The Inheritance Calculator
The Qurʾānic shares of Q. 4:11–12 applied to your specific estate. Computes spouse, children and grandchildren, parents, and full + uterine siblings — with ʿawl, radd, the ʿUmariyya case, and the mother's sibling-reduction. Disputed compositions are routed to a faradi rather than guessed.
Step 1 · The estate
What is the total estate, and what comes off the top?
The Qurʾānic shares apply to the net estate — what remains after burial costs, debts, and any bequests to a non-heir (up to 1/3 of what is left after burial costs and debts).
Total assets: property + retirement fund (beneficiary nomination aside) + cash + investments at fair value
A simple Muslim funeral commonly runs a few thousand; check local costs. See /death-planning
Mortgages, personal debts, unpaid mahr, any zakāt arrears — all settled first
Optional waṣiyya to non-heirs; capped at 1/3 of what is left after funeral costs and debts, per the Sunnah
Step 2 · The heirs
Who survives the deceased?
From the deceased's perspective. Engine assumes a single spouse; multiple wives split the wife's share equally.
Direct biological / adopted-into-mahram sons. Sons take 2× a daughter's share (Q 4:11)
If no sons + 1 daughter: 1/2. If no sons + 2+ daughters: 2/3 shared
Biological father. Gets 1/6 if descendants exist; takes residue otherwise.
Biological mother. Gets 1/6 with descendants; 1/3 without (ʿUmariyya logic applied)
Add grandchildren or siblings (optional)ShowHide
Leave these at zero for the common case. Grandchildren through a son are worked out here only when no children survive (a son blocks them; with a daughter the case goes to a faradi); siblings inherit only when there is no son, grandson, or father (kalālah). Disputed compositions are routed to a faradi rather than guessed.
Son's sons. Step in as agnatic sons only when no child of the deceased survives; with a surviving daughter the case routes to a faradi
Son's daughters. With a surviving daughter the takmilah case routes to a faradi
Same father and mother. ʿAṣabah (residuary) in kalālah; two parts to a sister's one
Same father and mother. 1/2 alone, 2/3 for two-plus; ʿaṣabah with brothers or daughters
Share the mother only. 1/6 one, 1/3 for two-plus shared equally; blocked by any descendant or father
Routed to a faradi — their blocking by full siblings is case-specific
Routed to a faradi — the grandfather–sibling interaction is a classical madhhab dispute
Distribution per Qurʾān 4:11–12
How the A$872,000 estate distributes
Wife
1/8Qurʾān 4:12 · 1/8 of the estate — the deceased husband left descendants
Each
A$109,000
Total
A$109,000
Mother
1/6Qurʾān 4:11 · 1/6 — the deceased left descendants
Each
A$145,333
Total
A$145,333
Son × 2
56.67%Qurʾān 4:11 · Share the residue 2:1 — each son takes two parts to a sister's one
Each
A$247,067
Total
A$494,133
Daughter
14.17%Qurʾān 4:11 · Each takes one part of the residue (a brother takes two)
Each
A$123,533
Total
A$123,533
| Heir | Share | Each | Total |
|---|---|---|---|
Wife Qurʾān 4:12 · 1/8 of the estate — the deceased husband left descendants | 1/8 | A$109,000 | A$109,000 |
Mother Qurʾān 4:11 · 1/6 — the deceased left descendants | 1/6 | A$145,333 | A$145,333 |
Son × 2 Qurʾān 4:11 · Share the residue 2:1 — each son takes two parts to a sister's one | 56.67% | A$247,067 | A$494,133 |
Daughter Qurʾān 4:11 · Each takes one part of the residue (a brother takes two) | 14.17% | A$123,533 | A$123,533 |
| Total distributed | A$872,000 | ||
What this calculator handles · and what it doesn't ↓
This engine handles the common household: one deceased, one surviving spouse, sons + daughters, and parents. It implements the Qurʾānic fixed shares (Q. 4:11–12, 4:176), the standard ʿaṣabah residue rule, ʿawl (proportional reduction), radd (proportional return, Hanafi view excluding spouse), and the ʿUmariyya case (spouse + both parents, no descendants).
This engine does NOT handle — and routes to a qualified faradi: siblings (full / consanguine / uterine — six edge cases), grandparents beyond direct parents, grandchildren via a deceased son (representation), multiple-wife proportional split, distant kindred (dhawūʾl-arḥām), and the named edge cases (Akdariyya, Mushtaraka, Mālikiyya).
Order of distribution from the gross estate: (1) funeral/janāzah costs, (2) outstanding debts including unpaid mahr and zakāt arrears, (3) bequests to non-heirs up to 1/3, (4) the remaining net estate distributes per the Qurʾānic shares. This calculator implements step 4 on the net you supply.
This is not a fatwā. For any non-trivial estate, sit with a faradi or a solicitor specialising in Islamic inheritance. The math here is the right shape; the specific application to your case may have subtleties this engine does not capture.