Shared Expenses Calculator for Couples
Calculate how you and your partner can share monthly expenses using a 50/50, income-based, or custom split
See how much you and your partner would each contribute to your monthly shared expenses. Choose a 50/50, income-based, or custom split, then enter your shared costs to see the result.
How the Shared Expenses Calculator Works
1. Choose how to split your expenses
Pick the method that works best for you:
50/50: You each pay half of the shared expenses.
By income: Each person contributes to shared expenses in proportion to their share of the combined household income.
Custom percentage: Choose your own split, such as 60/40 or 70/30.
2. Enter your monthly shared expenses
Enter the costs you both contribute toward, such as bills, groceries, dining, transport, subscriptions and insurance.
Leave any category you don't share at €0.
Tip: By default, every expense follows the split you selected in Step 1. To use a different split for a specific expense, select “Customize split” below that expense.
3. See each person's contribution
The calculator applies your chosen split to your total monthly shared expenses and shows how much each person contributes.
Tip: You can also view the breakdown to see how each expense is divided.
How Your Share Is Calculated
For a 50/50 or custom split, the calculation is straightforward: your share of the total is determined by the percentage you selected.
For an income-based split, your share is calculated from your monthly take-home income relative to your combined household income.
Income share = individual monthly take-home income ÷ combined monthly take-home income
Shared-expense contribution = income share × total monthly shared expenses
For example, if you earn €1,800 and your partner earns €1,200, your combined monthly income is €3,000. Your income share is 60%, so you would pay 60% of the shared expenses.
What counts as shared expenses?
Shared expenses are costs that you and your partner have agreed to contribute toward. These may include household bills, groceries, subscriptions, dining out, transportation, and other costs you regularly share.
Only include expenses you’ve agreed to share. If you’re unsure what should be included, read our guide to shared expenses.
What if one person earns more?
Your contributions don't have to be equal when your incomes aren't equal. An income-based split allows each person to contribute according to their share of the combined household income.
For example, if you earn 65% of the combined income, you would contribute 65% of the shared expenses.
This can be a useful approach when you want the cost of shared expenses to reflect each person's ability to contribute.
Learn more about splitting shared expenses based on income.
Example Calculation
Let's say you earn €3,200 per month and your partner earns €2,400. Your combined income is €5,600, so you earn about 57.1% of the household income and your partner earns about 42.9%.
Your monthly shared expenses are:
| Shared Expense | Monthly Cost (€) | You | Your Partner |
|---|---|---|---|
| Electricity | €90 | €51.43 | €38.57 |
| Gas | €60 | €34.29 | €25.71 |
| Water | €35 | €20.00 | €15.00 |
| Internet | €40 | €22.86 | €17.14 |
| Household | €75 | €42.86 | €32.14 |
| Groceries | €500 | €285.71 | €214.29 |
| Eating Out | €180 | €102.86 | €77.14 |
| Transport | €160 | €91.43 | €68.57 |
| Subscriptions | €45 | €25.71 | €19.29 |
| Insurance | €80 | €45.71 | €34.29 |
| Other Shared Expenses | €135 | €77.14 | €57.86 |
| Total | €1,400 |
€800 57.1% |
€600 42.9% |
50/50: €700 each
By income: €800 for you, €600 for your partner
If rent is one of your main shared costs, learn how to split rent fairly.
Choosing a Shared Expense Split
There’s no single split that works for every couple. The right approach depends on your incomes, preferences, and what feels fair to both of you.
50/50 — A straightforward option when you want to contribute equally.
By income — Useful when you want contributions to reflect each person's share of household income.
Custom percentage — Ideal when you and your partner have agreed on a specific split.
The best split is one that feels fair, works with your finances, and is easy for both of you to maintain.
Compare 50/50 vs proportional splitting to see how the two approaches differ.
Know the split. Stop chasing the balance.
Once you’ve worked out how much you each want to contribute, you shouldn’t have to keep track of it every time you spend.
Partly gives couples a shared wallet for the things you do together, while keeping track of what belongs to each of you. You can both spend from the same balance without settling up after every dinner, grocery shop or subscription — and when it’s time to top up, you can see whether things are still fair and rebalance if you want to.
Share the spending, without having to merge your finances.
Be among the first couples to try it!
Frequently Asked Questions
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Enter your monthly take-home income, choose how you'd like to split expenses, and add your shared monthly costs. The calculator then shows how much each person would contribute.
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For an income-based split, you'll need both partners' monthly take-home incomes. You'll also need an estimate of your monthly shared expenses. For 50/50 or custom percentages, you don't need to enter income.
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Yes. Select 50/50 and the calculator divides your total shared expenses equally between you and your partner.
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Yes. Select Custom percentage to decide how you'd like to divide the expenses, such as 60/40 or 70/30.
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No. Your numbers are calculated in your browser and aren't saved.
Conclusion
Use the calculator to see how your shared expenses would look under a 50/50, income-based or custom split. Comparing the options can give you a clearer starting point for deciding what feels fair and manageable for both of you.