Ecological footprint: definition, calculator and how to reduce it

What is an ecological footprint? Definition

The ecological footprint is an indicator that measures the biologically productive area — expressed in global hectares (gha) — that a person, a city or a country needs to produce the resources it consumes and absorb the waste it generates. The concept was created in 1990 by Mathis Wackernagel and William Rees and is calculated today by the Global Footprint Network.

Also called the environmental footprint, it is used internationally as a sustainability indicator to measure the impact of our habits on the planet. The concept rests on three observations:

• Producing any good or service requires a flow of materials and energy that comes from ecological systems;
• From production to end of life, those goods and services need ecological systems to absorb the waste generated;
• Producing goods and services occupies physical space — infrastructure, housing, equipment — which reduces the land available to ecological systems.

When the ecological footprint of a territory exceeds its biocapacity, that territory lives on ecological credit. This is exactly what is happening at global level: humanity currently demands 73% more than ecosystems can regenerate — the equivalent of 1.7 planet Earths, according to the Global Footprint Network (2026).

Ecological footprint calculator: how to measure yours

The easiest way to estimate your personal impact is to use a free ecological footprint calculator. The reference tool is the official Global Footprint Network calculator: after a short questionnaire, it returns your footprint in global hectares, your personal overshoot day and the number of planets we would need if everyone lived like you.

The questionnaire covers the main drivers of your footprint:

• Food: how often you eat animal products and how much of your food is local or unprocessed;
• Housing: the size and type of your home, its energy efficiency and whether it runs on renewable energy;
• Transport: how far you travel by car, public transport and plane each year;
• Consumption and waste: how much you buy and how much of your waste is recycled or composted.

How is the ecological footprint calculated?

Behind every calculator, the method compares two factors:

1. The planet’s biocapacity, i.e. its capacity to generate renewable resources and absorb waste;
2. Human activity, i.e. the resources consumed by people and the waste they produce.

The calculation adds up all the biologically productive area a lifestyle demands — cropland, grazing land, forests, fishing grounds, built-up land and the forest area needed to absorb CO2 emissions — and expresses the result in global hectares (gha): hectares with world-average biological productivity. According to Global Footprint Network data, the average footprint worldwide is around 2.6 gha per person, while available biocapacity is only about 1.5 gha per person. Differences between countries are huge: the average American needs 8.1 gha and the average Qatari more than 14 gha.

At global scale, the result of this calculation shows that the planet’s capacity to meet the needs of its inhabitants is insufficient. We consume more resources and produce more waste than the biosphere can regenerate and absorb, compromising the sustainable development of future generations.

Ecological footprint vs carbon footprint: what is the difference?

The carbon footprint, calculated in tonnes of CO2 equivalent, only takes into account the greenhouse gases emitted by an activity. The ecological footprint is a broader indicator: it includes every aspect of your lifestyle — food, housing, mobility, consumer goods, waste — whether or not it emits greenhouse gases. In fact, the carbon footprint is a component of the ecological footprint: it represents about 60% of humanity’s ecological footprint and is its fastest-growing part, according to the Global Footprint Network.

Both sustainability indicators help raise awareness of our environmental impact and encourage people to act against global warming by cutting their greenhouse gas emissions.

Ecological footprint around the world: 2026 data

Not all countries put the same pressure on the planet. A country’s ecological footprint is calculated from that of its inhabitants, and the most striking way to compare them is each country’s overshoot day.

Earth Overshoot Day 2026

Every year, Earth Overshoot Day marks the date by which humanity has consumed all the resources the planet can regenerate in a year. In 2026 it fell on 30 July, according to the Global Footprint Network announcement published on 5 June 2026 — the highest level of global overshoot ever recorded.

The long-term trend is clear: based on the recalculated historical series of the 2026 edition of the National Footprint and Biocapacity Accounts, the date fell on 29 November in 1980, 23 September in 2000 and 15 August in 2010. For roughly five months a year, humanity now lives on ecological credit: depleting local reserves and accumulating CO2 in the atmosphere.

Country overshoot days: who consumes the most?

If everyone lived like a resident of Qatar, the country with the largest footprint per person, the planet’s annual resources would run out on 4 February: we would need more than 10 planets. The United States follows with an overshoot day on 14 March (5 planets), while Italy (3 May) and the United Kingdom (22 May) sit around 3 and 2.6 planets. At the other end of the scale, India and the Philippines have no overshoot day at all: if everyone consumed like their inhabitants, humanity would use less than one Earth, according to the Country Overshoot Days 2026.

These gaps mirror the ranking of the most polluting countries: high-income economies exhaust their share of the planet’s budget within months, while lower-income countries stay within it all year. The UK, for instance, still consumes far more resources than its own territory can produce — its footprint is several times its domestic biocapacity.

How to reduce your ecological footprint?

A large share of the ecological footprint comes from the carbon emissions of human activity. In fact, an individual’s ecological footprint depends directly on their lifestyle: what they eat, how they travel, how much energy they use and how much waste they generate.

To limit CO2 emissions and reduce your ecological footprint, you can adopt new habits such as these:

• Reduce your meat consumption and favour local, seasonal food;
• Recycle and give materials a second life;
• Optimise your energy consumption at home;
• Switch to a green energy supplier or produce your own energy with solar panels;
• Choose sustainable transport — walking, cycling or public transport.

Read more about environmental protection and the fight against global warming in our other guides!