WattFigure puts a price on leaving the hot tub running

Field notes

WattFigure calculates operating costs from wattage, usage hours, and a selected state rate, then expresses the estimate per hour, month, and year. The homepage provides a 50-appliance catalog and lists rates across the states and District of Columbia, including 52.72¢/kWh for Hawaii and 13.11¢/kWh for Nevada. Its source is the U.S. Energy Information Administration, while appliance usage values are identified as typical assumptions rather than measurements.