Energy Saving Estimator
Estimate annual bill savings when replacing a device with a more efficient model.
About this tool
Estimate annual bill savings when replacing a device with a more efficient model. Enter the values shown with consistent units. The calculator applies the formula stated by its inputs and computes the estimate locally in your browser. It does not read external records, verify measurements, or substitute for professional advice. Review the assumptions and units before using the result for a purchase, plan, invoice, project, or other consequential decision.
How to use this tool
- Enter values in the labeled fields.
- Use consistent units and check any percentage assumptions.
- Calculate and review the result before applying it.
How it works
The calculator validates each supplied number and applies this formula: (oldWatts - newWatts) / 1000 * hours * days * rate.
When to use this tool
- Producing a quick planning estimate from known inputs.
- Checking a calculation without uploading values or opening a spreadsheet.
Limitations
Energy Saving Estimator is a planning calculator. It does not validate external records, physical measurements, changing rates, or local regulations.
Privacy
The values you enter in Energy Saving Estimator remain in browser memory and are not uploaded by this calculator.