This calculator fairly splits rent and shared bills between flatmates, including an option to charge a little extra for the larger room rather than splitting everything equally. You enter the total rent, the shared bills, the number of flatmates and any premium for the main room, and it shows what each person pays, helping flats avoid the awkward disputes that come from a vague or unfair split.
The premium for the main room is added to that person rent share, with the rest of the rent split equally among everyone, and bills split equally. Set the premium to zero for a fully equal split. Agree the split in advance and write it down.
The calculator takes the premium for the main room off the rent, splits the remaining rent equally among all flatmates, then adds the premium back to the main room occupant. Shared bills are split equally on top. The result is a fair weekly figure for the main room and for everyone else, which is easy to show the flat so nobody feels the split is arbitrary.
On $800 rent and $120 bills between 4 flatmates, with $40 extra for the main room, the remaining $760 of rent splits to $190 each. The main room occupant pays $190 plus $40, plus their $30 bills share, about $260. The other three pay $190 plus $30, about $220 each.
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