# Food Miles Calculator Estimate the transport emissions behind a food item based on weight, distance, and shipping mode. --- - **Canonical URL:** https://dothecalculation.com/calculators/food-miles-calculator - **Category:** Eco & Sustainability - **Publisher:** Do The Calculation (https://dothecalculation.com) - **Cost:** Free, no account or sign-up required - **Privacy:** Runs entirely in the browser; inputs are never sent to a server - **Methodology:** https://dothecalculation.com/methodology --- ## Food Miles Calculator Estimate the transport emissions behind a food item based on its weight, distance traveled, and shipping mode — and see why the mode matters far more than the distance alone. - Emissions per tonne-km for sea, rail, truck, and air freight - Air freight emissions can exceed sea freight by 50x or more - Transport is only one slice of a food's total footprint ## Quick Answer — Shipping Mode Matters More Than Distance "Food miles" is a popular but often misleading shorthand — what actually determines transport emissions is the **shipping mode**, not just the distance traveled. This calculator uses representative emissions factors in grams of CO2 per tonne-kilometer: **ocean freight** is by far the most efficient at roughly **20 g/tonne-km**, **rail freight** around **35 g/tonne-km**, **truck freight** around **110 g/tonne-km**, and **air freight** around **1,130 g/tonne-km** — more than 50 times higher than sea shipping per unit of weight and distance. This means a food item shipped a very long distance by sea can have a smaller transport footprint than the same item trucked a much shorter distance, and air-freighted produce (common for items that spoil quickly, like berries or fresh fish) carries an outsized emissions cost regardless of the actual mileage. ## How to Use This Calculator Enter the food item's weight in pounds, the distance it traveled in miles, and its primary shipping mode. The calculator converts to tonnes and kilometers, then applies the mode-specific emissions factor. **Worked example — air-freighted item:** 10 lbs of a perishable item flown 5,500 miles (a typical long-haul air freight route). Weight = 10 / 2,204.62 = 0.00454 tonnes. Distance = 5,500 × 1.60934 = 8,851 km. Emissions = 0.00454 × 8,851 × 1,130 (air factor) = **45,369 grams**, or about **100 lbs of CO2** — ten times the item's own weight in emissions, illustrating why air freight is the highest-impact shipping mode by a wide margin. ## A Second Example: Truck-Shipped Produce 20 lbs of produce trucked 1,600 miles (roughly a cross-country US trucking route). Weight = 20 / 2,204.62 = 0.00907 tonnes. Distance = 1,600 × 1.60934 = 2,575 km. Emissions = 0.00907 × 2,575 × 110 (truck factor) = **2,570 grams**, or about **5.7 lbs of CO2** — dramatically lower than the air-freight example despite similar weight, because truck freight's per-tonne-km factor is roughly one-tenth of air freight's, even though the truck traveled a comparable or longer relative distance for this comparison. ## Why Ocean Freight Is So Efficient Cargo ships move enormous volumes of freight per trip relative to their fuel burn, which is why ocean freight's per-tonne-km emissions factor is so low despite typically covering the longest distances of any shipping mode (many imported foods cross an ocean). This is the core reason "local" isn't automatically lower-emissions than "imported" — a tomato trucked 200 miles from a heated greenhouse can have a larger footprint than one shipped 6,000 miles by sea from a naturally warm growing region, once you account for both transport and production emissions. Air freight is reserved mainly for highly perishable items that can't survive a multi-week sea voyage — fresh berries, cut flowers, some fish and seafood — which is why those specific items tend to carry disproportionately high transport footprints relative to their weight. ## What This Calculator Doesn't Cover Transport is typically a smaller slice of a food's total lifecycle footprint than production — farming method, fertilizer use, land use change, and (for animal products) methane emissions usually dominate a food's overall footprint far more than how far it traveled. A food-miles number alone shouldn't be read as "this food's total climate impact"; it's specifically the shipping leg. This calculator also doesn't include "last mile" distribution from a regional warehouse to a store or your home, refrigeration energy during transport, or packaging emissions — all of which add to a food's real total footprint beyond the long-haul transport leg estimated here. ## Related Calculators For the production side of a food's footprint, which usually matters more than transport, see the [meat vs. plant-based diet carbon calculator](/calculators/meat-vs-plant-based-diet-carbon-calculator). For a broader personal footprint picture, use the [carbon footprint calculator](/calculators/carbon-footprint-calculator), or see the [food waste impact calculator](/calculators/food-waste-impact-calculator) to estimate the impact of food that's shipped but never eaten. For the passenger-transport equivalent of this same mode-matters-more-than-distance idea, the [public transit vs. driving calculator](/calculators/public-transit-vs-driving-calculator) compares commuting emissions by mode. ## Frequently asked questions ### Is local food always lower-emissions than imported food? Not necessarily. Shipping mode matters more than distance — a food shipped a long way by sea can have lower transport emissions than one trucked a shorter distance, and local food grown in an energy-intensive heated greenhouse can have a larger total footprint than sea-shipped food grown in a naturally suitable climate. ### Why is air freight so much worse than other modes? Aircraft burn far more fuel per tonne of cargo moved than ships, trains, or trucks. Air freight's roughly 1,130 g/tonne-km factor is over 50 times higher than ocean freight's roughly 20 g/tonne-km, which is why it's reserved mainly for highly perishable goods that justify the cost and emissions premium. ### How do I know what shipping mode my food traveled by? This isn't usually printed on packaging. As a rule of thumb: highly perishable items available out of season (berries, some fish) are more likely air-freighted; shelf-stable or less perishable imported goods (grains, canned goods, most produce) typically travel by sea or truck. ### Does transport emissions matter as much as how the food was grown? Usually not — production (farming method, fertilizer, land use, and for meat and dairy, methane) is typically the larger share of a food's total footprint. Transport is one contributing factor, not the whole picture. ### What's a tonne-kilometer? It's a standard freight metric: moving one tonne (1,000 kg) of cargo one kilometer. Emissions factors are expressed per tonne-km so they can be applied to any combination of weight and distance. ### Why does rail have a higher factor than ocean freight? Ocean freight vessels carry enormously more cargo per trip than trains, spreading fuel use across a much larger tonnage — rail is still efficient compared to trucking, but doesn't match the sheer economies of scale of a container ship. ## Related concepts - **Tonne-kilometer** — A standard freight transport unit measuring the movement of one tonne of cargo over one kilometer, used to compare emissions efficiency across shipping modes. - **Last-mile distribution** — The final, shorter leg of a food's journey from a regional warehouse or distribution center to a retail store, not included in this calculator's long-haul transport estimate. - **Food lifecycle footprint** — The full emissions profile of a food item across production, processing, transport, retail, and disposal — of which transport is typically one of the smaller components. ## Related guides - [How to Use Do The Calculation Calculators: A Practical Step-by-Step Guide](https://dothecalculation.com/blog/site-guides/how-to-use-calculators) — Learn the fastest reliable workflow for using Do The Calculation calculators, reading results, checking formulas, and using save, print, share, and export actions correctly. - [Understanding Calculator Formulas: How DTC Turns Inputs into Results](https://dothecalculation.com/blog/site-guides/understanding-calculator-formulas) — Understand how Do The Calculation formulas are presented, what the explanation blocks mean, and how to verify calculator logic before using a result in a real decision. ## Related calculators - [Flight Carbon Footprint Calculator](https://dothecalculation.com/calculators/flight-carbon-footprint-calculator) — Estimate the CO2e emissions of a flight from distance, cabin class, round trip, and passenger count using DEFRA 2026 factors. - [Carbon Footprint Calculator](https://dothecalculation.com/calculators/carbon-footprint-calculator) — Estimate your annual carbon emissions from energy use, transportation, and waste to see your environmental impact and find ways to reduce it. - [Fuel Cost Calculator](https://dothecalculation.com/calculators/fuel-cost-calculator) — Estimate gasoline expenses from trip distance, annual mileage, fuel economy, and local fuel prices to budget your driving costs accurately. - [Tree Planting Carbon Offset & Lifetime Sequestration Calculator](https://dothecalculation.com/calculators/carbon-offset-trees-calculator) — Estimate the annual and cumulative carbon sequestration of trees based on species, age, climate, and soil conditions for offset planning. - [Compost Carbon Offset & Nutrient Value Calculator](https://dothecalculation.com/calculators/compost-impact-calculator) — Calculate finished compost yields, methane emissions prevented, and the equivalent N-P-K fertilizer nutrient replacement value. - [E-Bike vs Car Savings Calculator](https://dothecalculation.com/calculators/ebike-vs-car-savings-calculator) — Calculate your annual cost savings and CO2 avoided by replacing car miles with e-bike riding. --- _This calculator provides educational, formula-based estimates using representative freight-mode emissions factors. Actual transport emissions vary by specific route, vessel or vehicle efficiency, and cargo consolidation._ --- _Source: [Do The Calculation](https://dothecalculation.com/calculators/food-miles-calculator). Quote freely with attribution and a link to this page._