Electric Bill Percentage Change Calculator: How Much Higher This Month
Work out the percentage change between two electric bills — how much your bill has risen or fallen, in percent and in dollars.
Adjust the inputs and select Calculate for a full breakdown.
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | Bill change | Dollar change |
|---|---|---|
| $120 to $144 | 20.00% | 24 |
| $80 to $95 | 18.75% | 15 |
| $200 to $180 | -10.00% | -20 |
| $60 to $75 | 25.00% | 15 |
How This Calculator Works
Enter the previous bill and the current bill. The calculator subtracts one from the other for the dollar change and divides by the previous bill for the percentage. For a fair comparison, use the same month a year apart — same season, same daylight hours, same heating or cooling load.
The Formula
Percentage Change
Old is the starting value, New is the ending value
Worked Example
An electric bill rising from $120 to $144 is a 20% increase — $24 more this month. If both months had similar weather, the increase is mostly rate-driven; if the new month was hotter or colder, the increase blends rate changes with higher consumption.
Key Insight
Electric bills change for three reasons: rate changes (the cost per kWh), consumption changes (how many kWh you used), and fixed-charge changes (monthly meter or service fees). The headline percentage bundles all three. To isolate the rate component, divide the bill by kWh used and compare those per-kWh rates — that figure reveals whether your utility raised prices or you simply used more.
Frequently Asked Questions
How is electric bill percentage change calculated?
Subtract the previous bill from the current bill, divide by the previous bill, and multiply by 100. A $120 to $144 move is a 20% increase.
Why did my electric bill increase?
Three possibilities: rate increase (cost per kWh went up), higher consumption (more usage), or higher fixed charges (delivery and service fees). Compare the per-kWh rate on the bill to separate the three.
Should I compare month-over-month or year-over-year?
Year-over-year (same month) is fairer because it removes seasonal swings. Month-over-month combines rate changes with seasonal consumption changes, making it harder to interpret.
What is a normal annual increase?
US residential electric rates have historically risen 2% to 4% a year, with bigger swings in markets that rely on natural gas for power generation. Increases above 10% year-over-year often signal a rate case or a major fuel cost shift at the utility.
How can I lower the increase?
Compare per-kWh rates on competing plans (in deregulated markets), tighten consumption (LED lighting, smart thermostat, sealed windows), and review fixed charges — some utilities offer reduced-fee plans for low usage.
Related Calculators
Methodology & Review
The change is the new bill minus the old bill, divided by the old bill, expressed as a percentage. Comparing same-month-year-over-year removes seasonal swings; comparing consecutive months captures rate changes plus seasonal effects together.
Written by Ugo Candido · Last updated May 17, 2026.