// multi-utility computation suite · offline · instant · precise
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env.energy-savings Calculator
Calculates annual energy cost savings from upgrading to a more efficient appliance, insulation, or system, and shows the payback period in years. The simple payback period is the first filter most homeowners use for retrofit decisions.
Inputs
Old Kwh
Reference formula or conversion factor shown for context.
New Kwh
Reference formula or conversion factor shown for context.
Rate
Amount per unit of time or per unit quantity. Check the denominator before interpreting.
Upgrade Cost
Reference formula or conversion factor shown for context.
Results
annual savings (kWh)
Total money or resources saved compared to the baseline or alternative scenario.
annual savings ($)
Total money or resources saved compared to the baseline or alternative scenario.
simple payback
Reference formula or conversion factor shown for context.
CO₂ avoided (t/yr)
Reference formula or conversion factor shown for context.
10-year savings
Total money or resources saved compared to the baseline or alternative scenario.
efficiency gain
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.