What is on the page
- Each state's average price per kWh, and what a heater on high costs per hour and per 30-day month at 8 hours a day. The range runs from $45.79 a month in Louisiana to $173 in Hawaii; the U.S. average is $65.92.
- The formula, so anyone can redo the sum with the price on their own bill: watts × hours ÷ 1,000 × price per kWh.
- Basic heater safety from the U.S. Consumer Product Safety Commission.
- Sources: U.S. EIA Electric Power Monthly, Table 5.6.A.
Printing and sharing
The sheet is free to print, copy and hand out under CC BY 4.0. Libraries that lend plug-in energy meters, energy-assistance programs and utilities are welcome to put it next to the meter or on a counter. Keep the WattCost credit at the bottom.
We replace it after each monthly EIA release. The link above always points to the latest version.
For your own rate, use the space heater cost calculator by state. For the full price table and CSV, see electricity prices by state.