Insulation Payback Calculator

Home insulation reduces heat loss, cutting heating bills and carbon emissions. Loft insulation typically pays back within 1-3 years and is the highest-ROI home energy improvement

The calculator uses the standard published formula for insulation payback. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: Payback period = Installation cost / Annual energy saving. Each step in the calculation is shown so you can verify the result manually.