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Energy & Sustainability

Carbon Footprint Calculators & Guides

Translate kilowatt-hours, kilometres, kilograms and litres into CO₂ — with emission factors you can verify.

A carbon footprint is not a single number — it is a stack of small conversions, each one turning a bill or a shopping receipt into kilograms of CO₂. This hub explains those conversions transparently: what emission factor to use for grid electricity in your region, how to compare food categories, why petrol vs EV emissions depend heavily on the grid, and where water footprint fits in.

The math here draws on published sources — IEA and national grid operators for electricity CO₂ intensity, Poore & Nemecek (2018) for food emissions, IPCC AR6 for global warming potentials. Every guide cites the factors it uses so you can substitute your own regional data if you have it.

Carbon calculations are most useful when they change a decision: what to eat this week, whether to fly or take the train, whether the extra cost of a heat pump is worth it in your grid. Cross-linked pillars help you connect that decision to concrete calculators and tariffs.

Flagship calculator · Free

Carbon Footprint Calculator

Full personal CO₂ audit across electricity, heating, driving, flights, diet and goods — with country-specific grid factors and a 1.5 °C pathway benchmark.

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Guides in this hub

In-depth articles covering the math, the assumptions, and the practical decisions for carbon footprint.

Green Earth with CO2 molecules representing carbon footprint awareness
🌱Energy & Environment

How to Calculate Your Carbon Footprint

Your carbon footprint is the total amount of greenhouse gases you produce. Understanding and calculating it is the first step to reducing your environmental impact. This guide breaks down the major emission sources and how to measure them.

Electric power lines against blue sky representing CO2 emissions from electricity
🌱Energy & Environment

How to Calculate CO₂ Emissions from Electricity

Understanding how much CO₂ your electricity use produces is essential for reducing your carbon footprint. However, the answer varies dramatically depending on where you live and how your electricity is generated. This guide explains how to calculate your electricity emissions.

Fresh vegetables and plant-based foods representing low carbon diet options
🌱Energy & Environment

How to Calculate Your Food Carbon Footprint

What you eat matters for the planet. Food production accounts for 26% of global greenhouse gas emissions. This guide helps you understand which foods have the biggest impact and how to reduce your dietary carbon footprint without sacrificing nutrition.

Various transport modes including train, plane, car and bicycle showing emission comparison
🌱Energy & Environment

Transport Carbon Footprint: Complete Mode Comparison

How you travel has a massive impact on your carbon footprint. A single flight can emit more CO₂ than a year of driving. This guide compares all major transport modes and helps you make greener travel choices.

Water droplet with green leaf symbolizing sustainable water conservation
🌱Energy & Environment

Understanding Your Water Footprint: Complete Conservation Guide

Water scarcity affects over 2 billion people worldwide, yet the average person uses far more water than they realize—most of it hidden in the products they consume. This guide explains water footprints, reveals surprising water costs of everyday items, and provides practical conservation strategies.

Supporting converters

General-purpose unit converters you will use alongside the guides above — area for panel sizing, temperature for heat pumps, distance for EV range.

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kg → lb

Kilograms to Pounds

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lb → kg

Pounds to Kilograms

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mi → km

Miles to Kilometers

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gal → L

Gallons (US) to Liters

More calculators in this hub

Focused tools that answer a single question — pair them with the flagship calculator for deeper analysis.

Electricity CO₂ Calculator

Convert kWh to kg CO₂ using 20+ country grid intensities, with cross-country ranking bar.

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Flight vs Train CO₂

Compare 9 transport modes (flight, HSR, coach, solo car, shared car, EV) for any route.

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Frequently asked questions

How much CO₂ does 1 kWh of electricity produce?
It depends entirely on your grid. Norway: about 20 g CO₂/kWh (mostly hydro). France: 60–90 g (nuclear-heavy). UK: 180–250 g. Germany: 350–450 g. Poland: 650–750 g (coal-heavy). US average: about 380 g. Use your national grid operator’s live data for accuracy — the difference across countries is more than 30×.
What is a typical household carbon footprint?
European average: 6–10 tonnes CO₂e per person per year. US average: 15–18 tonnes. Global average: about 4.7 tonnes. To align with a 1.5 °C climate pathway, individual footprints need to reach roughly 2 tonnes/year by 2030.
Is beef really that much worse than chicken?
Yes. Poore & Nemecek (2018): beef averages 60 kg CO₂e per kg of edible product; chicken 6–10 kg; pork 7–12 kg; lentils under 1 kg. Beef’s footprint is roughly ten times chicken and 60 times lentils per kg, driven by methane from ruminant digestion and feed conversion efficiency.
How much CO₂ does a flight produce?
A short-haul economy flight emits roughly 150–250 g CO₂e per passenger-km including radiative forcing. Long-haul is slightly lower per km (200 g). A return London–New York flight is 1.5–2 tonnes per person — often more than a year of home electricity in Europe.
Are EVs really cleaner than petrol cars?
Over a typical 15-year lifetime, yes — even on today’s European grid mix, EVs emit 40–70% less CO₂ per km than petrol equivalents when manufacturing is included. In grids under 300 g CO₂/kWh, EVs pay back their manufacturing emissions within 15,000–30,000 km. In coal-heavy grids the advantage narrows but does not disappear.
Where do I find reliable emission factors?
For electricity: IEA, national grid operators (National Grid ESO, RTE, Statnett), or electricityMap. For food: Poore & Nemecek (2018) Science paper. For fuels: IPCC AR6 tables. For products: manufacturer EPDs (Environmental Product Declarations) where available. Every article in this hub cites the factor it uses so you can substitute newer data as it appears.

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