The electricity bill lands, the internet renews, and the water statement arrives in the same week. Someone says they will sort it out, nobody does, and a month later it is awkward to ask who paid what. Utilities are small compared with rent, but they are a very common reason roommates start to feel annoyed with each other.
The good news is that this is easy to fix with a rule everyone agrees on in advance. This guide covers four fair ways to split electricity, internet, water and gas, with numbers you can copy.
The short answer: split fixed bills, such as internet, equally. For bills that change month to month, such as electricity, gas and water, split equally if everyone is home a similar amount, or split by days at home if people are away often. Agree the rule before the first bill arrives and write it down.
The four fair ways to split utilities
1. Equal split
Add up all the bills and divide by the number of roommates. It takes seconds, needs no tracking and works well when everyone lives there full time and uses a similar amount. It is the best starting point for most households.
2. Split by days at home
If someone travels a lot, works away or only stays part of the month, an equal split means the others cover their share of heating, lighting and water. Instead, count the days each person was actually home (person-days) and split the variable bills in proportion. A couple sharing one room can be counted as one and a half people, if everyone agrees.
3. Split by usage
When one person clearly uses much more, for example someone who works from home all day with a heater or air conditioner running, or a gaming computer that never switches off, you can ask that person to cover a bigger share of electricity. Exact meters for each room are rare, so most households agree on a fair estimate instead of measuring.
4. A shared bills fund
Everyone pays the same fixed amount each month into a shared account or pot, a little above the usual average. One person pays the bills from the fund, and every few months you check the balance and adjust. This smooths out expensive winter or summer months so nobody gets a nasty surprise.
Worked example: a $240 monthly total with 3 roommates
Imagine three roommates with these monthly bills: electricity $120, internet $60, water $40 and gas $20, for a total of $240.
Equal split:
- $240 ÷ 3 =
$80 each
Now suppose Roommate C is away for 10 of the 30 days this month. A fair way to handle this is to split the internet equally, because it is a fixed cost that does not depend on who is home, and split the rest by days at home.
Split by days at home:
- Internet ($60): $60 ÷ 3 =
$20 each - Electricity, water and gas ($180): person-days are A 30 + B 30 + C 20 = 80, so each person-day costs $180 ÷ 80 =
$2.25 - Roommate A: 30 × $2.25 = $67.50, plus $20 =
$87.50 - Roommate B: 30 × $2.25 = $67.50, plus $20 =
$87.50 - Roommate C: 20 × $2.25 = $45.00, plus $20 =
$65.00 - Total: $87.50 + $87.50 + $65.00 = $240.00
Roommate C saves $15 compared with the equal split, and the other two each pay $7.50 more. Whether that difference is worth the extra effort is up to your household. Many groups use the equal split most months and switch to days at home only when someone is away for a long stretch.
Worked example: a shared bills fund
If the same house pays $90 each every month, that is $270 going into the fund against an average of $240 in bills. The extra $30 builds a buffer for expensive months. If the buffer grows beyond what you need, lower the monthly contribution. If it runs low, raise it a little.
Wi-Fi, streaming and shared subscriptions
Internet and shared streaming subscriptions are best split equally, since everyone can use them. The person whose name is on the account is not responsible for covering it alone. If someone only uses the internet to work and never uses the shared streaming account, it is fair to leave that subscription out of their share, as long as everyone agrees.
A simple house system that prevents arguments
- Agree the rule before moving in. Decide which method you will use, and write it in your group chat.
- One person pays, everyone reimburses. The person who pays a bill posts the amount and each person's share within the same week.
- Keep a record. Save a screenshot or photo of each bill so there is never a disagreement about the amount.
- Settle monthly. Pay each other back on a fixed day, for example the first of the month.
- Rotate who holds the accounts. Spreading accounts around keeps the paperwork fair too.
When someone moves in or out mid-month
Prorate their share by days so nobody pays for time they were not there:
Formula: monthly share ÷ days in the month × days actually lived there
Example: a share of $80 in a 30-day month, moving out on the 20th. That is 20 days, so $80 / 30 × 20 = $53.33.
Settle the final bills before the person leaves, or agree clearly who will cover the last statement, since the bill for their final weeks often arrives after they have gone. If you are not sure who is responsible for what, check your own lease or local rules.
The four methods at a glance
| Method | Works best when | Watch out for |
|---|---|---|
| Equal split | Everyone is home about the same amount | Light users paying for heavy users |
| By days at home | Someone travels or stays elsewhere often | Needs honest tracking, so keep it simple |
| By usage | Separate meters, or one person works from home | Hard to measure on shared meters |
| Shared bills fund | Small, regular bills such as internet and basics | Someone must manage the pot and top it up |
A one-page house rule you can copy
Put these lines in your group chat and fill in the blanks. It takes five minutes and prevents most disagreements.
- Which bills are shared: electricity, gas, water, internet (and any others).
- The split: equal, by days at home, or by usage.
- Who holds each account, and who pays the provider.
- The day each month we settle up.
- What happens when someone moves in or out mid-month.
Messages you can copy
- “The electricity bill came in at $120 for the month. Split three ways that is $40 each. Please send it to me by Friday.”
- “Reminder: the shared bills fund is running low. Can everyone add $20 before the 1st?”
- “Since I am away for two weeks, can we split this month’s bills by days at home?”
Work out rent and bills together
The free Rent Splitter has a shared utilities section for Wi-Fi, power, gas and water, so you can calculate each roommate's rent and bills in one go. It works in dollars, pounds and rupees, needs no account, and runs entirely in your browser, so nothing you type is stored.
Open the Rent Split Calculator →
This article is general information, not legal or financial advice. Your lease and local rules decide who is responsible for which bills. Related reading: How to split rent fairly between roommates and How much to tip at a restaurant in the US.
Frequently Asked Questions
Should utilities be split equally between roommates?
Often, yes. If everyone lives in the house full time and uses a similar amount, an equal split is the simplest and causes the fewest arguments. If someone is away a lot or one person uses much more, splitting by days at home or by usage is fairer.
What if one roommate uses much more electricity?
Agree on a rule before the bills arrive. Many households keep internet and water equal and ask the heavy user to cover a larger share of electricity, or to cover the extra cost of a heater, air conditioner or a computer that runs all day.
Who should have the utility accounts in their name?
It does not matter for fairness, but it is worth sharing the load. One person can hold the electricity account while another holds the internet. Whoever holds an account should not end up paying for everyone, so settle up every month.
How do we split bills when someone moves out?
Prorate by days: divide that person's monthly share by the number of days in the month, then multiply by the days they actually lived there. Make sure the final bill is settled before their deposit or last payment is returned.
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