Splitting Bills With Housemates: A Fair Split When the Rooms Are Not the Same

• Rent: split by what each person gets
• Bills: split by use only where use really differs
• Keep it written and automatic
• When someone earns much less
• Free tools

Splitting rent and bills evenly is simple, but it rarely feels fair when one person has the big room with a private bathroom and another has the box room. A clear rule agreed at the start avoids most arguments later.

§Rent: split by what each person gets

A common method is to weight rent by room size, then adjust for extras.

Example: rent is $2,400 for three people.

• Shared space (kitchen, living room) is split equally. Say it counts for 40% of the rent: $960, so $320 each.
• The other 60% ($1,440) is split by bedroom floor area. Rooms of 15, 11 and 9 m² total 35 m², so the shares are 43%, 31% and 26%: about $617, $453 and $370.
• Totals: $937, $773 and $690.
• Extras like a private bathroom or parking space can be priced separately, for example an extra $75 a month moved from the other two people to the person who has it.

§Bills: split by use only where use really differs

• Internet, water and basic utilities are usually split equally. Tracking exact use costs more effort than it saves.
• If one person works from home all day or runs a heater in their room, agree a fixed top-up (say $20 a month in winter) instead of reading meters.
• Streaming and subscriptions: only the people who use them pay.

§Keep it written and automatic

• One shared list: each bill, the amount, due date, who pays it, and each person’s share.
• The person whose name is on a bill should get the others’ shares before the due date, not after. A standing transfer on payday does this without reminders.
• Agree what happens when someone moves out: notice period, who pays until a replacement arrives, and how the deposit is split.

§When someone earns much less

Some households split by income instead of room. That works when everyone agrees, but write it down, because it changes every time someone’s pay changes.

§Free tools

• Bill split calculator: https://smartbudgetsheets.surge.sh/calculators/bill-split-calculator-couples/?utm_source=nostr
• Rent affordability calculator: https://smartbudgetsheets.surge.sh/calculators/rent-affordability-calculator/?utm_source=nostr
• Electricity cost calculator: https://smartbudgetsheets.surge.sh/calculators/electricity-cost-calculator/?utm_source=nostr
• Debt Payoff Planner, up to 8 debts (Payhip): https://payhip.com/b/PtBLU?utm_source=nostr
• 42 free budget templates, pay what you want ($0 is fine): https://smartbudgetsheet.gumroad.com/l/ngpkrb?utm_source=nostr

General information, not financial advice. Figures are rounded examples.