How it works
How this tool works.
When a building shares one utility meter, the bill still has to be divided fairly among the units. The two most common approaches are an even split and a split weighted by occupancy, on the logic that more residents use more water, gas, or electricity. Both are forms of a ratio utility billing system, or RUBS.
Enter the total bill and pick a method — even, or by occupancy — and this calculator estimates each unit’s share. It’s arithmetic on your inputs; whether and how you can bill tenants for utilities depends on your lease and local rules.
Enter the total utility bill for the period.
Choose a split method: even across units, or weighted by occupancy.
For an even split, set the number of units; for occupancy, enter this unit’s residents and the building’s total.
The tool estimates the share for the unit — and, on an even split, confirms the shares sum back to the full bill.
Make the result useful
Utility-bill allocation
Total bill is the master-meter or shared invoice being allocated.
Split method is the agreed equal-unit or occupancy-weighted approach.
Unit or occupant counts must cover the same bill period.
The output should reconcile back to the whole bill after rounding.
The assumptions that move this result
Bill
Total shared invoice.
Method
Equal or occupancy-weighted allocation.
Units/occupants
Counts for the bill period.
Share
Calculated amount assigned.
equal share = bill ÷ units; occupancy share = bill × unit occupants ÷ total occupants
Use the output as a documented scenario result, not a guarantee.
Read the number in context
Worked scenario
Scenario: $480 ÷ 4 units = $120 each.
Edge case
Edge case: an occupancy count of zero cannot support a weighted split.
Does not determine whether pass-through billing is allowed.
Before you act
• Check lease terms.
• Confirm meter and period.
• Document counts and rounding.
Worked formula
equal share = bill ÷ units; occupancy share = bill × unit occupants ÷ total occupants
Is this a forecast?
No. It calculates the assumptions you enter.
Can it replace professional review?
No. Use current records and qualified advice.
What should I save?
Keep the assumptions and source records used for the decision.