Son vs Daughter Inheritance in Islam: The 2:1 Ratio Explained
When a son and daughter inherit together, the son receives twice the daughter's share: this is the 2:1 ratio from Surah An-Nisa 4:11. But that ratio only applies to this exact combination. A lone daughter with no son receives a fixed 1/2. Two or more daughters with no son share a fixed 2/3 collectively. Neither figure is "half of what a son would have got"; each is its own separate Quranic rule.
Where the 2:1 Ratio Comes From
The rule comes directly from the Quran, not from scholarly custom or cultural practice. Surah An-Nisa 4:11 states the principle in the clearest possible terms:
يُوصِيكُمُ ٱللَّهُ فِىٓ أَوْلَـٰدِكُمْ ۖ لِلذَّكَرِ مِثْلُ حَظِّ ٱلْأُنثَيَيْنِ
"Allah instructs you concerning your children: for the male, what is equal to the share of two females." (Surah An-Nisa 4:11)
This single sentence is the entire basis for the 2:1 ratio. It applies specifically to the relationship between a son and a daughter inheriting together, not to every male and female heir on an estate (a husband and wife, for example, follow a completely different set of fractions). For the full verse-by-verse breakdown of 4:11, 4:12 and 4:176, see our Surah An-Nisa inheritance guide.
What the Ratio Means in Real Numbers
"For the male, the share of two females" means the estate portion available to the children is split into units: each son counts as 2 units, each daughter as 1 unit, and the total is divided accordingly.
| Heirs | Units | Son's share | Daughter's share |
|---|---|---|---|
| 1 son, 1 daughter | 3 (2+1) | 2/3 | 1/3 |
So on a R900,000 portion available to the children, R900,000 ÷ 3 units = R300,000 per unit. The son (2 units) receives R600,000, exactly twice the daughter's R300,000, per Surah An-Nisa 4:11. The daughter (1 unit) receives R300,000.
It's Not Always 2:1: Here's the Part Usually Left Out
The phrase "a son gets twice a daughter's share" gets repeated as if it were a universal formula. It isn't. It's the rule for exactly one situation: a son and daughter inheriting together. Remove the son from the picture and the daughter's share isn't calculated as "half of whatever the son would have received". She has her own, separate, fixed Quranic share:
- One daughter, no son: a fixed 1/2 of the estate.
- Two or more daughters, no son: a fixed 2/3 of the estate, shared equally between them.
Both of those numbers come from the same verse (4:11) as the 2:1 ratio; they aren't derived from it. A son, in turn, has no fixed fraction of his own at all: he's a residuary (Asabah) heir who takes whatever remains once every fixed-share heir has been paid, which is exactly why his presence is what triggers the 2:1 split in the first place. For every scenario specific to one heir, including how each interacts with parents, a spouse, and grandchildren, see the full Daughter's Share and Son's Share guides.
Worked Examples: Every Son + Daughter Combination
Assume a net estate portion of R840,000 available to the children, with no other heirs affecting that portion (see the section below for what changes when parents or a spouse also survive).
| Children | Total units | Each son gets | Each daughter gets |
|---|---|---|---|
| 1 son, 1 daughter | 3 | R560,000 | R280,000 |
| 1 son, 2 daughters | 4 | R420,000 | R210,000 |
| 2 sons, 1 daughter | 5 | R336,000 | R168,000 |
| 2 sons, 2 daughters | 6 | R280,000 | R140,000 |
| 1 son, 3 daughters | 5 | R336,000 | R168,000 |
| 3 sons, 1 daughter | 7 | R240,000 | R120,000 |
The pattern holds regardless of how many sons or daughters are involved: count 2 units per son and 1 unit per daughter, add them up, and divide the available portion by the total. Each son's individual amount is always exactly double each daughter's individual amount. It's never double the combined total of all daughters.
Calculate Your Own Family's Shares
Enter your actual heirs, including any spouse, parents or other relatives, and the calculator applies the 2:1 ratio and every fixed share automatically.
Calculate Now →Why the Ratio Exists
The 2:1 ratio is often read as a statement about worth, as though the Quran values a son more than a daughter. That isn't the reasoning Islamic scholarship gives for it. The ratio sits inside a wider system of financial obligations, not a standalone judgement:
- A daughter keeps her Mahr (dowry) entirely for herself, and her husband is obligated to maintain her financially: housing, food, and other needs are his responsibility, not hers.
- A son, by contrast, is the one obligated to pay Mahr and to financially maintain his own wife and children, often drawing on the same wealth he inherited.
Measured across the full financial system rather than the inheritance line alone, a daughter's inheritance is money she keeps outright with no offsetting obligation attached to it, while a son's larger share comes with a larger set of financial responsibilities attached. See our Daughter's Share guide for the fuller picture of this financial framework.
When Parents or a Spouse Are Also Heirs
Every example above assumes the children are dividing the whole estate between themselves. In a real estate, surviving spouses and parents usually take their own fixed shares first: a wife's 1/8 (or 1/4 with no children), a husband's 1/4 (or 1/2 with no children), a mother's 1/6, a father's 1/6 plus residue. Only what's left afterward is what the sons and daughters split 2:1. The children's own ratio to each other never changes; only the size of the portion they're dividing does. For the complete list of fixed shares and a full worked example with parents and a spouse included, see What is Faraid?
The Prophet ﷺ was explicit that these prescribed shares are not something families negotiate around: "Give the Fara'id [the shares prescribed in the Quran] to those who are entitled to receive it. Whatever remains should be given to the closest male relative of the deceased." (Sahih al-Bukhari 6732, also reported in Sahih Muslim 1615b)