Equal split
Works well when your incomes are similar or when you want simple, transparent rules. You do not need to track who earns what — you have one clear rule you both agree on.
Calculator for couples
See whether 50/50 is fair.
Enter your incomes and shared expenses. The calculator shows equal, income-based, and custom percentage splits — no signup and no data sent.
Calculations happen only in your browser · no data is sent
Enter the numbers — the rest calculates itself.
Income and expenses are the starting point. The calculator shows how each split method works in dollars.
Ready-made examples — click to fill the form
Result for your example
Live
Equal split (50/50)
Emma
—
Jake
—
Income-based
Emma
—
Jake
—
Custom split
Emma
—
Jake
—
The calculator does not tell you what is right. It shows the numbers so it is easier to discuss the rules.
Want to save this split and settle real expenses every month?
How to choose a split
When 50/50 makes sense — and when proportions are better.
Income-based
A popular choice when incomes differ a lot. Each person contributes a similar percentage of their income to shared costs, so nobody gives up a disproportionate share of their budget. The calculator does this automatically.
Custom percentage
Useful when you have your own agreement that does not come directly from income — for example, one person has extra obligations. The slider lets you set any split and see the dollar result instantly.
What next?
The calculator is a good start.
If you want to settle real expenses instead of examples, the app gives you a simple way to do it.
Blog
Money in relationships
Articles about shared budgets, cost splitting, and money conversations as a couple.
Read more about money in relationships → DemoSee the app in action
Open a sample settlement without signing up. Sample data, real mechanics.
View app demo → LITE account · freeStart with the free plan
Up to 10 expenses per month, no card required. See whether it solves your problem.
Create a LITE account →Questions and answers
Frequently asked questions
Is 50/50 fair in a relationship?
It depends on your situation. With similar incomes, 50/50 is simple and clear: one rule, no recalculating. If you earn very different amounts, some couples prefer an income-based split because each person contributes a similar share of their income to shared costs. There is no single right answer — the calculator shows the numbers so it is easier to agree on rules together.
How do you split costs with different incomes?
The simplest method: add both incomes and calculate what share of the total each person earns. Then multiply that share by shared expenses. Example: Emma earns $4,200 and Jake earns $7,800 — $12,000 together. Emma’s share is 35%, so with $3,200 of shared expenses, her part is $1,120. The calculator above does this automatically after you enter incomes.
Does the calculator save my data?
No. All calculations happen only in your browser. No numbers or names are sent to a server or stored anywhere. You can enter fictional values and the calculator will still work correctly.
Do we need a joint account?
No. CoupleBud is made for couples with separate accounts. The app shows who pays whom at the end of the month to even out shared costs. Each person pays from their own account, with no bank connection.
How is the calculator different from CoupleBud?
The calculator is a one-time tool for checking a split for specific numbers — you enter incomes and see the result. The app works all month: you add real expenses, sync them with your partner, and get one simple summary at the end showing who pays whom. It is a deeper level of tracking.
Want to settle real expenses, not just an example?
CoupleBud syncs both partners’ expenses and shows one simple monthly settlement — who pays whom.