Energy Savings Calculator

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

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.

This calculator works with pounds, inches, kilowatts, watts. You can enter values in the units shown — the calculator handles all conversions internally.

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.