Ecological Footprint Calculator
Calculate how many Earths we would need if everyone lived like you.
Estimate your ecological footprint based on your daily habits.
Ecological footprint measures how much biologically productive land and water area is required to sustain a person’s or population’s lifestyle and absorb their waste. It is expressed in global hectares (gha) — a standardized unit representing one hectare of average global biological productivity.
Total footprint formula: Ecological Footprint (gha) = Carbon Footprint + Food Footprint + Housing Footprint + Transport Footprint + Goods and Services Footprint
Component formulas:
Carbon footprint component: Carbon Footprint (gha) = CO₂ emissions (tonnes/year) / Global Carbon Sequestration Rate (1.8 tCO₂/gha/year)
Food footprint benchmarks (gha/person/year):
- Vegan diet: ~0.6–1.0 gha
- Vegetarian diet: ~1.0–1.4 gha
- Average omnivore (U.S.): ~2.0–3.5 gha
- High meat diet: ~3.5–5.0 gha
Transport footprint:
- No car, transit/cycling: ~0.1–0.3 gha
- Average car (15,000 km/year, 8L/100km): ~0.9–1.2 gha
- Long-haul flights (2–4 per year): +0.5–1.5 gha
Global context: Earth’s biocapacity per person = 1.6 gha (2024 estimate for 8 billion people) Global average footprint per person = 2.75 gha Overshoot ratio = 2.75 / 1.6 = 1.72 → humanity currently uses 72% more than Earth regenerates annually.
Earth Overshoot Day 2024: August 1 — the date when humanity exhausted Earth’s annual regenerative budget.
Worked example: Average U.S. resident ecological footprint breakdown:
- Carbon (electricity + heating + flights): ~3.5 gha
- Food (omnivore diet): ~2.5 gha
- Housing (suburban, 150 m²): ~1.2 gha
- Transport (SUV + 2 flights/year): ~1.8 gha
- Goods and services: ~0.8 gha Total ≈ 9.8 gha — requiring 6.1 Earths if everyone lived this way.