Allocation Rule Calculator

Allocate unmetered electricity fairly and transparently—while reconciling to the building total.

Educational tool. Allocation rules should be documented and applied consistently.

Processed in-browser. Nothing is stored.

Inputs

Master meter reading for the period

Submetered Tenants

Tenants with direct meter readings

kWh
kWh

Unmetered Tenants

Tenants to receive allocated kWh

Allocation Basis:

sq ft
sq ft

How to use this tool

  1. 1Enter the building's total kWh for a period (master meter).
  2. 2Add submetered tenants with their measured kWh (if any).
  3. 3Add unmetered tenants with their allocation basis (e.g., area).
  4. 4Choose allocation method (area, headcount, or custom).
  5. 5Review the reconciled output and copy/download it.

What the results mean

Allocation is a transparency tool—not a perfect measurement.

The goal is consistency, auditability, and the ability to improve over time.

The calculator forces reconciliation so you don't accidentally over/under allocate.

Example (sanity check)

Building = 100,000 kWh; Submetered: A=20,000, B=15,000; Unmetered: C=10,000 sqft, D=20,000 sqft

Remainder: 100,000 − (20,000 + 15,000) = 65,000 kWh

Tenant C: 65,000 × (10,000 / 30,000) = 21,666.67 kWh

Tenant D: 65,000 × (20,000 / 30,000) = 43,333.33 kWh

✓ Reconciles back to 100,000 kWh

Common pitfalls

  • Submeter totals exceed building total (usually a data timing/period issue)
  • Allocation basis values don't represent the same population (missing tenants)
  • Using different allocation methods month to month without documentation
  • Forgetting common area treatment (decide and document whether it's included)

Change log

v1.0 (2026-01): Latest release