Scope of version 1.0

What it calculates

• Fixed Quranic shares (furud)Sources:Quran 4:11 (Shares of children and parents, after debts and bequests; opens in a new tab)·Quran 4:12 (Shares of spouses and maternal siblings, after debts and bequests; opens in a new tab)·IslamQA 225165 (Rules of inheritance: fixed shares, residue, and impediments; opens in a new tab)
• Residue for agnates (asaba), including 2:1 male-to-female splitsSources:Sahih al-Bukhari 6732 (Give the fixed shares; the remainder goes to the closest male relative; opens in a new tab)·Quran 4:11 (Shares of children and parents, after debts and bequests; opens in a new tab)·IslamQA 76418 (Sons and daughters share residue with the male taking twice the female; opens in a new tab)
• Blocking of farther relatives (hajb)Sources:IslamQA 140167 (Order of the estate, heirs, and blocking; opens in a new tab)·IslamQA 106599 (A son blocks the deceased person's siblings; opens in a new tab)
• 'Awl, when fixed shares exceed the estateSources:IslamQA 131556 (Awl reduces every Quranic share in proportion; opens in a new tab)·IslamQA 126233 (Awl example: husband, daughters, and grandmother; opens in a new tab)
• Radd, or remainder to the public treasury, by schoolSources:IslamQA 160948 (Radd versus the public treasury by school; opens in a new tab)
• Grandfather with siblings (Hanafi hajb, or Zayd's method)Sources:IslamQA 175366 (A grandfather stands in for a missing father; a grandmother for a missing mother; opens in a new tab)·IslamQA 140167 (Order of the estate, heirs, and blocking; opens in a new tab)
• Mushtaraka for Maliki and Shafi'i, as this calculator implements that school splitSources:IslamQA 140167 (Order of the estate, heirs, and blocking; opens in a new tab)·Quran 4:12 (Shares of spouses and maternal siblings, after debts and bequests; opens in a new tab)
• Successive death (munasakha) after the first resultSources:IslamQA 127945 (An heir must be alive after the deceased; opens in a new tab)
• Debts and funeral costs before heirsSources:IslamQA 44039 (Funeral costs come from the estate first; opens in a new tab)·IslamQA 200127 (Pay funeral costs, then debts, then the will, then heirs; opens in a new tab)·Quran 4:11 (Shares of children and parents, after debts and bequests; opens in a new tab)
• An optional will, capped at one-third of the net estateSources:Sahih al-Bukhari 2742 (A will may not exceed one-third of the estate; opens in a new tab)·IslamQA 174421 (A bequest is capped at one-third and is not for an heir; opens in a new tab)

Heirs in this version

• Husband, or up to four wivesSources:Quran 4:12 (Shares of spouses and maternal siblings, after debts and bequests; opens in a new tab)·Quran 4:3 (Marriage is limited to four wives; opens in a new tab)
• Father, mother, paternal grandfather, great-grandfather, and both grandmothersSources:Quran 4:11 (Shares of children and parents, after debts and bequests; opens in a new tab)·IslamQA 175366 (A grandfather stands in for a missing father; a grandmother for a missing mother; opens in a new tab)·Sunan Abi Dawud 2894 (The Prophet gave a grandmother one-sixth; opens in a new tab)
• Sons, daughters, grandchildren and great-grandchildren in the son's lineSources:Quran 4:11 (Shares of children and parents, after debts and bequests; opens in a new tab)·IslamQA 131473 (A living son blocks grandchildren in the son's line; opens in a new tab)·Sahih al-Bukhari 6736 (A son's daughter takes one-sixth with one daughter, completing two-thirds; opens in a new tab)
• Daughter's children as distant kindred (except Maliki)Sources:IslamQA 70575 (A daughter's children do not inherit as agnates; opens in a new tab)·IslamQA 135906 (Paternal uncles, blocking, and distant kindred; opens in a new tab)
• Full, paternal half, and maternal siblingsSources:Quran 4:12 (Shares of spouses and maternal siblings, after debts and bequests; opens in a new tab)·Quran 4:176 (Shares of full or paternal siblings in kalalah; opens in a new tab)·IslamQA 166553 (Maternal siblings share equally; full siblings follow 4:176; opens in a new tab)
• Brothers' sons, paternal uncles, and their sonsSources:IslamQA 135906 (Paternal uncles, blocking, and distant kindred; opens in a new tab)·Sahih al-Bukhari 6732 (Give the fixed shares; the remainder goes to the closest male relative; opens in a new tab)

School of law

The first question asks which school you want to follow: Hanafi, Maliki, Shafi'i, or Hanbali. Each choice opens that school's calculator.Sources:IslamQA 140167 (Order of the estate, heirs, and blocking; opens in a new tab)·IslamQA 160948 (Radd versus the public treasury by school; opens in a new tab)

Share numbers follow the school you pick. The Hanafi calculator treats the grandfather like the father. Maliki sends leftover shares to the public treasury. The other schools apply radd, with a Hanafi exception for a lone spouse.Sources:IslamQA 175366 (A grandfather stands in for a missing father; a grandmother for a missing mother; opens in a new tab)·IslamQA 160948 (Radd versus the public treasury by school; opens in a new tab)

What it does not cover

• Unborn child, missing person, killer of the deceasedSources:Jami at-Tirmidhi 2109 (The killer does not inherit; opens in a new tab)·IslamQA 13772 (A killer, or a difference of religion, blocks inheritance; opens in a new tab)·IslamQA 225165 (Rules of inheritance: fixed shares, residue, and impediments; opens in a new tab)
• Difference of religion, apostasy, or disputed parentageSources:Sahih al-Bukhari 6764 (A Muslim and a disbeliever do not inherit from one another; opens in a new tab)·Sahih Muslim 1614 (A Muslim and a disbeliever do not inherit from one another; opens in a new tab)·IslamQA 428 (A Muslim does not inherit from a non-Muslim; opens in a new tab)
• Adoption, foster relations, or intersex casesSources:IslamQA 70575 (A daughter's children do not inherit as agnates; opens in a new tab)·IslamQA 135906 (Paternal uncles, blocking, and distant kindred; opens in a new tab)