How to Calculate Energy Savings
What is Energy Savings?
Energy savings calculators quantify annual electricity cost reductions from replacing an inefficient device with a more efficient one. LED bulbs and smart thermostats have among the fastest paybacks.
Formula
Step-by-Step Guide
- 1Annual saving = (Old W − New W) / 1000 × Hours/day × 365 × Rate
- 2Payback period = Upgrade cost / Annual saving
- 3CO₂ saving = kWh saved × grid carbon intensity
- 4Energy savings are effectively inflation-protected as prices rise
Worked Examples
Frequently Asked Questions
What is Energy Savings?
Energy savings calculators quantify annual electricity cost reductions from replacing an inefficient device with a more efficient one. LED bulbs and smart thermostats have among the fastest paybacks
How accurate is the Energy Savings calculator?
The calculator uses the standard published formula for energy savings. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.
What units does the Energy Savings calculator use?
This calculator works with pounds, inches, kilowatts, watts. You can enter values in the units shown — the calculator handles all conversions internally.
What formula does the Energy Savings calculator use?
The core formula is: Annual saving = (Old W − New W) / 1000 × Hours/day × 365 × Rate. Each step in the calculation is shown so you can verify the result manually.
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