Food Waste Calculator

Studies show that the average household wastes around 30-40% of food purchased. In the US, this translates to roughly $1,500–$3,000 per year per household depending on family size and diet. Most waste comes from fresh produce, prepared meals, and dairy products.

When food decomposes in landfills, it releases methane — a greenhouse gas around 25 times more potent than CO₂. Globally, food waste accounts for approximately 8-10% of total greenhouse gas emissions. The water, land, and energy used to produce wasted food also represent a significant environmental cost.

The CO₂ estimate uses established emission factors per kilogram of food wasted for each category. Meat and dairy carry the highest CO₂ footprint per kg due to the resources needed to produce them, while produce and grains have lower but still significant impacts.

Fresh fruits and vegetables are the most commonly wasted food category, often due to spoilage before they can be used. Prepared meals and leftovers are the second biggest contributor, followed by bread and grain products.

Key strategies include meal planning before shopping, storing food correctly to extend shelf life, using a first-in-first-out rotation in your fridge, portioning meals accurately, and repurposing leftovers. Even a 10% reduction in waste can save a family of four hundreds of dollars a year.

The meals wasted figure estimates how many full servings of food are discarded per year based on your waste cost and an average cost-per-meal estimate. It helps put the dollar figures into a more tangible, human-scale perspective.

Yes — the waste percentages, CO₂ emission factors, and cost estimates are based on published research from organizations like the USDA, ReFED, and the UN Food and Agriculture Organization. Default values reflect real-world averages, but you can adjust all inputs to match your actual household habits.

Diet type influences how your grocery spending is distributed across categories. A high-meat diet concentrates more spend — and potential waste — in the highest-CO₂ category. Vegan and vegetarian diets generally result in lower CO₂ emissions per dollar of food wasted, even at the same waste percentage.