Which calculation methods are supported?

Four methods: ISNA (18°/17°), Muslim World League (18°/17°), Egyptian General Authority (19.5°/17.5°), and Umm al-Qura (18.5°/90 min after Maghrib for Isha). Each uses different twilight angles for Fajr and Isha.

What is the difference between Shafi and Hanafi Asr?

Shafi (also Maliki and Hanbali) calculates Asr when the shadow of an object equals its height plus the morning shadow length. Hanafi uses twice the object height plus morning shadow, producing a later Asr time.

Are these times accurate enough to use?

The algorithm matches the output of established Islamic prayer time libraries to within one minute for most locations. At extreme latitudes (above ~60°) or during polar twilight conditions the results may be undefined; the tool will show "—" in those cases.

Why might the result differ from my mosque timetable?

Local mosque timetables often add safety margins (typically 1–3 minutes) or use rounded values. Elevations above sea level, atmospheric refraction adjustments, and local convention also introduce small differences.

Does this tool use my location automatically?

No data is sent to any server. You enter coordinates manually, or you can click "Use My Location" to let your browser supply them via the Geolocation API (optional, browser-prompted).

Islamic Prayer Times Helper

Name: Islamic Prayer Times Helper
Availability: InStock
Author: Nham Vu

Calculate the five daily Islamic prayer times (Fajr, Dhuhr, Asr, Maghrib, Isha) for any location and date using standard astronomical algorithms.

Location & Settings

Latitude

Longitude

UTC Offset

Date

Calculation Method

Asr School

Prayer Times

Prayer	Time

These are calculated estimates. Local mosque timetables may differ by 1–3 minutes due to safety margins or local convention.

Algorithm: Solar declination and equation of time follow Jean Meeus Astronomical Algorithms (2nd ed.). Sun transit (Dhuhr) = 12 + timezone − longitude/15 − equation-of-time/60. Fajr and Isha are derived from the angle-based hour angle formula. Asr uses the standard shadow-ratio method (Shafi: 1×, Hanafi: 2×).

Summary

Calculate the five daily Islamic prayer times (Fajr, Dhuhr, Asr, Maghrib, Isha) for any location and date using standard astronomical algorithms.

How it works

Enter your decimal latitude and longitude (e.g. 40.7128, -74.0060 for New York).
Pick your UTC timezone offset from the dropdown and choose a date.
Select a calculation method (ISNA, Muslim World League, Egyptian, or Umm al-Qura) and Asr school (Shafi or Hanafi).
Click Calculate — the tool applies the Jean Meeus astronomical algorithm to find solar declination, equation of time, hour angles, and transit time.
The five prayer times and sunrise appear in a table in HH:MM AM/PM format.

Use cases

Find prayer times when traveling to a city where you do not know the local mosque schedule.
Cross-check times from a prayer app against the raw astronomical calculation.
Study how latitude, season, and calculation method affect Fajr and Isha angles.
Determine prayer times for a remote location with no nearby mosque or internet lookup service.

Frequently Asked Questions

Last updated: 2026-06-24 · Reviewed by Nham Vu