Energy Savings ROI Calculator

Calculate the payback period and ROI for energy efficiency upgrades like insulation, windows, appliances, and solar panels.

Inputs

Upgrade Cost

Monthly Energy Savings

Annual Utility Rate Increase

Rebate / Incentive Amount

Expected Lifespan

years

Tab to move between fields

Results

Payback Period

54 months

10-Year Net Savings

$6,505.32

≈ 7 smartphones

Net Cost After Rebate$4,500.00

Annual Savings (Year 1)$960.00

10-Year ROI144.6%

How to Use This Calculator

Enter the full Upgrade Cost and any Rebate or Incentive amount to find the net cost after rebates.
Enter your Monthly Energy Savings from the upgrade and the Annual Utility Rate Increase.
Enter the Expected Lifespan in years for the energy improvement.
Review the Payback Period in months and 10-Year Net Savings to assess long-term value.
Check 10-Year ROI to compare this upgrade against other investments or savings options.

How the result changes with Upgrade Cost

Upgrade Cost	Payback Period	10-Year Net Savings
$10,000.00	106 months	$1,505.32
$35,000.00	0 months	-$23,494.68
$65,000.00	0 months	-$53,494.68
$90,000.00	0 months	-$78,494.68

What each input means

Upgrade Cost: Total cost of the energy efficiency upgrade.
Monthly Energy Savings: Estimated monthly savings on your energy bill.
Annual Utility Rate Increase: Expected annual increase in utility rates (historical avg ~3%).
Rebate / Incentive Amount: Tax credits, rebates, or incentives that reduce your upfront cost.
Expected Lifespan: How many years the upgrade is expected to last.

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Upgrade Cost = 5000, Monthly Energy Savings = 80, Annual Utility Rate Increase = 3, Rebate / Incentive Amount = 500 = 5 input(s) provided
Calculate Payback Period
54 = 54
Calculate 10-Year Net Savings
10-Year Net Savings
6505.32 = $6,505.32
Calculate Net Cost After Rebate
Net Cost After Rebate
4500 = $4,500
Calculate Annual Savings
Annual Savings
960 = $960

Engine last updated July 28, 2026.

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