HOW TO SPLIT BILLS WITH ROOMMATES

Roommate money problems are rarely about the money. They're about one person feeling like they're carrying more than their share and not having a clean way to say so. Fix that with rules agreed up front, and the whole subject stops being emotional.

RENT: WEIGHT IT BY ROOM

Splitting rent evenly only works when the rooms are genuinely equivalent. They almost never are. The standard approach is to weight by square footage and then adjust for real differences:

• • Private bathroom: typically a 10–20% premium on that room's share.
• • No window or a tiny window: a discount, and a real one.
• • Sharing a room: two people in one room usually pay more in total than one person in that room, but less each.
• • Street noise, top-floor heat, no closet: negotiate once, then leave it alone.

Run the numbers with the rent split calculator, then write the result down somewhere all of you can see. The written-down part matters more than the precision.

UTILITIES: EVENLY, AND AUTOMATE THE PAYER

Electricity, gas, water, internet: split evenly. Attempting to meter individual usage is a rabbit hole that produces small savings and large resentment. The exception is a genuinely asymmetric case — someone works from home all day running a space heater — and that's a conversation, not a formula.

Give each bill a designated payer whose card is on the account, and reimburse them monthly. Rotating who pays each bill sounds fair and creates chaos.

GROCERIES: ALL IN OR ALL OUT

The worst system is the half-shared one, where staples are communal but "your" food is yours. It requires constant judgement calls about whether oat milk is a staple. Pick one:

• • Fully shared: everything goes in the shared list, split evenly. Simplest, works when everyone eats similarly.
• • Fully separate: your food, your money. Only shared supplies (paper towels, dish soap, salt) go on the list.

SETTLE MONTHLY, ON A FIXED DATE

Pick a date — the first, or the day after rent clears — and settle everything then. A fixed date removes the need for anyone to ever chase anyone. Net the balances first so it's two payments, not nine; the settle-up calculator does that in a few seconds.

THE CONVERSATION TO HAVE ON DAY ONE

• • How is rent weighted, and what happens when someone swaps rooms?
• • Which bills are shared, and who is the payer on each?
• • Groceries: shared or separate?
• • What's the settle date, and what's the acceptable delay?
• • What happens with guests who stay a week?

QUESTIONS

How should roommates split bills?

Split rent by room value (size, light, private bathroom), and split shared utilities and household supplies evenly. Groceries work best either fully shared or fully separate — half-shared groceries cause the most friction.

Is it fair to split rent evenly when rooms are different sizes?

Usually not. A common approach is to weight rent by square footage, then adjust for real differences like an en-suite bathroom or a windowless room. Agree the weighting once, in writing, before anyone moves in.

What's the easiest way to track shared household expenses?

One shared list everyone can add to from their phone, settled monthly. The tracking method matters less than everyone using the same one — parallel systems are what actually cause disputes.