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Compare an existing appliance to a more efficient replacement. Reports annual kWh and dollar savings, plus a rough CO₂ delta.
Compare an existing appliance to a more efficient replacement. Reports annual kWh and dollar savings, plus a rough CO₂ delta.
Results are estimates intended as a starting point. Verify against your project's specifics, manufacturer data, and applicable codes before relying on them. Use at your own risk. Read full terms.
The calculator converts each appliance to annual energy as kWh/yr = (watts x hours/day x days/yr) / 1000, then multiplies the kWh difference between the old and new unit by your electricity rate. For example, replacing a 1500 W unit with a 1000 W unit running 5 hours a day, 365 days a year, saves about 912 kWh, or roughly $110 at $0.12/kWh.
It multiplies the annual kWh saved by 0.92 lb/kWh, the US national grid-average carbon factor (EIA/EPA, roughly 2024). This is a rough national figure: coal-heavy grids such as WV, KY, and WY exceed 1.5 lb/kWh, while renewables-heavy grids like VT, ID, and WA run under 0.5, per EPA eGRID.
The field defaults to $0.12/kWh, a typical US residential average, but you should enter your own rate from your utility bill for an accurate dollar figure. Real-world duty cycles also often differ from rated use hours, so verify against utility data when available.