Carbon Footprint Calculator

Enter your annual activity

Use annual totals where possible. If you only know monthly numbers, multiply by 12 (or estimate a typical month × 12).

Electricity: kWh per year.
Natural gas: therms per year (or leave blank).
Driving: miles per year and average MPG.
Flights: total flight-hours per year (very rough).

What’s included?

This quick estimator focuses on common household categories.

Home electricity

Natural gas

Driving

Air travel

Want this to match your exact region? Replace the factors below with your utility/provider factors, or we can add a state dropdown and auto-load common values.

Inputs

Leave a field blank if it doesn’t apply.

Electricity (kWh / year)

Tip: check your utility annual summary.

Natural gas (therms / year)

If you use propane, we can add that too.

Driving (miles / year)

Vehicle efficiency (MPG)

If blank, we’ll assume 25 MPG.

Flights (hours / year)

Rough estimate (short vs long haul varies a lot).

Diet (optional)

Adds an approximate tons CO₂e/year.

Emission factors (editable)

These are “quick-estimate” defaults. Replace with your local factors if you have them. Units are shown in the table.

Category	Factor	Unit
Electricity		metric tons / kWh
Natural gas		metric tons / therm
Gasoline		metric tons / gallon
Flights		metric tons / flight-hour
Tree uptake		kg CO₂ / tree-year

Electricity factor is a placeholder close to a U.S.-average order-of-magnitude. If you’re in Arizona (APS/SRP), using utility-specific lbs CO₂/kWh will improve accuracy.

Results breakdown

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Electricity (t CO₂e)

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Natural gas (t CO₂e)

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Driving (t CO₂e)

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Flights (t CO₂e)

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Diet add-on (t CO₂e)

Need this calculator to align with your project pages (donations, “trees planted”, “lbs sequestered”, etc.)? Tell me the exact outputs you want and I’ll wire them in.

Enter your annual activity

What’s included?

Inputs

Emission factors (editable)

Results breakdown

Next upgrades (optional)