LED Savings Calculator
Calculate annual electricity savings and simple payback from LED replacements.
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Currency: Amounts are calculated in the currency you select; this site does not convert between currencies and does not use live exchange rates.
What this tool does
Calculate annual electricity savings and simple payback from LED replacements. Excludes maintenance cost and lamp lifetime; negative savings means the replacement uses more electricity.
How to use the LED Savings Calculator
- Enter or select existing watts per lamp.
- Enter or select led watts per lamp.
- Enter or select lamp count.
- Enter or select hours per day.
- Enter or select price per kwh.
- Enter or select total replacement cost.
- Read the calculated result; change any measurement to compare alternatives.
Formula
annual saving=(old−new)×count×hours×365/1000×rate; payback=replacement cost/annual saving
- old
- Existing watts per lamp
- new
- LED watts per lamp
- count
- Lamp count
- hours
- Hours per day
- rate
- Price per kWh
- cost
- Total replacement cost
Excludes maintenance cost and lamp lifetime; negative savings means the replacement uses more electricity.
Worked example
For led savings calculator, the following measurements illustrate the exact method: Existing watts per lamp: 60; LED watts per lamp: 9; Lamp count: 10; Hours per day: 4; Price per kWh: 0.16; Total replacement cost: 50.
Inputs
- Existing watts per lamp60
- LED watts per lamp9
- Lamp count10
- Hours per day4
- Price per kWh0.16
- Total replacement cost50
Result
- Annual energy savings$119.14
- Payback (years)0.42
Results explained
- Annual energy savings
- Annual energy savings from the formula above. Excludes maintenance cost and lamp lifetime; negative savings means the replacement uses more electricity.
- Payback (years)
- Payback (years) from the formula above. Excludes maintenance cost and lamp lifetime; negative savings means the replacement uses more electricity.
Frequently asked questions
annual saving=(old−new)×count×hours×365/1000×rate; payback=replacement cost/annual saving
Excludes maintenance cost and lamp lifetime; negative savings means the replacement uses more electricity.
No. Electrical and HVAC results are estimates. Installation must comply with local codes and be checked by a qualified licensed professional.
Nameplate values, conductor temperature, power factor, efficiency, weather and actual installation conditions may differ from your entered assumptions.
Confirm units, manufacturer data and the formula's assumptions, then verify sizing with the equipment instructions and applicable local standards.