Understand your home energy bill — then lower it
4 free calculators for electricity costs, whole-home audits, heat pump vs furnace decisions, and per-appliance energy use. Pull back the curtain on where your energy dollars go.
Four tools to decode your electricity bill
Each calculator uses DOE / Energy Star appliance data and EIA state electricity rates. Instant results, nothing to install.
Electricity Cost Calculator
Calculate your monthly and annual electricity costs based on your usage and state's average rate.
OpenHome Energy Audit Calculator
Estimate your annual home energy costs by category and identify the biggest savings opportunities.
OpenHeat Pump vs Furnace Cost Comparison
Compare the operating cost of a heat pump vs. a fossil-fuel furnace over 15 years.
OpenHome Appliance Energy Cost Calculator
Calculate the monthly and annual energy cost of common household appliances based on your electricity rate.
OpenHow these energy calculators fit together
A brief map of the tools and the decisions they answer.
Our home energy calculators help you understand where your energy dollars actually go and where you can save the most. Whether you're trying to bring down a high electric bill, deciding whether to switch from a gas furnace to a heat pump, or simply curious which appliances cost the most to run, these tools give you straightforward, instant answers.
We use reference data from the U.S. Department of Energy, Energy Star, and the EIA. All calculations run in your browser — there's no signup, no email capture, and no sales pitch on these pages.
Most homeowners can reduce their energy bills 20–30% through cost-effective efficiency upgrades. The biggest wins are usually HVAC and water heating (typically 55–70% of total home energy use), but appliance upgrades and lighting changes can also matter — especially when stacked over years. Use these calculators to figure out where your specific opportunity is.
Common questions about home energy savings
Fast answers on efficiency wins, heat pumps, and making sense of your appliance bill.