Utility bill split calculator
Split electricity, gas, water or internet by household, by days present, or by headcount.
Enter the bill amount to see the split.
Utilities are the bills that cause the most low-grade friction in a shared house, because they arrive at irregular intervals and rarely match how the house was actually used. Enter the bill and pick how it should divide.
Three methods cover most households: evenly, prorated by the days each person was there, or weighted by how many people occupy each room.
When even is the right answer
For internet, an even split is almost always correct. Bandwidth isn't consumed in a way anyone can measure per person, the bill doesn't change with usage, and attempting to apportion it creates an argument with no factual resolution.
The same logic applies to a standing charge on an energy bill — the part you pay for being connected at all, regardless of what you use. Some households split the standing charge evenly and the usage portion by another method, which is more work but genuinely more accurate.
Prorating by days present
Someone away for three weeks of a billing period did not use three weeks of heating. Enter the days each person was actually in the house and the bill divides accordingly.
Two details matter. Use the billing period's real length rather than assuming a month, since energy bills often cover odd numbers of days. And agree in advance whether a short trip counts — most households set a threshold, like a week, below which nobody bothers adjusting.
Weighting by headcount
A couple sharing the main bedroom is two people using hot water, not one. Weighting by the number of occupants per room is the usual fix, and it is the method most likely to feel fair in a house where some rooms are shared.
It is not automatically right for every bill. Water and energy scale with people; internet does not. Households that use headcount for utilities and an even split for internet tend to have fewer arguments than those that pick one rule for everything.
Agree the method before the bill arrives
The pattern behind almost every utility dispute is the same: the method gets chosen after the amount is known, when everyone can already see whether it helps or hurts them. Deciding at the start of a tenancy — and writing it down — removes that entirely, and takes about five minutes.
Questions
- How should roommates split utility bills?
- Evenly is standard and works well for internet and standing charges. Prorating by days present is fairer when someone travels, and weighting by the number of people per room is fairer when some rooms are shared.
- How do I split a utility bill when someone was away?
- Prorate by days. Enter how many days of the billing period each person was in the house and the bill divides in proportion. Use the period's actual length rather than assuming 30 days.
- Should a couple sharing a room pay double?
- For water and energy, weighting by headcount is the common approach, because two people genuinely use more. For internet it makes less sense, since the cost doesn't change with the number of users.
- What about the standing charge on an energy bill?
- It is charged for being connected rather than for usage, so most households split it evenly even when they divide the usage portion another way.
- How do we handle a bill that arrives after someone moves out?
- Split it by the days each person was actually there during the period the bill covers, not by who is living there when it arrives. Take a meter reading on the move-out date if the supplier allows it.
When one calculation isn’t enough
A calculator answers a single question. Make It Even keeps the answer current: add expenses as they happen, split each one however it needs to be split, and everyone sees the running balance. It handles multiple currencies using the exchange rate from each expense’s own date, so old totals never drift.
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