About the Energy Savings Calculator
Savings from an efficiency upgrade, with payback period and lifetime return.
Also known as: efficiency savings calculator, energy upgrade payback, insulation savings, appliance upgrade savings.
How to use this calculator
- Enter current annual energy, expected reduction, cost per kwh, cost of the upgrade and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
saving = current use × reduction % × rate
Worked example
Using the values pre-filled in the calculator above:
- Current annual energy = 4,000 kWh
- Expected reduction = 25 %
- Cost per kWh = 0.28
- Cost of the upgrade = 2,500
- Expected lifetime = 15 years
- Annual energy price rise = 4 %
the calculator returns:
- First-year saving: 280
- Energy saved per year: 1,000 kWh
- Simple payback: 8.93 years
- Lifetime saving: 5,606.6