Per Stirpes Calculator

Calculate branch-based inheritance distribution for estate planning.

What is a Per Stirpes Calculator?

A per stirpes calculator is a specialized financial tool used in estate planning to determine how assets are distributed among descendants. “Per stirpes” is a Latin legal term meaning “by the roots” or “by branch.” When a person passes away, their will or trust often specifies that assets should be distributed per stirpes to ensure that if a primary beneficiary (usually a child) predeceases the grantor, that beneficiary’s share passes directly to their own children (the grandchildren).

Who should use this tool? Anyone drafting a will, heirs trying to understand their inheritance, or executors managing an estate. A common misconception is that per stirpes calculator results are the same as “per capita” results. In per capita, all living members of a generation get an equal share. In per stirpes, the share is preserved within the family branch, regardless of how many people are in that branch.

Per Stirpes Calculator Formula and Mathematical Explanation

The mathematical logic behind a per stirpes calculator follows a hierarchical branching system. The total estate is first divided by the number of primary branches (the children of the deceased), whether they are currently living or deceased.

The step-by-step derivation is as follows:

1. Identify the number of children (N) the deceased had.
2. Calculate the Base Branch Share (S) = Total Estate / N.
3. For each living child, they receive S.
4. For each deceased child, their share S is divided equally among their own children (the grandchildren).
5. If a grandchild is also deceased, their portion of S is divided among their descendants.

Table 1: Variables used in Per Stirpes Calculation

Variable	Meaning	Unit	Typical Range
Total Estate	Total value of assets after debts	Currency ($)	$10,000 – $10M+
N (Branches)	Number of children the deceased had	Count	1 – 10
Status	Whether the branch head is alive	Boolean	Living/Deceased
Descendants	Number of children of a deceased heir	Count	0 – 10

Practical Examples (Real-World Use Cases)

Example 1: The Standard Family Branch

John passes away with an estate of $1,200,000. He had 3 children: Alice, Bob, and Charlie. Alice and Bob are alive. Charlie is deceased but has 2 children (John’s grandchildren). Using the per stirpes calculator:

• Total Branches: 3
• Base Share: $1,200,000 / 3 = $400,000
• Alice: Receives $400,000 (33.3%)
• Bob: Receives $400,000 (33.3%)
• Charlie’s Heirs: The $400,000 is split between his 2 children. Each grandchild receives $200,000 (16.6% each).

Example 2: All Primary Heirs Deceased

Sarah has an estate of $600,000. She had 2 children, Dave and Eve. Both are deceased. Dave had 1 child, and Eve had 3 children. In a per stirpes calculator scenario:

• Total Branches: 2
• Base Share: $600,000 / 2 = $300,000
• Dave’s Branch: His only child receives the full $300,000.
• Eve’s Branch: Her 3 children split her share equally. Each receives $100,000.
• Result: One grandchild gets $300k, while the other three get $100k each.

How to Use This Per Stirpes Calculator

Following these steps will ensure you get accurate results from the per stirpes calculator:

1. Enter Total Estate: Input the net value of the estate after all debts and funeral expenses are paid.
2. Select Number of Children: Choose the number of children the deceased had, including those who may have passed away.
3. Define Status: For each child, toggle the status to “Living” or “Deceased.”
4. Input Descendants: If a child is deceased, enter the number of children they had.
5. Review Results: The per stirpes calculator will instantly update the table and chart to show the exact dollar amount and percentage each heir receives.

Key Factors That Affect Per Stirpes Calculator Results

• State Intestacy Laws: If there is no will, state law determines if “per stirpes” or “per capita at each generation” applies. This per stirpes calculator assumes strict per stirpes rules.
• Wording in the Will: Precise language like “to my descendants, per stirpes” is required to trigger this mathematical logic.
• Outstanding Debts: Estate value must be calculated after taxes and liabilities, as these reduce the total pool for distribution.
• Adopted Children: In most jurisdictions, legally adopted children are treated the same as biological children in per stirpes calculator logic.
• Predeceased Grandchildren: If a grandchild also passes away before the grantor, the per stirpes calculator logic moves down another generation to great-grandchildren.
• Disinheritance: If a child is specifically disinherited in a will, their entire branch may be removed from the per stirpes calculator distribution.

Frequently Asked Questions (FAQ)

What is the difference between per stirpes and per capita?

Per stirpes divides the estate by branch. Per capita (by head) divides the estate equally among all living members of a specific group, regardless of their family branch.

Does a per stirpes calculator include spouses of deceased children?

Generally, no. Per stirpes follows the bloodline (or legal descendants). Spouses of deceased children are typically not included unless specifically mentioned in the will.

What happens if a deceased child has no children?

If a branch head is deceased and has no descendants, that branch is usually eliminated, and the estate is divided among the remaining branches.

Is per stirpes the default rule?

It varies by state. Many states use a variation called “per capita at each generation” for intestate succession (no will), which is why using a per stirpes calculator is vital for planning.

Does this calculator handle debts?

No, you should enter the “Net Estate Value” after all debts and taxes have been subtracted.

Can I use per stirpes for siblings instead of children?

Yes, the per stirpes calculator logic works for any group of heirs (like siblings and their children/nieces/nephews) if the legal document specifies it.

What if the estate is not cash?

The per stirpes calculator works on the total value. Physical assets like houses or jewelry are usually appraised and their value added to the total.

Does this calculator account for inheritance tax?

Inheritance tax is calculated differently based on the recipient’s relationship and state. This tool calculates the pre-tax distribution amounts.