Carbon Footprint Offset Calculator

Estimate your annual CO₂ footprint from electricity, driving, flights, and diet, with tree and cost offsets.

Inputs

Annual Electricity (kWh)

Annual Miles Driven

Round-Trip Flights / Year

Diet Type

Tab to move between fields

Results

Total Annual CO₂ (tons)

12.75

Electricity CO₂ (tons)4.38

Driving CO₂ (tons)4.85

Flights CO₂ (tons)1.02

Diet CO₂ (tons)2.5

Trees Needed to Offset580

Offset Cost Estimate ($)$318.66

How to Use This Calculator

Enter Annual Electricity (kWh), Annual Miles Driven, and Round-Trip Flights / Year.
Set Diet Type.
Review the Total Annual CO₂ (tons) result.
Use Electricity CO₂ (tons) and Driving CO₂ (tons) to inform your decision.

How the result changes with Annual Miles Driven

Annual Miles Driven	Total Annual CO₂ (tons)
20,000	15.98
70,000	36.18
130,000	60.42
180,000	80.62

What each input means

Annual Electricity (kWh): Annual household electricity consumption. US average is ~10,500 kWh.
Annual Miles Driven: Total miles driven per year. US average is ~12,000 miles.
Round-Trip Flights / Year: Number of round-trip flights per year (average ~2,000 miles each).
Diet Type: 1 = Vegan, 2 = Vegetarian, 3 = Average, 4 = Heavy meat.

What each result means

Total Annual CO₂ (tons): Total estimated annual carbon footprint in metric tons.
Electricity CO₂ (tons): CO₂ from electricity consumption using EPA eGRID average.
Driving CO₂ (tons): CO₂ from driving based on EPA average passenger vehicle.
Flights CO₂ (tons): CO₂ from air travel.
Diet CO₂ (tons): Annual CO₂ attributed to food production for your diet type.
Trees Needed to Offset: Number of mature trees needed to absorb your annual CO₂ (~22 kg CO₂/tree/year).
Offset Cost Estimate ($): Estimated cost to purchase carbon offsets at ~$25/ton.

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Annual Electricity (kWh) = 10500, Annual Miles Driven = 12000, Round-Trip Flights / Year = 2, Diet Type = 3 = 4 input(s) provided
Calculate Total Annual CO₂
Total Annual CO₂ = electricityCo2Tons + drivingCo2Tons + flightsCo2Tons + dietCo2Tons
12.75 = 12.75
Calculate Electricity CO₂
Electricity CO₂ = (annualKwh * CO2_PER_KWH_KG) / 1000
4.38 = 4.38
Calculate Driving CO₂
Driving CO₂ = (annualMilesDriven * CO2_PER_MILE_KG) / 1000
4.85 = 4.85

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