Electric bill calculator

How to use this tool

This calculator estimates one residential electric bill. The kilowatt-hours, month, and billing days you type stay in the browser. The result is arithmetic on a cited source. It is an estimate you can set next to your own bill.

Choose a state first. The county menu is the EIA Form 861 service-territory list for 2025. A county in that file means the utility reported serving some part of the county. It does not mean every address there is a customer, and the file has no ZIP codes. Leave the county on “All counties” to see the whole state, with the largest customer counts first. Type part of a name to narrow the list. The menu shows at most 400 matches. Add a county or a shorter name if the utility you want is missing.

Then set kilowatt-hours, the bill month, and the number of billing days. One thousand kilowatt-hours, October, and thirty days are the starting values, not a description of a typical house. Use the usage and the number of days printed on the bill you are checking. The month selects a season when the checked sheet has summer and winter energy charges. Billing days scale a daily customer charge when the sheet has one.

You may see two totals. They are not added together. The EIA average multiplies your kilowatt-hours by that utility's 2025 residential cents per kWh. That cents figure is residential revenue divided by residential sales. Bundled and energy rows come from Sales to Ultimate Customers. Texas transmission and distribution utilities come from Delivery Companies, because they are not in the sales file. The label says bundled, delivery, or energy. A delivery price is the delivery portion only. It is not a Texas retail energy plan. State and U.S. comparisons on the utility page come from the Average Bill file, not from adding this utility into the state total.

A tariff total appears only when a residential schedule was read from the utility's own sheet. The calculator applies the printed fixed charge and the printed per-kilowatt-hour lines, then rounds once to the cent. The coverage line states what was left out. A base schedule excludes fuel and riders the tariff itself lists as extra. Georgia Power and Duke Energy Carolinas in North Carolina are checked that way. A bundled total can still exclude named taxes and fees. Florida Power & Light is checked that way: gross receipts tax and franchise fees are not in that total, and the insert's minimum base bill is not applied. A delivery-only total excludes the retail energy charge. Oncor, CenterPoint, AEP Texas, and Texas-New Mexico Power are checked that way. If no sheet was checked, the page shows only the EIA average and says so.

If the tariff total and the EIA average disagree, that is expected. One is a schedule with an effective date. The other is what residential customers paid across 2025. If a line does not match the sheet it cites, the sheet controls. The methodology page lists every checked schedule, the source URL, and the date it was checked. The link under the utility name opens the utility page for the customer count, the annual history, and the counties in the service-territory file.