Co-Parenting Expense Calculator
Splitting 50/50 when one parent earns three times more isn't fair — it just feels simple. This calculator splits child expenses proportionally by income, by custody time, or a hybrid that weighs both. Plug in education, medical, childcare, and activity costs to get a clear number each parent owes, so the conversation stays about the kids and not the math.
Co-parents typically split child expenses proportionally to income. If Parent A earns $6,000/month and Parent B earns $4,000/month, Parent A pays 60% of shared expenses like education, healthcare, and activities. Enter both incomes and expenses below for a fair breakdown.
Parents
Parent 1 has 50% custody time
Child Expenses
Split Method
Each parent pays proportionally to their income. Higher earner pays more.
How This Calculator Works
Enter Your Details
Fill in amounts, people, and preferences. Takes under 30 seconds.
Get Fair Results
See an instant breakdown with data-driven calculations and Fairness Scores.
Share & Settle
Copy a shareable link to discuss results with everyone involved.
Frequently Asked Questions
People Also Calculate
Child Support
Child support is typically 17% of income for one child, 25% for two. Estimate payments using income shares, percentage, or Melson models.
Parenting Time
Every-other-weekend plus one weeknight equals 104 overnights — a 71/29 split, not 50/50. See exact custody percentages for any schedule.
Divorce Assets
A $542,000 marital estate with $207,000 in debts leaves $335,000 to divide. See exactly how assets and debts split under your state's rules — 50/50 or equitable.
Nanny Share
A nanny share cuts childcare costs 25-40% per family. Calculate each family's share by number of children and see your annual savings vs. hiring solo.
Debt Split
Split debt in a divorce or breakup — credit cards, loans, and mortgages. Divide equally, by account holder, or proportional to income with a clear breakdown.
Percentage Split
Split any dollar amount by custom percentages — 50/30/20, 70/30, or any custom split. Supports 2 to 20 shares with exact amounts and remainders.
Baby Cost
A baby costs $12,000-18,000/year before childcare. Add daycare at $1,200-2,500/month and year one can top $30,000. Budget every category here.
Uneven Split
Splitting a $240 dinner evenly when you had a salad? Stop subsidizing someone else's steak. Split by what each person actually ordered, with tax and tip distributed proportionally.
Wedding Split
The average U.S. wedding costs $33,000. Split expenses between families and the couple using traditional, modern 50/50, or income-based methods.
Related Guide
The Complete Guide to Fair Division
Income-proportional splits for childcare, education, and medical costs between co-parents.