Stop Doing Utility
Math in Excel

Property & Unit Management

Save all your properties, units, tenants, and lease info in one place.

Automatic RUBS Calculations

Enter your utility bills, choose allocation method, get instant per-tenant charges.

Professional PDF Invoices

Generate clean invoices showing the breakdown. Download or email directly to tenants.

Email Invoices to Tenants

Send invoices to tenants with one click. Branded emails with amount due and deadline.

Payment Tracking

Record payments by cash, check, Venmo, Zelle. See outstanding balances at a glance.

CAM Reconciliation

Year-end common area maintenance reconciliation for commercial properties.

RUBS Utility Bill-Back Calculator

Calculate each tenant's share instantly — no signup required

What is RUBS?

RUBS (Ratio Utility Billing System) is a method for dividing a building's total utility costs among tenants based on predetermined factors like unit size, number of occupants, or a combination of both. It's commonly used in multifamily and commercial properties where individual metering isn't feasible or cost-effective.

How RUBS allocation works

The property owner receives the total utility bill, then divides it proportionally. With square footage allocation, a 1,000 sq ft unit in a 10,000 sq ft building pays 10% of each bill. With occupancy-based allocation, a unit with 3 residents in a building with 30 total residents pays 10%. Many landlords use a weighted combination for the fairest distribution.

Is RUBS legal?

RUBS legality varies significantly by state, county, and city. Some areas permit it broadly, others restrict it in rent-controlled units, and some require specific disclosure procedures.

⚠️ This calculator provides mathematical estimates only — not legal advice. Landlord-tenant utility billing laws are hyper-local and change frequently. Always verify current requirements with your local housing authority or a qualified attorney before implementing RUBS.