Enter your shipment weight, transport mode (air, sea, road, or rail), and shipping distance to get an estimated CO₂ emissions figure for your package. Results include total carbon footprint in kg CO₂e, emissions intensity per tonne-km, and a breakdown chart — so you can compare modes and make greener shipping choices.
Total CO₂ Emissions
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Emissions Intensity
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Tonne-Kilometres (tkm)
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CO₂ per Package
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Trees Needed to Offset (1 year)
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Shipping CO₂ emissions are calculated using the formula: CO₂ (kg) = (Weight in tonnes × Distance in km × Emission Factor) ÷ Load Factor. Emission factors vary by transport mode — air freight has the highest factor, while sea and rail are significantly lower. This approach aligns with the GLEC Framework and ISO 14083:2023 standards used by industry professionals.
Rail freight is typically the lowest-emission land transport mode, followed closely by sea freight for long distances. Road (truck) freight falls in the middle, while air freight produces roughly 20–50 times more CO₂ per tonne-km than sea shipping. Choosing sea or rail over air can dramatically cut your shipment's carbon footprint.
CO₂e stands for 'carbon dioxide equivalent.' It's a standard unit that expresses the global warming potential of all greenhouse gases (including methane and nitrous oxide) in terms of the equivalent amount of CO₂. Using CO₂e gives a complete picture of a shipment's climate impact, not just the direct CO₂ emissions.
The Global Logistics Emissions Council (GLEC) Framework is the globally recognised methodology for calculating and reporting greenhouse gas emissions across the logistics supply chain. It was adopted as the basis for ISO 14083:2023, the international standard for quantifying GHG emissions from freight transport. Using GLEC-aligned calculations ensures your results are comparable and credible for sustainability reporting.
Emissions intensity measures how much CO₂e is produced per tonne of cargo moved per kilometre. It's a normalised metric that lets you compare the efficiency of different modes and routes regardless of shipment size. Lower values indicate more fuel-efficient, lower-emission transport.
Load factor refers to how full a vehicle or vessel is when carrying your cargo. When a truck or ship is fully loaded, the emissions are shared across more cargo, lowering the per-kg CO₂ footprint. A half-empty truck effectively doubles the emissions attributed to your shipment compared to a full one.
This calculator provides a reliable estimate based on standardised emission factors and is useful for internal sustainability tracking, supplier comparisons, and identifying reduction opportunities. For formal ESG or regulatory reporting (e.g. GHG Protocol Scope 3), you may need verified carrier-specific data or certified tools aligned with ISO 14083:2023.
A mature tree absorbs approximately 21 kg of CO₂ per year on average. The 'trees to offset' figure divides your total CO₂e by 21 to give a relatable sense of the offset effort required. This is for illustrative purposes — real carbon offsetting involves verified forestry or renewable energy projects through certified programs.