Utility Split Calculator
Split electric, gas, water, and internet fairly among roommates using equal, bedroom-size, occupancy, or custom weighted shares.
Your details
Roommates
Enter your details to see the result.
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
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Equal splits work for similar rooms; square footage or occupancy weights are fairer when rooms differ.
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Often yes if everyone uses it. If one person subleases a room without internet need, adjust weights.
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Prorate that person's share for days present or recalculate among remaining roommates for the full bill.
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Yes, but others should reimburse promptly. Named account holder bears credit risk if others do not pay.
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Submeters give the most accurate split but require landlord installation. Use occupancy weights when submeters are unavailable.
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Yes—include split method, due dates, and how late payments are handled.
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.