Calculators
Home Energy Audit Calculator
Compare home energy upgrades by cost, annual saving and payback, and see the combined effect of doing them all.
- Runs in your browser
- Nothing uploaded
The tool
Enter your numbers below. Results update as you type, and nothing leaves your browser.
Everything you enter stays on your own machine. Nothing is sent to us or to anyone else, which you can confirm in your browser network tab.
What people use it for
- Prioritising home improvements
- Following up a professional energy audit
- Budgeting efficiency upgrades
- Applying for incentive programmes
About this tool
What the Home Energy Audit Calculator does
An energy audit identifies upgrades such as air sealing, insulation, efficient lighting and better controls. Ranking them by simple payback, cost divided by annual saving, shows which to do first. This calculator ranks your list and totals the savings.
Formula
- Payback = cost ÷ annual saving
- Rank upgrades from shortest to longest payback
Worked example
Using the starting values in the calculator above:
| Input | Value |
|---|---|
| Upgrades | 6 entries |
| Current annual energy bill | $3,200 |
| Result | Value |
|---|---|
| Total annual saving | $1,170 |
| Combined payback | 5.5 years |
| Do this first | LED lighting |
| Total cost | $6,470 |
| Share of current bill saved | 36.6% |
How to read the result
Savings from measures interact: after insulating, a new heating system saves less than it would alone. Treat combined totals as an upper estimate.
Seal air leaks before adding insulation; insulation works poorly where air moves through it.
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Questions
Questions about this tool
The things clients actually want to know — costs, timelines, ownership and what happens after launch.
Usually low-cost measures such as LED lighting, air sealing and thermostat controls.
Often a blower door test, thermal imaging and a review of insulation, heating, cooling and appliances.
No. They depend on weather, behaviour and energy prices.
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