Work out shared rent split instantly with clear inputs, formula shown and shareable results.
A fair house share splits rent in two parts: bedroom space, allocated by area, and common areas — kitchen, bathroom, living room — split equally since everyone uses them the same. Putting 30-50% of rent in the common pool stops the smallest room paying almost nothing.
Rent split
my rent = (rent x (1 - common%)) x (my area / total bedroom area) + (rent x common%) / housemates
Because most of a flat is shared. Pure area splitting would have the person in the box room paying a quarter of the rent while using the same kitchen.
An en-suite, a balcony, better light or a parking space. Agree a small premium rather than arguing later.