WattCostCalculator is an independent website launched in October 2026 to help readers understand appliance electricity use and estimate energy costs.
What you can find here
- A free electricity cost calculator for daily, monthly and annual estimates.
- Worked examples for space heaters and air conditioners.
- Explanations of watts, kilowatt-hours and how utility rates change a cost estimate.
How to interpret our guides
Examples state their wattage, hours, electricity rate and other assumptions. They are illustrative calculations, not product tests or guaranteed savings. Use manufacturer specifications and your own utility tariff for a more relevant result. Where a guide refers to external data or safety advice, it links to the relevant source.
We are not affiliated with the U.S. Energy Information Administration, the U.S. Department of Energy or the Consumer Product Safety Commission. Their public resources are cited for reference.
Corrections and contact
See Contact Us for current contact availability. Our dedicated mailbox is being set up. Read our Privacy Policy for information handling.
Updated October 20, 2026.