OTHER · CARBON FOOTPRINT CALCULATOR — ESTIMATE YOUR ANNUAL CO₂ EMISSIONS
Carbon Footprint Calculator — Estimate Your Annual CO₂ Emissions
Estimate your annual personal carbon footprint in metric tons CO₂e. Enter your driving, home energy use, diet, and flights to see your total and how it compares to the US average.
Emission factors: US-EPA 2022–2023. Diet estimates: EPA/USDA. Represents direct + upstream emissions from consumption only.
About This Calculator
Your personal carbon footprint is the total greenhouse gas emissions caused by your activities in a year — expressed in metric tons of CO₂ equivalent (MT CO₂e). This calculator estimates it across four major categories: transportation, home energy, diet, and air travel. The US average is around 16 MT CO₂e per year; the global average is about 4 MT CO₂e per year.
How It Works
Enter your annual miles driven and fuel economy, your monthly home energy use (electricity and natural gas), your typical diet type, and how many flights you take each year. The calculator uses US-EPA emission factors to estimate each category's contribution and shows your total vs. the US average.
The Formula
totalMT = transportMT + electricityMT + naturalGasMT + dietMT + flightsMT
- transportMT
- (miles ÷ mpg) × 8.887 kg CO₂e/gal ÷ 1000
- electricityMT
- kWh/month × 12 × 0.386 kg CO₂e/kWh ÷ 1000
- dietMT
- annual MT by diet type (meat-heavy: 3.3, average: 2.5, vegetarian: 1.7, vegan: 1.5)
Frequently Asked Questions
- What does MT CO₂e mean?
- MT stands for metric ton (1,000 kg); CO₂e means "CO₂ equivalent" — a standard way to express the warming impact of all greenhouse gases (CO₂, methane, nitrous oxide, etc.) on a single scale.
- Why does this calculator not include all sources?
- This calculator covers the four largest sources of personal emissions for most Americans — transportation, home energy, diet, and air travel — which account for roughly 70–80% of a typical personal footprint. It excludes manufacturing/consumption of purchased goods, water use, and waste, which are harder to estimate without detailed tracking.
- Are the emission factors accurate?
- The factors are sourced from published US-EPA data (2022–2023 vintage). The electricity factor represents the US national average grid mix; your actual footprint from electricity may be lower if your utility uses more renewable energy, or higher in coal-heavy grids.
- What is the US average carbon footprint?
- The US EPA estimates the average American generates about 16 MT CO₂e per year across all sources. This calculator uses that as the comparison benchmark.
- How can I reduce my carbon footprint?
- The three highest-impact personal actions are typically driving less (or switching to an EV), reducing long-haul flights, and shifting toward a plant-based diet. Switching to renewable electricity (or rooftop solar) is also high-impact if your home uses natural gas or a carbon-heavy grid.