Shared Utility Allocation Calculator
Split a master-metered utility bill across units by occupants, floor area, unit count or a weighted blend, after the owner’s common-area share.
Result
Billed to occupied units: $810.00
Arithmetic only. Whether a shared meter may be billed to tenants, and by which method, depends on the lease and local rules.
- Paid by the owner
- $90.00
- Common-area share
- $90.00
- Shares of empty units
- $0.00
- Split across the units
- $810.00
https://calcgallery.com/real-estate/shared-utility-allocation-calculator/
Results are arithmetic from the numbers you enter, not investment, lending, tax or valuation advice. The site supplies no rents, prices, cap rates or market data, and whether a deal is sound depends on facts no calculator can see. Read the full disclaimer
How to use the Shared Utility Allocation Calculator
- Enter the bill for the period and choose how it is split.
- Set the common-area share, as a percentage of the bill or as a metered amount.
- Add a row for each unit on the meter with its occupants and floor area. Zero occupants marks a unit as empty.
Splitting one meter across several homes
to split = bill − common-area shareunit weight = its occupants ÷ all occupants (by occupants) = its floor area ÷ all floor area (by floor area) = 1 ÷ number of units (equally)unit's share = to split × unit weightMany small buildings have one water or gas meter for every unit. The bill still has to be divided, and the common methods are the ones Texas’s allocation rule lists: by the number of occupants, by floor area, or by a combination of the two. An equal split per unit is the simplest of all.
Blending methods
A blend gives each method a weight, and each unit’s weight is the weighted sum of its three shares. Half on occupants and half on floor area, for example, gives a one-person flat in a large unit a share between what either method alone would give it. The three weights have to add up to 100%, and the page says so if they do not.
What stays with the owner
Two things come out before the tenants’ total: the common-area share, and the shares of any empty units. Both are shown, and together they are what the owner pays. The tenants’ shares always add up to the rest of the bill to the cent.
Arithmetic only
Allocated utility billing is regulated differently from place to place: some rules fix the method, require a minimum common-area deduction, cap fees or require notice in the lease, and some utilities cannot be billed this way at all. This page does not check any of that; the rules where the property is decide what is allowed.
With your numbers
- To split = $900.00 − $90.00 common area = $810.00
- 1A: 33.33% × $810.00 = $270.00
- 1B: 16.67% × $810.00 = $135.00
- 2A: 50% × $810.00 = $405.00
- 2B: 0% × $810.00 = $0.00 (empty, owner pays)
- Billed to occupied units = $810.00 − $0.00 = $810.00
Quick reference
Arithmetic only. Whether a shared meter may be billed to tenants, and by which method, depends on the lease and local rules.
| Example | Billed to occupied units |
|---|---|
| By occupants, 10% common area | $810.00 |
| By floor area | $652.57 |
| Equally per unit | $607.50 |
| Half occupants, half floor area | $731.29 |
| Blend with a metered common area | $719.61 |
| Duplex water bill, no common area | €240.00 |
Common questions about the Shared Utility Allocation Calculator
- Which method is fairest?
- None is right for every building, and the page does not pick one. Occupants follows the number of people using the supply; floor area follows the size of each home; an equal split is simplest. A blend weights two or three of them. Where a rule or the lease names a method, that one applies.
- Why does an empty unit’s share go to the owner?
- Nobody lives there to bill. Under the occupants method an empty unit has no share at all; under floor area or unit count it still has one, and the page shows it as the owner’s cost rather than spreading it over the tenants.
- What is the common-area share for?
- Water and power used outside the units, such as hallway lights, a shared laundry, a pool or irrigation, is usually treated as the owner’s cost. It comes off the bill before the split. If those areas are metered separately, enter the metered amount; otherwise enter a share of the bill. Some rules set a minimum share; this page stores none.
- Why do the unit shares differ by a cent from the percentages?
- Each share is rounded to a whole cent in a way that keeps the total exact: the cents left over go to the units with the largest remainders. Rounding each share on its own would leave the parts a cent or two off the bill.
- Can a landlord bill tenants for a shared meter at all?
- It depends on where the property is. Some places regulate allocated billing closely, some set disclosure or method requirements, and some do not allow it for certain utilities. The lease matters too. This page only does the arithmetic.