Utility Bill Split Calculator
Split shared bills fairly by room, income or headcount.
Enter your values
ⓘ Live results
Results
- Equal split
- $160.00
- By room size
- $182.86
- By income
- $170.67
- Fairness gap (room vs equal)
- $22.86
Quick answer
Bills can be split equally, by room size, or in proportion to income — this tool shows all three.
share = total x (your weight / sum of weights)
How to use the Utility Bill Split Calculator
- 1Enter the combined bill total for the period.
- 2Add your room size and the total of all rooms if splitting by space.
- 3Agree a single method up front and stick with it.
Worked example
Using the values the calculator loads with:
Inputs
- Total bills480 $
- Housemates3
- Your room size16 m²
- All rooms combined42 m²
- Your income3200 $
- Combined income9000 $
Results
- Equal split$160.00
- By room size$182.86
- By income$170.67
- Fairness gap (room vs equal)$22.86
Frequently asked questions
Which method is fairest?
Room size works for rent and heating; equal split is simplest for internet and streaming.
What about heavy users?
Add a fixed surcharge for a private aircon, gaming rig or electric car.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.