Prenuptial Asset Calculator

Analyze separate vs marital property to determine prenuptial agreement value.

Legal Disclaimer

This calculator provides general estimates only and does not constitute legal advice. Laws, regulations, and court procedures vary significantly by jurisdiction. Consult a licensed attorney in your area for advice specific to your situation.

Inputs

Spouse 1 Pre-Marital Assets

Spouse 2 Pre-Marital Assets

Spouse 1 Expected Inheritance

Spouse 2 Expected Inheritance

Spouse 1 Business Value

Spouse 2 Business Value

Prenup Legal Cost

Tab to move between fields

Results

Total Protected Assets

$1,100,000.00

≈ 3 average U.S. homes

Cost-Benefit Ratio

220x

Spouse 1 Separate Assets$1,000,000.00

Spouse 2 Separate Assets$100,000.00

Asset Difference$900,000.00

Higher Spouse Share90.9%

How to Use This Calculator

Enter Spouse 1 and Spouse 2 Pre-Marital Assets — assets owned before marriage that you want to protect.
Set Expected Inheritance amounts for each spouse.
Enter Business Value for any pre-existing businesses to be ring-fenced from marital estate.
Set Legal Cost Estimate for attorney fees to draft the prenup.
Review Total Protected Assets — the aggregate value excluded from the marital estate.
Both parties must have independent legal counsel for a prenup to be enforceable in most jurisdictions.

How the result changes with Spouse 1 Pre-Marital Assets

Spouse 1 Pre-Marital Assets	Total Protected Assets	Cost-Benefit Ratio
$5,000,000.00	$5,600,000.00	1,120x
$17,500,000.00	$18,100,000.00	3,620x
$32,500,000.00	$33,100,000.00	6,620x
$45,000,000.00	$45,600,000.00	9,120x

What each input means

Spouse 1 Pre-Marital Assets: Value of Spouse 1's assets before marriage.
Spouse 2 Pre-Marital Assets: Value of Spouse 2's assets before marriage.
Spouse 1 Expected Inheritance: Expected inheritance Spouse 1 wants to protect.
Spouse 2 Expected Inheritance: Expected inheritance Spouse 2 wants to protect.
Spouse 1 Business Value: Value of Spouse 1's pre-existing business.
Spouse 2 Business Value: Value of Spouse 2's pre-existing business.
Prenup Legal Cost: Estimated attorney cost to draft the prenup.

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Spouse 1 Pre-Marital Assets = 500000, Spouse 2 Pre-Marital Assets = 100000, Spouse 1 Expected Inheritance = 200000, Spouse 2 Expected Inheritance = 0 = 7 input(s) provided
Calculate Total Protected Assets
Total Protected Assets
1100000 = $1,100,000
Calculate Cost-Benefit Ratio
Cost-Benefit Ratio
220 = 220
Calculate Spouse 1 Separate Assets
Spouse 1 Separate Assets
1000000 = $1,000,000
Calculate Spouse 2 Separate Assets
Spouse 2 Separate Assets
100000 = $100,000