Question 1

How do I estimate my electricity bill?

Accepted Answer

Add up the kWh your home uses each month, multiply by your electricity rate in dollars per kWh, then add the fixed monthly service charge. This calculator splits usage into major categories — heating and cooling, water heating, EV charging, and everything else — so you can see the total and what's driving it. Heating, cooling, and water heating typically make up the largest share.

Question 2

Where do I find my electricity rate and fixed charge?

Accepted Answer

Both are printed on your utility bill. The rate is in dollars (or cents) per kWh — sometimes split into supply and delivery lines you add together. The fixed charge is a flat monthly connection or service fee, often $5–$20, billed regardless of how much you use. If you don't have your bill handy, pick your state to fill in the average residential rate, then adjust.

Question 3

How many kWh does each category use per month?

Accepted Answer

It varies by home, climate, and equipment, but rough US ballparks: heating and cooling can run 300–800+ kWh in peak months, electric water heating 200–400 kWh, an EV around 250–400 kWh for typical commuting, and the remaining appliances, lighting, and electronics another 200–400 kWh. Check your bill's usage history for your own numbers — many utilities show monthly kWh online.

Question 4

Why is my actual bill different from the estimate?

Accepted Answer

Real bills shift with the seasons — heating and cooling swing the most — and may include tiered rates, time-of-use pricing, taxes, or demand charges this simple model doesn't break out. Use the estimate to see what's driving cost and to compare scenarios, then verify against your actual bill for an exact figure.

Electricity Bill Calculator

Frequently asked questions

Related guides

Related calculators

Home Energy Score Calculator

Mini Split Sizing Calculator

Heat Pump Cost Calculator

Heat Pump Payback Calculator

Sources & standards