Split Flatmate Costs Fairly

The fairest method is splitting by room size: everyone pays proportionally to their room's area. Common areas (kitchen, bathroom, hallway) are split equally. Our calculator does this automatically.

Utility costs include heating, water, waste disposal, caretaker, and insurance. They're typically split equally since consumption in shared spaces can't be measured individually.

The broadcasting fee (EUR 18.36/month) is charged per household, not per person. In a shared flat, it's typically split equally. Officially, the person who registered is liable.

The annual settlement compares advance payments with actual costs. The additional payment or credit is split among everyone who lived there during the billing period — proportionally by months.

When moving out, utility costs are calculated proportionally. The departing flatmate only pays for the months they actually lived there. Outstanding expenses should be settled beforehand.

No! Equal splitting is only fair when all rooms are the same size and equally attractive. With different room sizes, splitting by square metres is more equitable.

Best practice is to collect all expenses over a period (e.g., one month) and then settle up. Our Settle Up tab does exactly that: everyone enters what they paid, and the calculator determines the minimum number of transfers.

Popular apps include Splitwise, Tricount, and Flatastic. Our roommate calculator offers a free alternative right in the browser — no registration, no data storage.

Clear rules from the start: rent by room size, utilities equally, regular settlement of shared expenses. Transparency and a fixed settlement system prevent 90% of conflicts.

Partially: craftsman services and household services (e.g., stairwell cleaning) can be partially deducted. Rent itself isn't deductible for private individuals, except for a home office.