Carbon footprint calculator

Use this tool to estimate the carbon emissions associated with running your home. It focuses on household energy only, so it is useful for planning insulation, heating, solar, and tariff changes.

What is included

  • heating fuel used for space heating and hot water
  • household electricity imported from the grid
  • on-site generation used in the home, such as solar electricity

What is not included

  • flights or other travel
  • food and wider lifestyle spending
  • embodied carbon from manufacturing and construction

Before you start

For the best estimate, use figures from the last 12 months of bills or smart-meter statements. If you have a heat pump, enter the electricity used for heating rather than the amount of heat the system delivers.

Interactive estimator

Enter the energy you buy or use for heating and hot water, in kWh per year.
Use your total home electricity figure before subtracting solar generation.
Optional. Enter the amount of solar or other generation you use on site each year.

How to use the result

Treat the output as a planning figure rather than an audited footprint. The main value is seeing where the largest share of your home’s emissions comes from so you can prioritise the next step.

In many homes:

  • high heating emissions point to insulation and low-carbon heating as the biggest opportunity
  • high grid-electricity emissions point to demand reduction, smarter controls, or solar as the next area to review

Written by NetZeroNow Editorial Team | Last updated on 2026-03-30