Utility Bill Split Calculator
Split shared bills fairly by room, income or headcount.
Enter your values
Enter the total bills in $.
Enter the housemates you are working with.
Enter the your room size in m².
Enter the all rooms combined in m².
Enter the your income in $.
Enter the combined income in $.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Equal split
- $160.00
- By room size
- $182.86
- By income
- $170.67
- Fairness gap (room vs equal)
- $22.86
Quick answer
Bills can be split equally, by room size, or in proportion to income — this tool shows all three.
share = total x (your weight / sum of weights)
At a glance
| What it does | Split shared bills fairly by room, income or headcount. |
|---|---|
| Category | Finance |
| Inputs needed | Total bills, Housemates, Your room size, All rooms combined, Your income, Combined income |
| Main output | Equal split |
| Formula | share = total x (your weight / sum of weights) |
| Cost | Free — no sign-up, no download |
How to use the Utility Bill Split Calculator
- 1Enter the combined bill total for the period.
- 2Add your room size and the total of all rooms if splitting by space.
- 3Agree a single method up front and stick with it.
Inputs explained
- Total bills($)
- Enter the total bills in $.
- Housemates
- Enter the housemates you are working with.
- Your room size(m²)
- Enter the your room size in m².
- All rooms combined(m²)
- Enter the all rooms combined in m².
- Your income($)
- Enter the your income in $.
- Combined income($)
- Enter the combined income in $.
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.
What do I need to enter into the Utility Bill Split Calculator?
Just 6 values: total bills, housemates, your room size, all rooms combined, your income, combined income. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Utility Bill Split Calculator work out the answer?
Bills can be split equally, by room size, or in proportion to income — this tool shows all three. It applies the formula share = total x (your weight / sum of weights) and shows the working so you can check each step by hand.
Is the Utility Bill Split Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.