Free Roommate Expense Split calculator with clear step-by-step results.
Splits rent into a bedroom component allocated by room size and a common-space component split equally per person, which is fairer than either a flat split or a pure area split. A private bathroom carries a premium on the bedroom portion, and utilities divide per head.
Bedroom and common split
70% of rent is allocated by bedroom area share, 30% equally per person
Your rent
Rent = bedroom portion x area share x bathroom premium + common portion / people
It reflects that bedrooms are exclusive but the kitchen, living room and bathroom are shared equally. Adjust the split by moving the area share if your household disagrees.
Ideally, but metering per room is rarely practical. Per-head is the usual compromise, with an adjustment if someone works from home all day.