Updated 2026-11-09

What do your appliances really cost to run?

The rule: energy (kWh) = watts ÷ 1,000 × hours. Cost = kWh × your electricity rate. Everything on this site is that one formula, shown step by step.

Start here

• Appliance cost calculator: any device, any rate.
• What a 1,500-watt space heater costs to run.
• How to find your rate and read your electric bill.

No savings percentages are promised here, because they depend on your home and habits.