Home▸Climate, Ecology & Environment▸Carbon Footprint Calculator

🌍 Carbon Footprint Calculator

Estimate your household carbon footprint from electricity, gas, car mileage, flights and diet. See your total tCO2e/year against the UK average and the 2050 climate target.

Climate, Ecology & Environment3DEasy60 FPS

The Model

Annual electricity emissions = monthly kWh × 0.000233 tCO2e/kWh × 12. Annual gas emissions = monthly kWh × 0.000184 tCO2e/kWh × 12 (both approximate UK grid/fuel factors). Car emissions = weekly miles × 0.000254 tCO2e/mile × 52 weeks. Flights = count × 0.15 tCO2e per short-haul return flight. Diet is a lookup: meat-heavy ≈ 3.3 t/yr, average ≈ 2.5 t/yr, vegetarian ≈ 1.5 t/yr, vegan ≈ 1.0 t/yr. All five add up to your total annual footprint in tCO2e.

Benchmarks

The UK average personal footprint is roughly 8.5 tCO2e/year. The Paris-aligned target for 2050 net zero is roughly 2 tCO2e/person/year — the level scientists estimate is compatible with limiting warming to well below 2°C. The chart plots both as dashed reference lines against your own category-by-category bars.

Why tCO2e?

tCO2e (tonnes of CO2 equivalent) converts every greenhouse gas — CO2, methane, nitrous oxide and others — into one common unit based on its warming potential, so a footprint from flights, cattle and gas boilers can be added together and compared on a single scale.

About this simulation

This simulation models a household carbon footprint from five everyday inputs: home electricity, home gas, car mileage, flights, and diet. Each is converted into tonnes of CO2 equivalent (tCO2e) per year using approximate UK emission factors, then summed into a single annual total. The result is compared against the UK average footprint of roughly 8.5 tCO2e/person/year and the 2050 net-zero target of roughly 2 tCO2e/person/year.

🔬 What it shows

Six bars on a price-quantity-style chart: electricity, gas, car, flights and diet emissions, plus a combined Total bar. Two dashed horizontal lines cross the whole chart — red for the UK average, blue for the 2050 target — so you can see at a glance whether your total sits above, below, or near either benchmark.

🎮 How to use

Drag the electricity, gas, car mileage and flights sliders to match your own household, and move the diet slider through its four stops — meat-heavy, average, vegetarian, vegan. The three preset buttons — Low-carbon lifestyle, UK-average lifestyle, High-carbon lifestyle — load ready-made scenarios so you can see the spread instantly.

💡 Did you know?

Diet alone can swing your footprint by more than two tonnes a year — the gap between a meat-heavy diet (≈3.3 t) and a vegan diet (≈1.0 t) is often larger than the entire emissions from a typical car commute. Flights are deceptively cheap-looking per trip but add up fast: six short-haul flights a year adds roughly 0.9 tCO2e, comparable to months of home heating.

Frequently asked questions

What does tCO2e actually mean?

tCO2e stands for tonnes of CO2 equivalent. Greenhouse gases other than CO2 — methane from livestock, nitrous oxide from fertiliser, fluorinated gases from refrigeration — trap heat at different rates, so tCO2e converts each one into the amount of CO2 that would cause the same warming, letting emissions from very different sources (a flight, a cow, a gas boiler) be added on one scale.

Why do electricity and gas use a ×12 and car mileage a ×52?

The sliders ask for typical monthly electricity and gas use and typical weekly car mileage, because that is how most people actually track their bills and driving. Multiplying monthly figures by 12 and weekly figures by 52 simply annualises them so every category in the model is expressed in the same tCO2e-per-year unit before they are summed.

How is the diet factor calculated if it isn't a simple multiplication?

Diet emissions don't scale linearly with a single number the way electricity or mileage do — they depend on the whole pattern of what you eat over a year. Instead the model uses four representative annual totals (meat-heavy, average, vegetarian, vegan) drawn from typical dietary carbon-footprint studies, and the slider simply selects which of the four applies to you.

What is the UK average and where does the 8.5 tCO2e figure come from?

Roughly 8.5 tCO2e/person/year is a commonly cited estimate of the average UK resident's footprint once home energy, transport, flights, diet and a share of public/government emissions are all included. Individual totals vary widely by income, housing, commute and travel habits, which is exactly what the sliders let you explore.

What does the 2050 target of about 2 tCO2e really imply?

Roughly 2 tCO2e/person/year is close to the level scientists associate with a global trajectory consistent with limiting warming to well below 2°C, once the whole world's population and total remaining carbon budget are divided out. For most people in high-income countries today, reaching it means combining lower-carbon electricity, less flying, less driving and a lower-meat diet rather than any single change on its own.

⚙ Under the hood

Estimate an annual household carbon footprint in tCO2e from electricity, gas, car mileage, flights and diet, compared against the UK average (~8.5 tCO2e) and the 2050 Paris-aligned target (~2 tCO2e).

Three.jsCarbon FootprintClimateSustainability

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install