Utility Split Calculator
Split electric, gas, water, and internet fairly among roommates using equal, bedroom-size, occupancy, or custom weighted shares.
Utility Bill Details
Roommates
Enter your utility details
Add roommates and their room details to calculate a fair utility split
Choosing the Right Split Method
Equal Split
Best when all rooms are similar in size and everyone uses utilities equally. Simple and easy to track.
By Room Size
Fair when rooms vary significantly in size. Larger rooms typically need more heating/cooling.
By Occupants
Best when some rooms have couples or multiple occupants who use more water and electricity.
Weighted Split
Most comprehensive approach, considering room size, occupants, and usage patterns for maximum fairness.
How this calculator works
Equal split: share = bill ÷ number of roommates. By square footage: share = bill × (room sq ft ÷ total sq ft). Weighted: share = bill × (occupant weight ÷ sum of weights).
Inputs
- Total bill amount — monthly utility or shared expense to divide.
- Split method — equal, by room size, by occupants, or custom weights.
- Roommate count or weights — determines each person's percentage.
- Room sizes — required for square-footage-based splits.
Assumptions
- All roommates are on the lease or have agreed to the split method.
- Bill covers one billing period without prior arrears mixed in.
- Shared spaces are included in room size totals or equal split baseline.
Limitations
- Does not track payments owed between roommates over time.
- Time-of-use or tiered utility rates are averaged into one bill input.
- Does not generate legally binding payment obligations.
Example calculation
- Electric bill $180, 3 roommates, equal split method.
- Each share = $180 ÷ 3 = $60.
- Switch to sq ft: rooms 120, 100, 80 → total 300 sq ft.
- Shares: $72, $60, $48 respectively.
Equal splits are simplest but unfair if one room is much larger or has more occupants. Put the agreed method in a roommate agreement.
Common mistakes
Splitting without a written agreement
Verbal splits cause disputes when someone moves out mid-month. Document the method before bills arrive.
Ignoring high-usage roommates
If one person runs AC all day, consider weighted splits or submetering instead of pure equal division.
Forgetting common-area usage
Kitchen and living room energy use belongs in shared allocation, not assigned to one bedroom.
Frequently asked questions
Disclaimer
LeaseCraft provides document automation and general information — not legal, tax, or financial advice. Calculator results are estimates for planning only. Consult a licensed attorney, accountant, or housing counselor for advice about your situation.