Islamic Inheritance Law Calculator

An advanced tool to accurately distribute an estate according to the principles of Islamic Sharia.

Estate & Pre-Inheritance Deductions

Surviving Heirs

Distribution Summary

Shares will be calculated and shown here.

What is an Islamic Inheritance Law Calculator?

An Islamic inheritance law calculator is a specialized digital tool designed to simplify the complex process of distributing a deceased Muslim’s assets in accordance with Sharia law. This field of jurisprudence, known as ‘Ilm al-Farā’iḍ’ (the science of the ordained quotas), provides a divine framework for ensuring wealth is divided justly among the rightful heirs. Unlike a conventional will that allows for arbitrary distribution, Islamic law specifies fixed shares for primary heirs. This calculator automates these calculations, considering variables like surviving relatives, debts, and bequests to provide an accurate breakdown of the estate.

The Islamic Inheritance Formula and Explanation

There isn’t a single algebraic formula for Islamic inheritance, but rather a clear, multi-step process mandated by the Qur’an and Sunnah. The procedure ensures that obligations are met before wealth is distributed to the family.

1. Payment of Funeral Expenses: The first charge against the estate is the cost of a modest and proper burial.
2. Payment of Debts: All outstanding debts of the deceased must be settled, including financial obligations to individuals, institutions, and any unpaid religious dues (like Zakat).
3. Execution of the Will (Wasiyyah): The deceased may bequeath up to one-third (1/3) of the remaining estate to non-heirs. This bequest cannot be made to an individual who is already a designated heir under Sharia.
4. Distribution to Heirs: The final remaining estate is distributed among the entitled heirs according to their prescribed shares.

Primary Heir Shares (Ashab al-Furud)

The primary heirs are those with fixed shares mentioned explicitly in the Qur’an (Surah An-Nisa, 4:11-12). The shares can vary based on the presence of other heirs.

Key Variable Shares for Heirs

Heir	Condition	Share	Unit
Husband	Deceased wife has no children	1/2	Fraction of Estate
Husband	Deceased wife has children	1/4	Fraction of Estate
Wife	Deceased husband has no children	1/4	Fraction of Estate
Wife	Deceased husband has children	1/8	Fraction of Estate
Daughter (one)	No sons	1/2	Fraction of Estate
Daughters (two or more)	No sons	2/3 (shared)	Fraction of Estate
Son & Daughter(s)	Together	Male receives 2x Female (Asaba)	Ratio
Mother	Deceased has children or siblings	1/6	Fraction of Estate
Mother	Deceased has no children or siblings	1/3	Fraction of Estate
Father	Deceased has children (son/grandson)	1/6	Fraction of Estate

Practical Examples of the Islamic Inheritance Law Calculator

Example 1: Man leaves behind a wife, son, and daughter

Inputs:

• Total Estate: $400,000
• Debts: $20,000
• Funeral Costs: $5,000
• Bequest: $10,000
• Heirs: Wife, 1 Son, 1 Daughter

Results:

• Net Estate for Inheritance: $365,000
• Wife’s Share (1/8): $45,625
• Remaining for Children: $319,375
• Son’s Share (2/3 of remainder): $212,916.67
• Daughter’s Share (1/3 of remainder): $106,458.33

Example 2: Woman leaves behind a husband and parents

Inputs:

• Total Estate: $250,000
• Debts: $0
• Funeral Costs: $5,000
• Bequest: $0
• Heirs: Husband, Mother, Father

Results:

• Net Estate for Inheritance: $245,000
• Husband’s Share (1/2): $122,500
• Mother’s Share (1/3 of remaining): $40,833.33
• Father’s Share (Asaba – remainder): $81,666.67

How to Use This Islamic Inheritance Law Calculator

Using this calculator is a straightforward process to ensure you get an accurate distribution of assets.

1. Select Gender: First, choose whether the deceased person was male or female, as this affects spousal shares.
2. Enter Estate Value: Input the total monetary value of all assets left behind.
3. Input Deductions: Enter any funeral costs, outstanding debts, and bequests. The calculator will automatically cap the bequest at 1/3 of the net estate after debts.
4. Select Heirs: Check the boxes for the surviving primary heirs (Spouse, Mother, Father) and enter the number of sons and daughters. This tool focuses on the most common scenarios.
5. Review the Results: The calculator will instantly display the net estate available for inheritance and the specific share amount for each heir. The visual chart helps in understanding the distribution proportions.

Key Factors That Affect Islamic Inheritance

The distribution of an estate is not static; it is highly dependent on the composition of the surviving family. Here are key factors that significantly alter the outcome:

• Presence of a Son: The existence of a son transforms many female relatives (like daughters and sisters) into ‘Asaba’ (residuary heirs), where they inherit in a 2:1 ratio with their male counterparts, rather than taking a fixed share.
• Existence of Children: The share of the surviving spouse is directly impacted by whether the deceased had any children. A wife’s share reduces from 1/4 to 1/8, and a husband’s from 1/2 to 1/4.
• Number of Daughters: A single daughter with no sons receives a 1/2 share. However, two or more daughters collectively share 2/3 of the estate.
• Presence of Parents: The father and mother each have prescribed shares (typically 1/6 each if the deceased has children), but the father can also inherit as a residuary heir if no sons are present.
• Debts and Bequests: These pre-inheritance deductions reduce the total pot available for heirs. A large debt can significantly diminish or even exhaust the estate.
• Exclusion Rules (‘Hajb’): Certain heirs can “block” or “exclude” others. For example, a son excludes brothers and sisters from inheriting. The father excludes the grandfather. These rules create a clear hierarchy of entitlement.

Frequently Asked Questions (FAQ)

1. What happens if there are no sons, only daughters?

If there is one daughter, she receives a fixed share of 1/2. If there are two or more daughters, they collectively receive 2/3 of the estate to share equally. The remainder is distributed to other heirs like parents or spouses.

2. Can a person give away all their property in a will (Wasiyyah)?

No. In Islamic law, the Wasiyyah is limited to a maximum of one-third of the net estate after debts are paid. Additionally, it cannot be made to an heir who already has a prescribed share unless all other heirs agree.

3. Does this calculator handle all possible relatives?

This islamic inheritance law calculator focuses on the most common primary heirs (spouse, children, parents) for simplicity and clarity. The full law of Mirath includes many other relatives like grandparents, siblings, uncles, and nephews, whose shares are conditional. For complex cases, consulting a scholar is recommended.

4. What is the difference between a Quranic heir (Ashab al-Furud) and a Residuary heir (Asaba)?

Quranic heirs are those with fixed fractional shares mentioned in the Qur’an (e.g., wife gets 1/8). Residuary heirs inherit what is left after the Quranic heirs have taken their shares. The son is a primary example of a residuary heir.

5. Do adopted or step-children inherit?

No, under traditional Islamic law, adopted children, step-children, and illegitimate children do not have automatic inheritance rights. However, they can receive a gift from the Wasiyyah (bequest) up to the 1/3 limit.

6. Why do sons inherit twice the share of daughters?

This rule reflects the differing financial responsibilities placed upon men in an Islamic social structure. Men are obligated to provide for the financial maintenance of their wives, children, and other female relatives, while a woman’s wealth is entirely her own, with no obligation to spend it on the family.

7. Can a non-Muslim relative inherit?

Generally, non-Muslims do not inherit from a Muslim’s estate under Sharia law. However, they can be beneficiaries of the Wasiyyah (bequest).

8. What is the unit for calculation?

The calculator is unit-agnostic. You can enter the estate value in any currency (e.g., USD, EUR, GBP) or even other units like acres of land. The output will be in the same unit you provided.