Formula
kWh per day = watts × hours ÷ 1,000. Cost = kWh × price per kWh. Monthly cost uses 30.42 days (365 ÷ 12). Find watts on the device label or charger; for the real draw, measure it.
Measure instead of guessing. Appliance labels show maximum watts; real use is often lower. A plug-in electricity usage monitor shows actual watts and kWh. See plug-in energy monitors on Amazon. As an Amazon Associate I earn from qualifying purchases.
Average price by state
| State | ¢/kWh (Aug 2026) |
|---|---|
| Alabama | 16.33 |
| Alaska | 29.41 |
| Arizona | 15.05 |
| Arkansas | 14.37 |
| California | 29.75 |
| Colorado | 17.17 |
| Connecticut | 24.51 |
| Delaware | 18.7 |
| District of Columbia | 25.98 |
| Florida | 14.99 |
| Georgia | 15.9 |
| Hawaii | 47.18 |
| Idaho | 13.37 |
| Illinois | 19.32 |
| Indiana | 17.02 |
| Iowa | 17.06 |
| Kansas | 15.47 |
| Kentucky | 13.8 |
| Louisiana | 12.87 |
| Maine | 32.11 |
| Maryland | 21.4 |
| Massachusetts | 30.48 |
| Michigan | 22.99 |
| Minnesota | 17.2 |
| Mississippi | 14.43 |
| Missouri | 16.02 |
| Montana | 15.57 |
| Nebraska | 13.54 |
| Nevada | 12.72 |
| New Hampshire | 27.64 |
| New Jersey | 24.61 |
| New Mexico | 16.51 |
| New York | 28.65 |
| North Carolina | 14.95 |
| North Dakota | 13.31 |
| Ohio | 19.38 |
| Oklahoma | 14.82 |
| Oregon | 15.92 |
| Pennsylvania | 21.77 |
| Rhode Island | 28.18 |
| South Carolina | 15.76 |
| South Dakota | 15.15 |
| Tennessee | 13.42 |
| Texas | 15.91 |
| Utah | 13.31 |
| Vermont | 23.84 |
| Virginia | 17.64 |
| Washington | 14.63 |
| West Virginia | 16.31 |
| Wisconsin | 19.41 |
| Wyoming | 14.43 |
Source: U.S. Energy Information Administration, Electric Power Monthly, Table 5.6.A (average residential price, August 2026, preliminary; released October 23, 2026). Your utility bill rate may differ.
Related tools
Frequently asked questions
How much does 1,000 watts cost per hour?
1 kWh. At the US average of 18.16¢/kWh, about $0.18 per hour.
Where do I find my rate?
On your utility bill: divide the energy charge by kWh used, or use your state average.