1. Even split
Divide the bill by the number of people. It works when rooms are similar and everyone lives a similar life. Internet is the classic even-split bill.
Free calculator
How to split utilities with roommates fairly
Rent is a fixed number in the lease. Utilities change every month, and that is where flatmate arguments start. Pick a method below, try it in the calculator, and write the rule down before the next bill lands.
Utility split calculator
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Four fair ways to split utilities
2. Split by room size
If one room is clearly bigger or has its own bathroom, split rent and heating by size. A 55/45 or 40/30/30 split is common.
3. Split by usage
When one person works from home all day or runs a gaming PC, agree a rough share for electricity, such as 40% for the remote worker and the rest split evenly.
4. Split by days at home
If someone travels half the month, weight variable bills like water and gas by nights at home. Keep fixed bills like internet even.
You can mix methods per bill. That is fine as long as everyone agreed and it is written down. Our free roommate bill agreement template turns the rules into something you can print and sign.
Keep it from becoming a monthly argument
- List which bills are shared and which are personal.
- Pick a split method for each shared bill.
- Spread the accounts so one person isn't fronting everything.
- Log every bill in one shared place, not WhatsApp scroll-back.
- Settle up on a fixed day each month.
- Review the split every three months.
Questions
What is the fairest way to split utilities with roommates?
The fairest split is the one everyone agreed to before the first bill arrived. Most flats mix methods: internet even, heating by room size, electricity by usage. Write the rule down so nobody reconstructs it from memory.
Should a roommate who is away pay for utilities?
Fixed bills such as internet usually stay even, because the service is there whether they use it or not. For variable bills like water, gas, and electricity, weighting by days at home is a common and fair compromise.
My roommate's partner stays over most nights. Should they pay?
If a partner is there more than three or four nights a week, it is reasonable to ask them to chip in on water, electricity, and supplies. Raise it early and talk about the bills, not the person.
How do we handle someone moving out mid-month?
Pro-rate variable bills by days. For fixed bills, follow your move-out agreement; if it says nothing, pro-rating is the usual default.
How do we keep track of who paid what?
Log every bill in one shared place with the amount, who paid, and the agreed split, then settle on a fixed day each month. IPaid does this for free: add a bill, pick even or custom shares, and everyone sees what they owe.
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