Roommate Rent Split Calculator

There is no single right answer, which is why four methods are offered. Equal shares is simplest, room size rewards whoever took the small room, and income splits by ability to pay. Agreeing the basis before moving in matters more than which one wins.

It is the most common alternative to equal shares and it works well where rooms differ substantially. Pure floor area ignores natural light, storage, noise and whether a room has an en suite, so a weighting adjustment is often added.

It is defensible and it requires everyone to disclose what they earn, which many people are not willing to do. It also means a pay rise raises your rent, which changes the incentives in a way not everyone anticipates.

Most methods split shared space equally and only differentiate on bedrooms. A common approach is to split half the rent equally and half by room size, which balances the two.

Agree it in advance, because it is the most reliable source of housemate conflict. Common approaches are a fixed contribution above a threshold number of nights, or a share of utilities only.

The named tenant carries legal liability for the whole rent, which is a real risk rather than a formality. Some houses recognise it with a small discount; most do not, and it is worth discussing openly.

Usually equally, since utilities are shared regardless of room size. Some houses split standing charges equally and usage by headcount, which is fairer where one person is away often.

One where every tenant is liable for the whole rent, not just their share. If someone leaves without paying, the others owe it. It is the standard form in many places and it is worth understanding before signing.

Agree in advance who finds a replacement and what happens if nobody is found. Without an agreement the remaining tenants often carry the whole rent, which is the most common shared-house financial disaster.

Two people in one room use more of the shared space and utilities than one. A common compromise is that the room pays a room-based share of rent and the household splits bills by headcount.

In the same proportion as the rent, and record it in writing at the start. Deposits are returned as a lump sum to whoever paid, which creates a dispute at exactly the point everyone is moving out.

Floor area alone misses light, noise, storage and en suites. A common approach is to start from area and let the house apply an agreed adjustment, which is more honest than pretending a formula can capture it.