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Roommate Utility Split Calculator

Enter the total bill and how many roommates share it.

How it is calculated

The split is an equal division: share = total bill ÷ number of people. The bill is the full amount on the statement in US dollars and the number of people counts everyone who pays, including yourself. The tool shows the per-person share, the total bill it started from and the headcount. The share is rounded to the nearest cent only for display, so shares multiplied back by the headcount can differ from the bill by a cent or two. The headcount must be a whole number of at least 1, so 0 or a fraction such as 2.5 gives no result, and so does a negative bill; a bill of 0 is allowed and shows $0.00. Nothing is weighted by room size, usage or days lived in the home; if the bill should be shared unevenly, work out each person's portion separately.

Worked example

A household receives one combined bill of 187.45 for electricity and internet, and three people share it. The calculation is 187.45 ÷ 3 = 62.4833..., which is shown as $62.48 per person. The total is repeated as $187.45 and the headcount as 3 people. Three payments of 62.48 add up to 187.44, so one person needs to pay a cent more to cover the bill exactly.

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Common mistakes

  • Forgetting to count yourself in the headcount. With four people living in the flat, enter 4, not 3, otherwise everyone is overcharged.
  • Splitting a bill equally when usage is clearly unequal, for example when someone is away for most of the month or has a much larger room. An even split is fair only when the arrangement is genuinely equal.
  • Adding up the rounded shares and expecting an exact match. Rounding to cents can leave a gap of a cent or two, so agree who covers the difference.
  • Entering a part-time resident as a fraction, such as 2.5 people. Only whole headcounts are accepted and the tool shows nothing; split by time lived instead, working out each portion separately.
  • Typing a monthly bill but dividing by a count that changed during the month. If a roommate moved in or out, share the bill by time lived rather than by simple headcount.

About this calculator

Splitting a shared utility bill evenly means dividing the total amount by the number of roommates sharing it, giving each person's fair per-head share for costs like electricity, water, internet, or gas that are typically billed as one lump sum to a household rather than metered per resident.

This simple division is a household staple for roommates, shared apartments, and co-living arrangements settling up monthly bills without a spreadsheet — entering the total and the headcount instantly shows what each person owes, useful for quickly resolving who-owes-what conversations or setting up a recurring reminder for rent-and-bills day.

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  • Editorial team

    The Roommates field counts everyone who pays, including you, so a flat of four people means entering 4. The tool takes one bill at a time, so if usage is uneven, run internet and electricity as separate bills, then add up each person's shares. Rounded cents may leave a small gap that someone covers. How does your household split bills: equally, by room size or by usage?

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