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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.

公式

Annual savings = (Old kWh − New kWh) × Price per kWh | Payback period = Upgrade cost / Annual savings

ステップバイステップガイド

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

解いた例

入力

Replace 100W bulb with 10W LED, 6h/day, $0.30/kWh

結果

Annual saving = 90W × 6h × 365 × $0.30/1000 = $59.13

よくある質問

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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