How to read your electricity rate and estimate a bill
Find the true price per kWh on your bill, watch for fixed and tiered charges, and turn appliance wattage into a monthly cost.
Finding your real price per kWh
The single number this calculator needs is your price per kilowatt-hour, but bills rarely make it obvious. Look for a line called the energy charge, supply rate or unit price, usually shown in cents or dollars per kWh. If your plan lists several components, add the per kWh parts together, since generation and delivery are often billed separately. The most reliable check is to take the total kWh used from the bill and divide the bill amount by it, which gives your true blended rate including any extras.
Fixed charges and tiered rates
A flat rate per kWh is only part of the story. Many providers add a fixed daily or monthly connection charge you pay no matter how little you use, so a low usage month still carries a base cost. Tiered plans raise the price once you pass a threshold, meaning the last kWh of a heavy month can cost more than the first. Time of use plans go further and change the rate by hour of day. This tool models a single flat rate, so for those plans enter the rate for the block of usage you care about and treat the result as an estimate.
From appliance watts to daily kWh
To estimate what a device costs, first turn its power into energy. Multiply the wattage by the hours it runs, then divide by 1000 to get kilowatt-hours. A 1500 watt space heater run for 4 hours uses 1500 x 4 / 1000 = 6 kWh a day. Feed that into the calculator with your rate and tick daily usage to see the monthly and yearly weight of that one appliance. Repeat for the big loads, heating, cooling, water heating and laundry, and you can rank where your money actually goes.
Cutting the cost you find
Once a number has a price tag, savings get concrete. Running the heavy loads during off peak hours on a time of use plan, swapping incandescent bulbs for LEDs, and trimming standby draw all lower the kWh total that this calculator multiplies. Even a small rate difference compounds: at $0.30 per kWh, 10 kWh a day works out to $1,095 a year, while the same use at $0.15 halves that to about $547. Because monthly and yearly figures scale straight from the daily cost, any daily saving multiplies by 365 over a year.