Enter your usage and instantly see how much you’d pay at different electricity rates. Compare real-dollar costs across various price-per-kWh levels. (Estimates supply costs only — excludes delivery fees, taxes, and other charges.)
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Estimated cost
This calculator provides estimates for informational purposes only based on supply costs (usage × rate). Actual electricity bills include additional charges such as delivery fees (TDU/TDSP charges), taxes, utility service fees, and other provider-specific charges that vary by location. Your actual costs may differ. Always review the complete Electricity Facts Label (EFL) from providers for full pricing details before making a decision.
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How Electricity Costs Are Calculated
Understanding how your electricity costs are calculated helps you make informed decisions when comparing rates and providers. The basic formula is straightforward: multiply your monthly usage in kilowatt-hours (kWh) by your electricity rate in cents per kWh, then divide by 100 to convert to dollars.
The formula: Monthly Cost = (kWh × Rate in ¢) ÷ 100
For example, if you use 900 kWh per month and your rate is 12 cents per kWh, your supply cost would be (900 × 12) ÷ 100 = $108 per month. That’s your base electricity supply charge before any additional fees.
This calculator automates this math for you, showing costs at both your current rate and any new rate you’re comparing. The key insight is that even small rate differences compound over time. A rate difference of just 2 cents per kWh on 900 kWh usage equals $18 per month, or $216 annually. That’s why comparing rates before your contract expires or when moving can lead to significant savings.
Keep in mind this calculates supply costs only. Your actual electricity bill includes additional charges like delivery fees, utility service charges, and taxes that vary by provider and location.
What Is a Kilowatt-Hour (kWh)?
A kilowatt-hour (kWh) is the standard unit of measurement for electricity usage. It represents the amount of energy consumed when you use 1,000 watts of power for one hour. Think of it like miles per gallon for your car, but for electricity.
Here are some practical examples to help you understand kWh:
- Running a 100-watt light bulb for 10 hours uses 1 kWh
- A window AC unit running for about 3 hours uses approximately 1 kWh
- Charging your phone completely uses about 0.01 kWh
Your monthly kWh usage appears on every electricity bill, usually in a usage summary section. The average American household uses around 877 kWh per month, but this varies significantly based on home size, climate, and lifestyle. A small apartment might use 500-700 kWh monthly, while a larger home with central air conditioning could use 1,200-1,500+ kWh.
Understanding your kWh usage is essential when shopping for electricity plans because providers structure their pricing around these consumption levels. Some plans offer better rates at higher usage levels, while others are optimized for lower consumption. Always check your average monthly kWh over the past year to get an accurate baseline for comparison shopping.
Common Electricity Billing Mistakes to Avoid
Many electricity customers unknowingly pay more than necessary due to common billing misconceptions and mistakes. Understanding these pitfalls can help you avoid overpaying and make better decisions when comparing electricity plans.
Comparing rates without checking your actual usage. The advertised rate you see is often the price at a specific usage level, typically 500, 1000, or 2000 kWh. If your actual usage differs significantly from these levels, your real rate could be higher. Always check the Electricity Facts Label (EFL) at your specific usage level before committing to a plan.
Ignoring contract renewal dates. Many electricity contracts automatically renew at higher rates when they expire. Set a calendar reminder 30-45 days before your contract ends so you have time to shop for better rates. Forgetting to switch can cost you hundreds of dollars annually.
Focusing only on the per-kWh rate. Your total electricity cost includes more than just the supply rate. Delivery charges (also called TDU or TDSP fees), base charges, and other fees can significantly impact your final bill. Two plans with the same per-kWh rate can have very different total costs once all fees are included.
Not accounting for seasonal usage changes. Your electricity usage likely varies throughout the year, especially if you use air conditioning in summer or electric heating in winter. When using this calculator, consider running scenarios with both your typical usage and your peak seasonal usage to see how rate changes affect you year-round.
Assuming variable rates will stay low. Variable-rate plans can offer attractive introductory pricing, but rates can increase at any time based on market conditions. If you prefer budget stability, fixed-rate plans provide predictable monthly costs. Use this calculator to compare what you’d pay at different rate levels to see your potential exposure to rate increases.
By avoiding these common mistakes and using tools like this calculator to compare actual costs, you can make more informed electricity decisions and potentially save hundreds of dollars per year.