Calculate the CO2 emissions from your food waste. See the greenhouse gas impact of wasted food sent to landfill and the savings from composting.
When food waste decomposes in landfills, it produces methane — a greenhouse gas approximately 80 times more potent than CO2 over a 20-year period. Food waste accounts for about 8–10% of global greenhouse gas emissions, making it a significant contributor to climate change. If food waste were a country, it would be the third-largest emitter on Earth.
The carbon footprint of wasted food includes not just the landfill emissions but also all the emissions from growing, transporting, processing, and refrigerating the food that ultimately gets thrown away. Every pound of food wasted represents wasted energy, water, and emissions from its entire lifecycle.
This calculator estimates the CO2-equivalent emissions from your food waste, helping you understand the climate impact of reducing food waste or diverting it from landfill through composting.
Tracking this metric consistently enables energy professionals and facility managers to identify consumption trends and implement efficiency improvements before costs escalate unnecessarily.
Food waste in landfills generates methane, a powerful greenhouse gas. This calculator quantifies the climate impact, showing how reducing food waste and composting can cut your carbon footprint. Data-driven tracking enables proactive energy management, helping organizations reduce operational costs while progressing toward environmental sustainability goals and carbon reduction targets. This quantitative approach replaces rough estimates with precise figures, enabling facility managers to identify the most cost-effective opportunities for reducing energy consumption.
CO2e = Lbs Wasted × 52 × Emission Factor (lbs CO2e per lb food waste) Landfill factor ≈ 3.8 lbs CO2e/lb food waste Composting factor ≈ 0.5 lbs CO2e/lb food waste
Result: 1,186 lbs CO2e/year
Annual food waste = 6 lbs/week × 52 = 312 lbs. Landfill emissions = 312 × 3.8 = 1,186 lbs CO2-equivalent per year. Composting would reduce this to 312 × 0.5 = 156 lbs CO2e, an 87% reduction.
Food waste accounts for 8–10% of global greenhouse gas emissions. This includes not just landfill methane but the entire lifecycle: agriculture (fertilizer, equipment, irrigation), processing, packaging, transportation, refrigeration, and retail. When food is wasted, all these emissions were for nothing.
Us landfills are the third-largest source of methane emissions in the country. Food waste is the primary driver, as it decomposes anaerobically to produce methane. Many landfills capture some methane for energy, but capture rates are typically only 60–75%, meaning 25–40% escapes to the atmosphere.
Composting diverts food waste from landfill, eliminates methane production, and creates a soil amendment that can sequester carbon. The net climate benefit of composting versus landfilling one ton of food waste is approximately 1.5 tons of CO2-equivalent avoided.
Landfills are anaerobic (oxygen-free) environments. When food decomposes without oxygen, it produces methane (CH4) instead of CO2. Methane traps 80× more heat than CO2 over 20 years, making landfill food waste a potent climate driver.
Composting is an aerobic process that produces CO2 rather than methane. It reduces emissions by 85–90% compared to landfill disposal. The remaining emissions come from transport and the composting process itself.
The EPA estimates approximately 3.8 lbs CO2-equivalent per pound of food waste sent to landfill (including lifecycle emissions). This factor accounts for methane generation, transport, and the embedded emissions from food production.
Yes. Wasted meat and dairy have higher lifecycle emissions because of the energy-intensive production process. Wasting one pound of beef represents about 33 lbs of CO2e, while wasting one pound of vegetables represents about 2 lbs of CO2e.
The average household's food waste generates about 1,200 lbs of CO2e per year, equivalent to driving approximately 1,300 miles. Reducing food waste by half is like taking your car off the road for a month.
Anaerobic digesters can convert food waste into biogas (methane) for energy production, while producing a nutrient-rich digestate for soil amendment. This approach captures the energy value while preventing atmospheric emissions.