Estimate energy and cost savings for energy- and water-efficient product categories using these interactive calculators provided by the Federal Energy Management Program or ENERGY STAR. Commercial Heating and Cooling Air-Cooled Chillers Boilers Commercial Heat Pumps Commercial Rooftop Air Conditioners Residential Heating and Cooling Air-Source Heat Pumps Central Air Conditioners Electric and Gas Water Heaters Gas […]

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  • Energy Calculators

    From gallons to British thermal units (Btu), kilowatthours to megajoules, short tons to metric tons — this handy calculator converts from one energy unit to another. Calculators for Energy Used in the United States Coal Electricity Natural gas Crude oil Gasoline Diesel and heating oil Residential heating fuels Measuring energy in food — food

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