Free bill split calculator — split bills fairly | plan/ria
This is a free bill split calculator for couples, partners, and flatmates in the UK. Compare equal (50/50) splits with income-based splits for rent, bills, or any shared cost. No signup required, and no personal financial data is required to use this tool.
Free Tool
Fair Split Calculator
Calculate fair expense splits instantly. Compare equal splits vs income-based splits to see what works best for your relationship.
No signup required
Instant results
Compare methods
How It Works
1
Enter Your Incomes
Add both partners' monthly income to calculate the fair ratio.2
Add Your Expenses
Enter your shared monthly expenses like rent, utilities, and groceries.3
See Both Methods
Compare equal splits vs income-based splits side by side.4
Choose What Feels Right
Decide which method works best for your relationship.Your Split
Split Results
Enter your expense details and click Calculate to see the results.
Beyond the numbers
Fair splits are one part of shared money. Many households start with one shared bill or category, then expand as trust builds. That is the idea behind progressive transparency: you choose what to share first and widen only when it feels right.
plan/ria is built for that path—clear split rules, less spreadsheet reconciling, and room to deepen visibility together over time.
Frequently asked questions
Is 50/50 always fair when incomes differ?
Not necessarily. A 50/50 split is simple, but when one person earns significantly more, an income-based (proportional) split can reflect each person’s ability to pay. Many households use a mix: proportional for larger costs like rent, and equal splits for smaller shared expenses.Do I need an account to use this calculator?
No. You can use the fair split calculator in your browser without signing up. It is a free tool to help you compare split methods before you commit to an approach with your partner or flatmates.Is my financial information stored or sent to plan/ria?
No personal financial data is required to use this tool. You enter numbers locally in your browser to see illustrative results; we do not ask you to connect a bank account or submit those figures to our servers for this calculator.How does this relate to the relationship money quiz?
The quiz helps you see where you are with shared money as a couple or household. The calculator turns a chosen approach (equal vs income-based) into concrete amounts. Together they support a practical conversation without judgement.Related Resources
Relationship money quiz
How to Split Rent Fairly
FAQ
Pricing Plans
Ready for less time reconciling?
This calculator is a starting point. plan/ria automates fair splits, keeps shared expenses in one place, and lets you deepen transparency at your own pace—from flatmates to long-term partners.
Early access members receive three months free at launch.