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Free utility tool

RUBS Calculator

Model the math behind a Ratio Utility Billing System when your property gives you the allocation pool and weighting factors.

Use the allocation units stated by your property. RUBS formulas vary; occupancy, square footage, bedrooms and other weighting methods are not interchangeable. This calculator checks math, not legality.

How to use it

Use the property’s formula, not a guessed one

RUBS can use occupants, square footage, bedrooms, bathrooms or a custom weighting system. Enter the same allocation units the property says it used. The calculator then checks the arithmetic of that simplified formula.

Ask for these inputs if they are missing

  • The property utility expense or resident allocation pool.
  • Any common-area, vacancy or other exclusions before allocation.
  • The total allocation units in the pool.
  • The allocation units assigned to your household.
  • Any separate billing or administration fee.

What this calculator does not decide

It does not determine whether the allocation method itself is permitted, whether the inputs are accurate, or whether the lease properly authorizes the charge. Those are separate state, local, lease and evidence questions.

Math check only. If your actual property uses a more complex formula, use its written calculation rather than forcing it into this model.