not rise — during Ramadan, so clock-based fasting breaks down. Common scholarly solutions include following the timings of the nearest city with normal day–night cycles, or following Makkah time; conventions vary between scholars and communities. The calculator handles high latitudes mathematically, but the religious ruling is a question for a qualified scholar.

Why do fasting hours change through the month?

Ramadan follows the lunar calendar, drifting about 11 days earlier each solar year, while day length changes as solar declination shifts through the month. A Ramadan starting near the equinox sees fasts lengthen by roughly an hour from day 1 to day 29 in mid-latitudes. The calculator's day 1/6/11/16/21/26 sampling exists precisely to show this drift.

Do fasting hours change with daylight saving time?

The astronomical fast length does not change, but the clock times shift by an hour when DST starts or ends mid-Ramadan — which happens in some years. Your Fajr alarm effectively moves. The calculator uses standard local-time conventions for the selected year, so cross-check the week of the clock change against your local mosque timetable.

How do travelers and the ill use these timings?

The calculator gives the same Fajr-to-Maghrib window for everyone at a location; travelers, the ill, pregnant women and others with valid exemptions use the same timetable on days they do fast, and make up or compensate for missed days according to their school's rulings. Exemption rules differ between madhhabs, so this is descriptive timing information, not a religious ruling.

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Every CalcaTools Islamic calculator — zakat and charity, prayer times, the Hijri calendar, halal finance, and family tools — cross-checked against the Umm al-Qura calendar and classical fiqh references.

Ramadan Fasting Hours Calculator | Fajr to Maghrib

Quick reference

public Latitude effect

schedule The 11-day shift

tune Method matters

water_drop Suhoor timing

lightbulb A real example — London, Ramadan 1447

Formula & methodology

How fast length is computed

Frequently asked questions

Explore the full Islamic toolkit

Zakat & charity

Prayer & worship

Hijri calendar & dates

Halal finance & pilgrimage

Family & lifestyle

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