Estimate simple payback when a replacement would reduce an ongoing operating cost.
Efficiency Savings Payback Calculator
Formula
How to use the result
Verify energy or operating-cost assumptions for the actual model and usage. Simple payback ignores financing, future price changes and time value of money.
What the calculator does not know
This site does not diagnose faults or provide repair instructions. Stop using items that may be unsafe, recalled, electrically hazardous, fire-damaged, structurally compromised, leaking dangerous substances or otherwise safety-critical, and follow manufacturer, recall-authority and qualified service-professional guidance.
Improve the estimate
Keep the inputs used for the decision and compare the estimate with actual results. A simple calculator is most useful when it makes the assumptions visible enough to learn from the difference.