The Home Energy Savings Calculator
Five worked formulas that turn your own utility bill into a ranked list of what to fix first.
What is inside
- Step 1, find your true cost per kilowatt-hour, including the line items people forget to divide back in
- Step 2, cost out what any single device runs you, per month and per year
- Step 3, value a lighting swap using your own fixtures and your own run hours
- Step 4, find the always-on load, the draw that continues while nobody is home
- Step 5, calculate payback period, so a purchase becomes a number instead of a feeling
- How to rank your projects once every candidate has a figure next to it
- How to measure heating and cooling rather than assuming what it costs
- Free adjustments to run before you buy anything at all
Send me the calculator
Enter your email and your download opens immediately. A copy goes to your inbox too.
Arithmetic on your bill beats a claim on a box
Every energy product arrives with a savings claim, and every claim is built on somebody else’s house, rates and habits. Yours are different. This calculator does not tell you what you will save. It hands you the formulas and shows the arithmetic worked all the way through, so you can drop in your own rate, your own run hours and your own fixtures and get a figure that belongs to your home. That is the difference between a marketing number and a measurement.
The ranking usually surprises people
Once every candidate project has a number beside it, the list sorts itself, and the order is rarely the one you expected walking in. The biggest line on the bill is frequently not the thing you were about to buy, and something unglamorous that runs quietly all day tends to outrank the device that looked like the obvious upgrade. That is the entire point of ranking before spending. The list decides, not the product page.
Measure the big loads, and try the free changes first
Heating and cooling is usually the largest single category in a home, and it is also the one people estimate rather than measure. The calculator walks you through getting a real figure for it instead of a guess. It also front loads the adjustments that cost nothing: schedules, setbacks, run times, and the things that stay powered when the house is empty. Make those changes, read the next bill, and then decide what is genuinely worth buying.
Enter your email in the form above and the calculator is yours as a PDF. Bring your most recent utility bill and you can work through step one straight away.