Personal Carbon Footprint Calculator

💾 Saves

Your work autosaves to this browser as you type (under (autosave)). Save under a name to keep multiple scenarios. Export to JSON for backup or to move between browsers.

✈️ Flights

🚗 Ground transport

🚙 Car-share (Communauto, Zipcar, etc.)

Your share of the vehicle's existence = your usage % × 2 (assumes the car is actively used 50% of total time across all members). Operational fuel/electricity is added on top.

🚲 Commute

Drag the sliders to describe how you split your commute between modes. Sliders auto-normalise to 100%.

Sources: DEFRA 2024 per-passenger-km factors. Carpool assumes 2 occupants of an average petrol car. Public transit is the unweighted average of DEFRA local-bus and metro/light-rail factors.

⚡ Home energy

🥗 Diet

Drag the sliders to describe your mix. Sliders are normalised to 100% — so 50/50 vegetarian and pescatarian works the same as 1/1.

🛍 Consumption (USD per year)

High uncertainty. Per-dollar emission factors come from input-output models that average across an entire industry. Real per-dollar emissions vary widely with what you actually buy — a $50 steak dinner emits ~5–10× a $50 salad. Treat this section as a rough order-of-magnitude estimate (±50%); if a category dominates your total, dig deeper before drawing conclusions.

Country averages are a rough starting point — adjust to match your own spending.

CategoryUSD / yearFactor (NAICS)