What we do
HomeWattCheck translates power, usage, and electricity rates into understandable cost estimates. You can use an official state residential average or enter a rate from your own bill. Our appliance tools use different input methods when a single watts-times-hours shortcut would be misleading.
Independent and transparent
We are an independent calculator publisher, not an electricity supplier or a government agency. EIA supplies the published rate data; it does not endorse this site. Calculation formulas, illustrative inputs, source dates, and exclusions are available alongside the results.
Free access
There are no paid accounts, subscriptions, affiliate offers, or product sales. The intended funding model is display advertising. No advertising network is active in this version. Future ads will be placed outside calculator input and result panels.
Related tools
HomeWattCheck and CalcTimer have the same owner. Selected guides link to CalcTimer’s English unit converters and percentage calculator when they help with the task. These are ordinary links, not paid referrals. U.S. electricity estimates remain here; Korean utility calculations use different rules.
Editorial approach
We prioritize official sources and explain uncertainty. Starting values are examples, not claimed household averages. We avoid utility-specific promises and do not guarantee bill savings. If a source changes or cannot be validated, we retain the last verified snapshot rather than substitute guessed values.
Read Data Sources & Methodology or view contact information.