Every rule in the calculator, and every expected answer in its test suite, cites where it comes from. A test with no source is not a test. These are the works those citations point to.
Primary texts
- The Qur'an, 4:11 — the shares of children and parents.
- The Qur'an, 4:12 — the shares of spouses and of maternal half-siblings.
- The Qur'an, 4:176 — the kalala verse, on full and paternal half-siblings.
Hadith
- The report of al-Mughira b. Shu'ba on the grandmother's sixth (Abu Dawud).
- The ruling of Ibn Mas'ud on the daughter, the son's daughter and the sister, reported by al-Bukhari — the basis for the completing sixth.
- The hadith of Sa'd b. Abi Waqqas limiting a bequest to one third (al-Bukhari, Muslim).
- "The killer does not inherit" (Ibn Majah, al-Tirmidhi).
- "The Muslim does not inherit from the disbeliever, nor the disbeliever from the Muslim" (al-Bukhari, Muslim).
Classical manuals
- al-Sajawandi, al-Fara'id al-Sirajiyya — the standard Hanafi manual, and the backbone of the rule tables used here.
- Ibn Rushd, Bidayat al-Mujtahid, kitab al-fara'id — the comparative source for the points where the four schools diverge.
Statute
- Muslim Family Laws Ordinance 1961 (Pakistan), section 4 — representation for the children of a predeceased son or daughter.
A note on how these are used
Citing a source is not the same as being reviewed by someone qualified in it. The rules here were read out of these works by a developer, not derived by a scholar, and the difference matters. Until a qualified reviewer in each school has signed off the worked cases, treat the output as a careful draft. What has been done, and what is still outstanding, is set out on the Methodology page.