Calculadora de Sacolas Plásticas
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
CO₂e = sacolas × 0,033 kg; break-even algodão = 7100 usos
About this calculator
This calculator estimates the carbon footprint (CO₂e) from using disposable plastic bags. The calculation is simple: multiply the number of bags entered by 0.033 kg of CO₂e per bag, an average value based on life cycle studies. The result shows the environmental impact in kilograms of carbon dioxide equivalent.
In addition to the footprint calculation, the tool compares this impact with that of a reusable cotton bag. For a cotton bag to be environmentally advantageous, it must be used many times, the so-called break-even point. Our calculator uses 7,100 uses as a reference, a number that considers production, transportation, and disposal of the cotton bag.
Use this calculator when you want to understand the real impact of your choices at the supermarket or market. For example, at the end of a month of shopping, you can add up how many plastic bags you used and see the corresponding CO₂e. It is also useful for comparing habits between disposable plastic and reusable alternatives, helping in the decision to adopt cotton or other material bags.
Caveats: the value of 0.033 kg per bag is an average; it may vary depending on the type of plastic, manufacturing process, and final destination (recycling or landfill). The break-even of 7,100 uses for cotton is also an estimate; it depends on the bag's weight, cotton type, and logistics. Use the results as an educational reference, not as precise certification.
Frequently asked questions
How was the value of 0.033 kg per bag determined?
This value is an average from life cycle studies of common plastic bags, considering oil extraction, manufacturing, transport, and disposal. It may vary depending on the plastic type and final destination.
Why 7,100 uses for the cotton bag?
This number is an estimate based on analyses that consider cotton production, weaving, sewing, transport, and disposal. Fewer uses make the cotton bag more impactful than disposable plastic.
Can I use the calculator for other reusable bag types?
Yes, but the break-even will differ. Polypropylene (non-woven) or nylon bags have different footprints and lifespans. The calculator serves as a reference for cotton; for other materials, seek specific data.
What does CO₂e mean?
CO₂e (carbon dioxide equivalent) is a measure that unifies different greenhouse gases into a common unit, based on the global warming potential of CO₂. It includes methane, nitrous oxide, etc., converted to CO₂ equivalent.
Does the calculator consider bag recycling?
Not directly. The value of 0.033 kg per bag assumes an average disposal scenario (landfill, incineration, or recycling). If you recycle, the impact may be lower, but the tool uses a conservative average.