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Roommate Expense Split

Free Roommate Expense Split calculator with clear step-by-step results.

About Roommate Expense Split

Splits rent into a bedroom component allocated by room size and a common-space component split equally per person, which is fairer than either a flat split or a pure area split. A private bathroom carries a premium on the bedroom portion, and utilities divide per head.

Formulas

Bedroom and common split

70% of rent is allocated by bedroom area share, 30% equally per person

Your rent

Rent = bedroom portion x area share x bathroom premium + common portion / people

Worked example

With the default values below, Roommate Expense Split returns Your monthly total of $1,085.87. Change any input above and every figure here is recalculated in your browser.

Inputs used

Total monthly rentminimum 0 $
2,400 $
Total monthly utilitiesminimum 0 $
320 $
Your room as a share of all bedroom areaaccepts 1–99 %
40 %
Total people in the householdaccepts 1–12
3
Your room has a private bathroom
Yes
Premium for a private bathroomaccepts 0–40 %
10 %

Results

Your monthly total
$1,085.87
Your share of rent
$979.20
Your share of utilities
$106.67
Your share of the household cost
39.9% %

Step by step

  1. 1Values used
  2. 2Bedroom and common split
  3. 3Your rent
  4. 4Your monthly total= $1,085.87
  5. 5Your share of rent= $979.20
  6. 6Your share of utilities= $106.67
  7. 7Your share of the household cost= 39.9 %

Assumptions and limits

  • The result is derived only from the 6 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why 70/30 between bedroom and common space?

It reflects that bedrooms are exclusive but the kitchen, living room and bathroom are shared equally. Adjust the split by moving the area share if your household disagrees.

Should utilities be split by usage?

Ideally, but metering per room is rarely practical. Per-head is the usual compromise, with an adjustment if someone works from home all day.

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Roommate Expense Split – Calculate Your monthly total