Understand your estimate
How to use this result
Compare appliance energy with billed gross household kWh over the same start-to-next-reading interval. Keep period counts, evidence and overlapping loads explicit; any unexplained difference is not automatically waste or a billing error.
Method reviewed · Calculation methods · Evidence and source policy
Find the right inputs
Billing boundary
Start date included; end reading date excluded; gross kWh
Net imports alone can differ from consumption when solar or batteries are involved.
Appliance rows
Actual cycles, representative daily energy, power/time or annual estimate
Each row lies within the bill interval and identifies observed or estimated evidence.
Overlap review
Confirmation and source context
Do not list a complete measurement alongside component rows already inside it.
The calculation
Difference = billed gross kWh − sum of compatible period appliance kWh. Accounted percentage = entered appliance kWh ÷ billed kWh × 100, only when billed kWh is nonzero.
A worked arithmetic example
Illustrative arithmetic: a 30-day bill shows 300 kWh and non-overlapping listed appliances total 180 kWh. The listed share is 60% and the difference is 120 kWh. This does not identify which unlisted appliances used that energy.
What the estimate can tell you
Annual-label proration is a uniform estimate, not an observation of a seasonal bill. A negative difference is retained as an overage for review rather than silently forced to zero.
Questions about this calculation
Can an import-only bill be used as gross consumption?
Not without reconciling onsite generation, exports, batteries and the applicable energy boundary. Confirm a comparable gross-consumption figure first.
Does a large difference prove a faulty meter?
No. Missing loads, date or scope mismatches and estimates can explain it. The tool organizes a check; it does not diagnose the meter or the bill.