Energy Savings Calculator
Old Appliance Wattage
New Appliance Wattage
Hours per Day
Rate ($/kWh)
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.
- 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
Replace 100W bulb with 10W LED, 6h/day, $0.30/kWh=Annual saving = 90W × 6h × 365 × $0.30/1000 = $59.13
| Upgrade | Annual saving | Typical payback |
|---|---|---|
| LED lighting (per bulb) | $20–60/yr | < 1 year |
| Smart thermostat | $130–150/yr | 1–2 years |
| Efficient fridge | $50–100/yr | 4–6 years |
| Solar panels | $800–1,500/yr | 6–10 years |
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