Most people never read past the amount due. But the bill holds the one number you need to estimate any appliance’s cost — and a map of where your money goes.
Use this with how to read your electric bill and the calculator.
Step 1: find your effective rate
Don’t trust the advertised “supply rate.” Your real, all-in rate is:
| Formula | total bill ÷ kWh used |
| Example | $150 ÷ 900 kWh = 16.7¢/kWh |
That effective rate folds in delivery charges, the fixed monthly customer charge, and taxes — so it’s higher than the supply rate alone. It’s the number to plug into any running-cost estimate.
Step 2: understand the line items
- Energy / supply charge — the electricity itself, per kWh.
- Delivery / transmission — the wires to your home, per kWh (often 30–50% of the total).
- Customer / service charge — a fixed monthly fee (~$5–$25) you pay regardless of use.
- Taxes & fees — state and local add-ons.
Step 3: target the big loads
Cutting the bill means cutting kWh on the biggest users, not the phone chargers:
| Move | Why it works |
|---|---|
| Lower heating/cooling setpoints | HVAC is the largest load in most homes |
| Heat-pump water heater | Uses ~⅓ of a resistance tank |
| Shift EV charging off-peak | Same miles, cheaper kWh |
| Replace a pre-2001 fridge/freezer | Old units use far more |
Step 4: shop your rate (if you can)
In deregulated states you can switch the supply portion to a cheaper provider; delivery stays with your utility. Compare your state’s typical rate on the state pages to see whether you’re paying above the local average.
Bottom line
Find your effective ¢/kWh (total ÷ kWh), then attack the loads that are both high-power and long-running. Estimate any appliance at your real rate in the calculator, and see what uses the most electricity.