Your electricity bill jumps $40 one month and you have no idea why. Nothing changed, or so it feels, no new appliances, same routine. The truth is almost nobody actually knows what their individual appliances cost to run, we just see one lump total at the end of the month with zero breakdown of where it went.
The Usual Suspects
Space heaters, older refrigerators that no longer cycle efficiently, electric water heaters, and clothes dryers are consistently the biggest line items in a home’s electricity use, but without doing the actual math, it is impossible to know how much any one of them is really costing you versus just assuming.
The Math Is Simpler Than It Looks
Every appliance’s running cost comes down to three numbers: its wattage, how many hours you actually run it, and your real electricity rate. Multiply watts by hours, divide by 1,000 to get kilowatt-hours, then multiply by your rate. That is the entire formula, the hard part is just knowing your appliance’s actual wattage and doing the multiplication correctly.
Our Appliance Running Cost Calculator does that math instantly, plug in wattage and hours used, and see the real daily, monthly, and yearly cost. Do not know your appliance’s exact wattage? The calculator includes a reference table of typical wattages for common appliances to get you started.
Once you know which appliance is actually the expensive one, our Climate & Energy guide covers the smart thermostats and monitoring tools that can meaningfully cut it down.
Last Updated: August 2026.
