How to Calculate Electricity Sub-Meter Bills Fairly in a PG or Hostel

With the widespread use of air conditioners, electric kettles, and laptops, electricity consumption varies widely between rooms.

When a property attempts to divide a single building electric bill equally across all residents, tenants who use minimal power feel unfairly treated. Installing individual room sub-meters ensures that occupants pay only for the power consumed inside their specific room, preventing arguments and building long-term goodwill.

Calculating sub-meter electricity involves three straightforward steps:

• Step 1: Determine Consumed Units (kWh): $$\text{Consumed Units} = \text{Current Month Reading} - \text{Previous Month Reading}$$

• Step 2: Calculate Total Room Cost: $$\text{Room Bill} = \text{Consumed Units} \times \text{Agreed Per-Unit Tariff (₹)}$$

• Step 3: Split Among Active Room Occupants: $$\text{Per-Tenant Share} = \frac{\text{Room Bill}}{\text{Number of Active Occupants in the Room}}$$

• Fix a Reading Date: Record meter numbers on the same day every month (typically on the 1st or 30th) to maintain consistent billing cycles.
• Share the Reading Clearly: Note the opening and closing meter figures on the rent slip so roommates can verify the math themselves.
• Handle Vacancy Periods Accurately: If a bed was vacant for part of the month, divide the bill only among the tenants who were active occupants during that billing period.

The PGZoo Owner App includes a built-in sub-meter calculator. Property managers simply enter the previous and current meter readings alongside the per-unit rate.

The app computes the consumed units, divides the amount among the room's registered occupants, and adds the utility charge directly to the monthly rent summary for clear, itemized accounting.