How to Calculate the Share of Each Heir in an Islamic Estate
A man passes away leaving a wife, sons, daughters, and his own father still alive. Everyone in the family knows they have some claim on the estate — nobody is sure exactly how much, or whether the father gets anything at all when there are grown sons, or how these shares are meant to be written down for a bank or a court. The problem is not doubt that a right exists; it is not knowing its exact number.
What the calculator does, and why it helps
An inheritance calculator works differently from an ordinary split calculator: you never type in a ready-made percentage. You only mark who survived — a spouse, sons and daughters, the parents, and further relatives if none closer exist. From that selection alone, the tool works out the base of the case (aṣl al-masʾala) and the shares out of it, showing each heir a precise fraction and, if you enter the estate value, an amount — in the same form a court document writes it.
The real value is not just the final number, it is seeing clearly who was excluded and by whom. A lot of family confusion comes from assuming every relative on the list has a fixed share regardless of who else is present, when in fact a closer heir can exclude a more distant one from a share they would otherwise have had alone. The calculator states this exclusion openly instead of a family discovering it late, at the point of actually dividing the money.
Fixed shares, residuary heirs, ʿawl, radd, and the two ʿUmariyya cases
The tool distinguishes two kinds of entitlement: heirs with a fixed share set in advance by their relationship, such as a spouse or a parent in certain configurations, and residuary heirs, who take whatever remains after the fixed shares are paid — which can be large, small, or nothing at all, depending on who else survived. It also handles ʿawl, where the fixed shares together exceed the whole estate and every share is scaled down proportionally, and radd, where part of the estate is left over with no residuary heir to claim it and it returns to the fixed-share holders — plus the two cases known as al-ʿUmariyyatayn, which have a settled, agreed resolution.
Where the calculator stops on purpose
Certain combinations of heirs — particularly some grandparents alongside some siblings when the father is absent — are cases the schools of Islamic jurisprudence genuinely disagree on, with no single answer everyone accepts. The calculator does not silently pick one opinion for you. It stops openly at that case and flags it, because choosing a legal position without telling the user could lead to a financial or legal decision built on the wrong assumption.
Steps to use it
- Open the inheritance calculator and mark who among the core heirs survived: spouse or spouses, sons and daughters, father and mother.
- If none of those survived, add the next relatives — siblings or grandparents — so the tool can recognise who the entitlement moves to.
- Enter the net estate value if you want actual amounts, or leave it blank to see shares as fractions only.
- Review the result: the base of the case, each heir's share, and any exclusion the tool found.
- If a disputed case is flagged, stop there and check with a qualified specialist before treating any number as final.
A real case
A woman dies leaving her husband, one son, and two daughters, while her own father is still alive. One relative assumed the estate would simply be split among the three children and the husband, forgetting that her father is still living and holds an independent share that does not disappear just because his grandchildren exist. Entering the actual list — husband, son, two daughters, father — into the calculator showed all four shares together at once, revealing that dividing the joint bank account by informal family agreement would have left the father's share out entirely.
This is a common pattern: families know who is alive, but not that every additional relative on the list can change everyone else's share, not just their own. It is worth entering the full list in one pass rather than testing heirs one at a time.
Frequently asked
Can the calculator's result be used officially in court?
It shows the shares in the same structure a court document uses — the base of the case and the shares out of it — which makes it a fast way to understand and prepare. Formal approval of an estate still goes through a court or a qualified body that reviews the full file of heirs and assets.
What is the difference between a fixed share and a residuary share?
A fixed-share heir has an amount set in advance by their relationship and who else is present. A residuary heir takes whatever is left after the fixed shares are paid, and that amount can grow, shrink, or disappear entirely depending on who else survived.
What happens if the shares add up to more than the whole estate?
That is ʿawl, and the calculator handles it automatically by scaling every share down proportionally so the total matches the estate, without changing who is entitled and who is not.
Does the calculator also work out zakat on the estate?
No, it only divides the shares. To work out zakat due on your own share once you receive it, use the zakat calculator separately.
What if the heirs disagree with the result?
Check the entered data first — who was marked as excluded is the most common source of disagreement — then bring the full list to a qualified specialist or a personal-status court for final approval.
Try the tool
Open the inheritance calculator, mark the heirs exactly as they stand, and get the base of the case and every heir's share ready to review before the actual division.