Energy Efficiency Upgrade Payback Calculator
Calculate how many years it takes an energy-efficient appliance or upgrade to pay for itself through lower electricity bills.
Your results
Calculation breakdown
- Payback
- Payback (years) = extra upfront cost / annual saving
Worked example
An efficient appliance costing $300 more than the standard option, saving $60 a year in energy, pays for itself in 5 years and nets about $300 over 10 years.
Assumptions
- Assumes a flat annual saving; rising electricity prices would shorten the real payback period.
- Use the price difference versus a standard alternative, not the full purchase price.
- Does not account for maintenance, lifespan differences or financing costs.
How this calculator works
Enter the extra upfront cost of a more energy-efficient option, the annual energy saving it delivers and your discount assumption to calculate the simple payback period in years. This helps compare upgrades like efficient light bulbs, better insulation or a new appliance against their sticker price premium.
Frequently asked questions
What counts as the 'extra cost'?
Use the price difference between the efficient option and the standard alternative, not the full purchase price, for a fair payback comparison.
What if the payback period is longer than the product's life?
In that case the upgrade may not pay for itself financially, though it could still reduce emissions or provide comfort benefits worth considering.
Does this account for rising electricity prices?
The basic payback figure assumes a flat annual saving; a rising electricity price would shorten the real payback period.
Actual prices, usage, efficiency and savings vary by provider, equipment, location and behaviour.