Carbon Footprint Calculator
Rough estimate only, using commonly-cited US-average emission factors: gasoline at 8.887 kg CO₂/gallon (EPA), grid electricity at ~0.4 kg CO₂/kWh (US average — varies a lot by country and even by utility), and typical per-passenger flight averages (~250kg short-haul, ~1,500kg long-haul). Real carbon footprint calculators disagree with each other for exactly this reason — different assumed emission factors. This tool asks for only 3 things on purpose, instead of an exhaustive form, and shows you which numbers it assumed so you can judge for yourself.
A quick, honest estimate of your annual carbon footprint from driving, electricity, and flights — using published emission factors, not a black box.
How it works
- Enter weekly driving distance and your vehicle's fuel economy
- Enter monthly electricity use in kWh
- Enter roughly how many short and long flights you take per year — get an annual CO2 estimate broken down by category
Frequently asked questions
Why do different carbon footprint calculators give different numbers?
Because they assume different emission factors — especially for electricity, which varies enormously by country and even by local utility depending on the energy mix. This calculator shows you exactly which factors it used so you can judge for yourself.
How accurate is this?
It's a rough estimate, not a personalized carbon audit. Reviews of carbon calculators consistently point out that simple tools can't capture every nuance of an individual's lifestyle — this one deliberately asks for only 3 things instead of an exhaustive form, in exchange for being fast and transparent about its assumptions.
Where do the emission factors come from?
Gasoline: 8.887 kg CO2 per US gallon (EPA). Electricity: approximately 0.4 kg CO2 per kWh (US grid average — this varies a lot by country). Flights: commonly-cited per-passenger averages for short-haul (~250kg) and long-haul (~1,500kg) trips.
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From the blog
Update history
- 2026-09-02 Launched: carbon footprint calculator covering driving, electricity, and flights, using published EPA-based emission factors shown transparently in the results. Entirely client-side.