Prayer Time Calculation Methods Explained
If you've ever opened a prayer-time app and seen a dropdown with names like MWL, ISNA, Umm Al-Qura, Karachi, Egyptian — and wondered which one to pick — this guide is for you. The choice affects mainly Fajr and Isha, which in turn affects your daily routine. Here's what each method actually means, and a simple rule to choose the right one.
Why methods differ
Three of the five daily prayers (Dhuhr, Asr, Maghrib) are tied to easily-observed solar events: solar noon, when a shadow equals its object's height, and sunset. All major methods agree on those.
Fajr and Isha, however, are defined by the twilight angle — how far the sun is below the horizon at dawn (true fajr) and at night (true isha). Different Islamic authorities have historically observed different twilight angles for their regions, giving different Fajr and Isha times.
The main methods at a glance
| Method | Fajr angle | Isha angle | Best for |
|---|---|---|---|
| Muslim World League (MWL) | 18° | 17° | Europe, Far East |
| Islamic Society of North America (ISNA) | 15° | 15° | North America |
| Egyptian General Authority | 19.5° | 17.5° | Africa, Syria, Iraq, Lebanon |
| Umm Al-Qura (Makkah) | 18.5° | 90 min after Maghrib | Saudi Arabia (incl. Ramadan: 120 min) |
| University of Islamic Sciences, Karachi | 18° | 18° | Pakistan, Bangladesh, India, Afghanistan |
| Institute of Geophysics, Tehran | 17.7° | 14° | Iran, some Shia communities |
| Shia Ithna Ashari, Jafari | 16° | 14° | Shia communities |
Method-by-method explanation
Muslim World League (MWL)
Adopted by many European and Far Eastern countries. Fajr 18°, Isha 17°. A balanced default for regions that don't have their own official body.
ISNA (Islamic Society of North America)
Fajr 15°, Isha 15°. Slightly later Fajr and earlier Isha compared to MWL, which better matches how the horizon actually looks in the high-latitude parts of North America (Canada, northern US). Widely used in the US and Canada.
Egyptian General Authority
Fajr 19.5°, Isha 17.5°. Historically very common across Africa, Syria, Iraq, Lebanon, and other Arab countries. Gives a slightly earlier Fajr than MWL.
Umm Al-Qura (Makkah)
The official method of the Kingdom of Saudi Arabia. Fajr 18.5°. Isha is special: it's fixed at 90 minutes after Maghrib (rather than a twilight angle), and 120 minutes during Ramadan. If you live in Saudi Arabia or follow Haramain times, this is the match.
University of Islamic Sciences, Karachi
Fajr 18°, Isha 18°. The standard across Pakistan, Bangladesh, India, Afghanistan, and parts of the UAE.
Institute of Geophysics, Tehran / Shia Jafari
Primarily used by Iranian and Shia communities. Has slightly different Fajr/Isha angles and a different Maghrib (some Shia scholars define Maghrib as when the red twilight disappears, a few minutes after sunset).
How to choose: a simple rule
Match your local mosque. Walk or call your nearest mosque and ask which method they use. Set your app to the same method and your times will align with the Adhan you hear. That's the best answer in 99% of cases.
If you can't reach a local mosque, use this region-based default:
- USA / Canada → ISNA
- UK / Western Europe / Far East → MWL
- Saudi Arabia / Gulf → Umm Al-Qura
- Egypt / Middle East / North Africa → Egyptian
- Pakistan / India / Bangladesh → Karachi
- Iran / Shia communities → Tehran or Jafari
What about high latitudes?
Above ~48° latitude (most of the UK, northern Europe, Canada, parts of the northern USA), the sun may not go below 18° below the horizon in summer, which means Fajr and Isha by angle method become undefined for part of the year. Common scholarly solutions include:
- Nearest day: use the Fajr/Isha times of the most recent day where the angle is valid.
- Middle of the night: define Isha as the midpoint between Maghrib and next day's Fajr, and Fajr as 1/7th before sunrise.
- One-seventh of the night: standard Hanafi/Maliki adjustment.
- Makkah-based: some follow the times of Makkah.
Most modern prayer-time apps (including Azkar) let you select a high-latitude adjustment separately from the primary method.
Asr: Shafi'i vs. Hanafi
A separate choice: Asr time has two valid opinions.
- Standard (Shafi'i, Maliki, Hanbali): Asr begins when an object's shadow equals its own length plus its shadow at Dhuhr.
- Hanafi: Asr begins when the shadow equals twice the object's length. This gives a later Asr time.
This is independent of the Fajr/Isha method. Pick the school of thought your family or community follows.
Common mistakes
- Using the default without thinking. The default in many apps is MWL. If your mosque uses ISNA, Egyptian, or Umm Al-Qura, your Adhan will be off by several minutes.
- Changing methods mid-month. Pick a method and stick with it for at least a full year to avoid confusion.
- Ignoring the Asr choice. If you or your family are Hanafi, setting the app to "standard" Asr can cause you to pray early.
- Forgetting DST. Prayer times adjust automatically for time zones; make sure your phone's clock is set correctly.
How Azkar handles calculation methods
In the Azkar app, Settings → Prayer Times lets you:
- Pick the primary calculation method (all methods above are supported)
- Pick the Asr school of thought (standard or Hanafi)
- Pick a high-latitude adjustment rule
- Override individual prayer times with a minute offset (useful if your local mosque announces a slightly different time)
Once configured, your daily prayer times, notifications, and any PDF timetable you generate all use the same settings.
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