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Tri-Valley Transit

Carbon Savings Calculator


Calculate your CO2 savings from riding with TVT.










Commuting by public transportation reduces your carbon emissions by 20 lbs per day, 4,800 lbs per year, which is more than if you weatherized your home, converted to fluorescent bulbs and replaced an old refrigerator, combined.


Curious about the math and science behind this tool?

One gallon of gas weighs 6.3 pounds and produces 20 pounds of carbon dioxide. When burned, the carbon and hydrogen separate. The hydrogen combines with oxygen to form H2O and the carbon combines with oxygen to form CO2.

The carbon atom has a weight of 12 and each oxygen atom has a weight of 16, giving each single molecule of CO2 an atomic weight of 44 (12 from carbon and 32 from oxygen).

To calculate the amount of CO2 produced from a gallon of gasoline, the weight of the carbon in the gasoline is multiplied by 44/12 or 3.7.

Since gasoline is about 87% carbon and 13% hydrogen by weight, the carbon in a gallon of gasoline weighs 5.5 pounds (6.3 pounds x .87)

We can then multiply the weight of the carbon (5.5 pounds) by 3.7 which equals 20 pounds of CO2!