Carbon Footprint Calculator

Estimate your annual CO₂e emissions from electricity, driving, flying, and diet, using standard published emission factors. See how you compare to global and US averages. Runs locally in your browser.

Your inputs (per year, or weekly where noted)

Electricity use

kWh per month · US grid avg 0.385 kg/kWh

Driving distance

miles per week (leave 0 if none)

Fuel economy

miles per gallon (mpg)

Fuel type

tailpipe + upstream per gallon

Flying

km flown per year · 0.15 kg/km

Diet

annual food emissions

Enter any values above to estimate your annual carbon footprint.

Factors: electricity 0.385 kg CO₂e/kWh (US eGRID average); gasoline 8.89 kg/gal, diesel 10.16 kg/gal (well-to-wheel); aviation 0.15 kg/km per passenger (with radiative-forcing allowance); diet annual averages from published life-cycle studies. One mature tree absorbs roughly 21 kg CO₂/yr, so the "trees to offset" number is total ÷ 21. These are coarse estimates — real footprints vary with local grid mix, vehicle, and habits. Runs locally — nothing leaves your browser.