How much CO₂ does your home emit? How much would you save with solar panels? Which countries emit the most, and what does a tonne of carbon cost on the European market? We've gathered all of the CO₂ Library's free CO₂ tools on one page: calculators, interactive maps, simulators and a knowledge quiz.
Pick the one you need. They all run directly in your browser, with no sign-up.
Footprint and savings calculators
- Renewable energy CO₂ calculator: enter your consumption in kWh and see how much CO₂ you save by switching from coal or gas to solar or wind.
- Detailed carbon footprint calculator: calculate your household's annual footprint by category (electricity, heating, travel, flights), with country selection.
- Emission benchmark tool for businesses: calculate your carbon intensity per €1m revenue, employee, m² or output unit, compare it with your sector benchmark and see a 1.5°C-aligned path to 2030.
For the method behind sector comparisons, see our guide to carbon benchmarking.
Carbon markets and the EU ETS
- EU carbon price and electricity costs: live Ember charts of the carbon cost in gas and coal power since 2018, by country, with a guide to how the EUA price reaches your bill.
- EU ETS auction simulator: bid against simulated competitors under the real rules: one uniform clearing price, lots of 500 allowances and possible cancellation.
- EUA fair value calculator: find the EUA price at which gas power beats coal, and the fair value of EUA futures.
- Carbon cost forecasting tool: estimate your EU ETS allowance costs year by year to 2035, with low, base and high EUA price scenarios and the CBAM phase-out of free allocation.
- EU ETS emissions and allowances by country: the official European Environment Agency viewer with verified emissions, free allocation and surrendered allowances by country, sector and year.
- EU ETS Dashboard: emissions, cap, auctions and free allowances since 2005, with a sector breakdown and an installation map.
- EU ETS scenario simulator: change the EUA price, growth or free allocation and see emissions, the cap and revenue up to 2030.
New to the EU ETS? Start with the EU Emissions Trading System explained.
Data, maps and charts
- Global CO₂ emissions by country: an interactive map with year selection, country rankings and statistics, with a guide to reading the data.
- CO₂ emissions per capita and historical shares: a map of emissions per person, emissions versus population, and each country's share of global emissions since 1750.
- Emissions dashboard for businesses (example): see how a company can track its emissions against targets by region and year, with sample data and a guide to building your own.
- Global temperatures: see how the planet's temperature has changed over the years.
- Climate Watch: national plans (NDCs) and emissions: explore countries' commitments under the Paris Agreement and their historical emissions, with data from the Climate Watch platform.
- Greenhouse gas projections by country (EEA): member states' official projections of their emissions by sector and policy scenario.
To understand what countries' commitments mean, read about the Paris Agreement and CO₂ emissions.
Test your knowledge
- Carbon literacy quiz: test what you know about CO₂, greenhouse gases, the EU ETS and carbon markets.
How to get the most out of these tools
- Measure: start with a footprint calculator to see where you stand.
- Compare: see how you compare with the average, or how your country compares with others.
- Act: use the renewable energy calculator to see how much solar panels or a green tariff would cut your footprint.
For the terms you'll come across, check our CO₂ Term Glossary. Missing a tool? Tell us what you'd like to calculate.