Carbon Emission Reduction Calculator

Turn recovered energy into avoided CO2. Enter the annual energy saved (or the duty) and your grid emission factor to get tonnes CO2e per year and easy-to-communicate equivalences.

Why this matters for tenders

Recovered heat displaces boiler or electric heating that would have burned fuel. At a typical 0.55 kgCO2/kWh grid factor, every 1 MWh/yr avoided is about 0.55 tCO2e. ESG reports, LEED/carbon credits and green-building tenders all count this — pair the number with our payback tool to show both the carbon and the cash case.

Frequently asked questions

Which emission factor should I use?

Use your local grid average. China coal-heavy grids run ~0.8–0.9; the EU average is ~0.25; a renewable-powered site approaches 0. Check your utility's published figure.

Are the tree/car equivalences accurate?

They are rules of thumb: 1 tree absorbs ~21 kg CO2/yr; an average car emits ~4.6 tCO2/yr. They communicate scale, not a certified offset.

Does recovery also cut cooling CO2?

Yes — in summer an ERV pre-cools incoming air, cutting compressor work and its emissions by the same energy maths. The calculator assumes one duty per year; sum heating and cooling savings for a full year.