Tools for the Muslim day and year. Your location is used in the browser to compute times and directions, and is never stored or uploaded.
Prayer times, the qibla direction and Hijri dates are all produced by astronomical calculation: solar altitude and azimuth, great-circle bearings on the earth ellipsoid, the lunar synodic cycle. At that layer there is a single correct answer.
But choosing the convention the calculation runs under belongs to religious judgement, and that is where values diverge between schools and organisations. These tools calculate without ruling — and always show which convention produced the number.
The largest divergence is the twilight angle used for Fajr and Isha. Both are defined by how far the sun sits below the horizon, and the Muslim World League, the Egyptian General Authority, Umm al-Qura, ISNA and the University of Karachi each set that angle differently. At the same location Fajr can differ by more than twenty minutes.
Asr divides by school of law. The majority position takes the time when an object's shadow equals one times its own length; the Hanafi position takes twice. That alone can shift Asr by close to an hour.
High latitudes make it harder still. In summer the sun never drops below the reference angle, so there are days when Fajr or Isha simply do not occur. Adjustment rules — nearest latitude, dividing the night into fixed proportions, and others — fill the gap, and those also differ by organisation.
On a near-spherical earth the shortest path between two points is a great circle, not the straight line drawn on a flat map. That is why the direction to Mecca can look south-west on a map projection while the true great-circle bearing points closer to west-north-west.
The discrepancy grows with distance, so reading a bearing straight off a flat map goes badly wrong for far-away locations.
When using a phone compass, account for magnetic declination — the difference between magnetic and true north, which varies by location and drifts slowly over time. Indoor metal, speakers and electronics also disturb the sensor, so it is worth re-checking outdoors.
The Hijri calendar is purely lunar, so a month is either 29 or 30 days. Which one depends on whether the new crescent is sighted, and there are two approaches: fixing it in advance by astronomical calculation (tabular Hijri), or announcing it after actual observation.
That is why the first day of Ramadan can differ by a day between countries. It is not an error; it is a structural consequence of observation-based determination.
The converter here uses a widely adopted calculated Hijri calendar. For dates that carry religious obligation, follow the authoritative announcement where you live. The calculated value is useful for planning ahead; confirmation comes from there.
The skeleton is simple: above a threshold (nisab), a fixed proportion of qualifying wealth is due. The complexity starts with what counts as qualifying wealth.
The nisab itself differs substantially depending on whether it is set against gold or silver — the silver standard is lower, so more people fall within scope. Beyond that, the start of the haul (the lunar year of possession), how far debts are deducted, the treatment of business inventory and receivables, and the valuation point for pensions and investments all require a decision.
The calculator presents those options and computes accordingly. Which basis fits your situation is a question for a scholar or institution you trust.
Prayer times and qibla need an accurate position. The browser's location permission is used, and the coordinates are used only for the calculation — never transmitted or stored. If you prefer not to grant the permission, you can select a city instead.
Asset figures entered for zakat are likewise processed entirely in the browser. With no account, nothing is tied to an identity.
They do not issue rulings and do not decide which school or organisation is correct. What they do ends at showing the calculation transparently for the convention you selected.
Questions of obligation and exception — travel, illness, fasting at extreme latitudes — belong to a qualified scholar.