Basics
What does a kWh cost?
Learn how cents per kWh turns into the cost on your electricity bill.
Guides
Energy math made useful.
Guides support calculator pages by explaining the assumptions readers need to make better estimates.
Good electricity estimates depend on a few plain concepts: watts, kilowatt-hours, runtime, duty cycle, and the delivered rate on a bill. These guides keep those concepts short and practical so calculator pages can stay focused.
The guide library should expand around questions that improve calculator accuracy, not around broad energy trivia.
Measurement
How to measure appliance electricity use
Decide when a wattage estimate is enough and when a plug-in meter gives a better answer.
Worksheet
Home energy audit worksheet
Print a room-by-room worksheet for appliance use, draft checks, and next-step priorities.