Free online tool · ESG
Shipping Carbon Calculator — compare the emissions of three modes, free
Pick a route, enter your cargo weight, and instantly compare the carbon emissions of sea, road and air freight — so cutting carbon becomes part of how you choose a mode, not just saving on freight
Sea vs Air
Move the same shipment by air, and its emissions are often dozens of times those of sea freight
We're not saying never fly — urgent goods should go by air. But when you're reporting ESG numbers or answering a brand customer's carbon-disclosure request, that gap goes straight into your supply chain's carbon footprint. Run your own cargo below and see your numbers.
Why look at transport emissions?
- Brand buyers' Scope 3 requirements: major international retailers ask suppliers for their transport carbon footprint
- ESG / sustainability reporting: this number is used in listed-company disclosure and green-grant applications alike
- Choosing the right mode: ship by sea instead of air where you can, and you save more than freight — you save carbon too
Note: the EU's CBAM carbon border tax applies to the carbon of product manufacturing (items like steel, aluminum and cement), not transport emissions; this tool only estimates transport emissions, so keep the two separate. For a full carbon inventory and CBAM assessment, talk to Jumping Freight
Enter your cargo weight to see the gap between the three modes
Need to put this emissions figure into an ESG / Scope 3 report, or want a formal carbon inventory? Ask Jumping Freight on LINE ›
Methodology: GLEC Framework (v3.2) + ISO 14083:2023 | Emission factors: GLEC defaults, aligned with DEFRA/DESNZ (grams CO₂e per tonne-kilometer, well-to-wheel). Sea uses real shipping-route distance; air uses great-circle straight-line distance. This tool is for estimation; actual emissions vary by vessel, route, load factor and fuel, and it is not a verified carbon footprint or carbon-offset claim
How are transport emissions calculated?
Freight CO₂ has one clean, citable formula: CO₂e (kg) = cargo weight (tonnes) × distance (km) × emission factor. The emission factor varies by mode, estimated from GLEC Framework defaults (aligned with ISO 14083:2023 and DEFRA/DESNZ conversion factors): sea freight (container ship) is roughly 16 grams per tonne-kilometer, road trucking around 80 grams, and air freight around 600 grams. In other words, move the same shipment by air and its emissions are often dozens of times those of sea freight. This tool uses real shipping-route distance for sea and the great-circle straight-line distance between port coordinates for air, calculated separately.
That's exactly why "ship by sea instead of air where you can" isn't just about saving freight — it's about cutting carbon. For Taiwanese manufacturers exporting to Europe and the US and facing brand buyers' Scope 3 carbon-disclosure requirements, the choice of transport mode goes straight into the supply chain's carbon-footprint figure. This calculator turns abstract carbon into "the equivalent of how many trees absorb in a year, or how many kilometers of driving," so you have a baseline before you pick a mode or report your ESG numbers.
What this tool can do: use public emission factors to quickly estimate the carbon range for the same shipment across different modes, helping you compare, communicate and make a preliminary disclosure. What it can't do: it isn't a verified, formal carbon inventory, and it doesn't include warehousing, last-mile delivery or packaging emissions; to put numbers into a formal sustainability report or apply for a green grant, you still need a full carbon inventory — and that's the part Jumping Freight helps you carry on with.
ESG & market entry
Why has carbon suddenly become a market-entry issue?
2026 is a watershed: the EU's carbon border tax enters its charging phase, Taiwan's carbon fee formally takes effect, and brand customers are pushing carbon disclosure down into the supply chain. For Taiwanese manufacturers shipping to Europe and the US, carbon data is shifting from "a bonus" to "a ticket in" — and even the mode you ship by is starting to be written into the supply chain's carbon footprint.
The carbon border tax enters its charging phase
It covers items such as steel, aluminum, cement, fertilizer, electricity and hydrogen, and applies to the embedded carbon of "product manufacturing"; certificates go on sale from Feb 2027, with the first filing and payment due by Sep 2027, and imports of 50 tonnes a year or less are exempt. Taiwan's Ministry of Economic Affairs estimates a first-wave impact of around NT$24.5 billion, mostly on steel.
Who should watch this: steel/aluminum and manufacturers exporting to the EUThe domestic carbon fee formally takes effect
The general rate is NT$300 per tonne, with a first wave of about 500 plants (281 companies, including 141 listed firms); the threshold is large direct-plus-indirect emitters of 25,000 tonnes a year or more, starting with industries like steel, cement and semiconductors.
Who should watch this: domestic emitters above 25,000 tonnes a yearSupply-chain carbon-disclosure pressure flows downstream
The FSC's sustainable-development roadmap plus the Ministry of Economic Affairs' "big leads small" program, together with brand customers like Apple requiring suppliers to disclose carbon data, pass the pressure from large plants all the way down to small and mid-sized contract manufacturers and suppliers — even if you're not on the first two waves' lists, customers will come asking for the numbers.
Who should watch this: contract manufacturers supplying large plants / brand customersOne honest line on the boundary: this tool calculates "transport" emissions, which are a different thing from the "product manufacturing" carbon that CBAM taxes — transport carbon is not within CBAM's scope. But whether it's Scope 3 disclosure, a brand customer asking for data, or a green-grant application, carbon data is the ticket into Europe — start by understanding your transport emissions, and for a formal carbon inventory and eligibility check, message Jumping Freight on LINE and we'll carry it on with you ›
Fact-checked 2026-06, subject to each authority's official announcements for the year: European Commission CBAM · Climate Change Administration, Ministry of Environment — carbon fee · FSC sustainable-development roadmap
After you calculate
This figure has a clear place in your sustainability report
Many small and mid-sized firms get stuck on the same thing: they know they have to report Scope 3, but not how to calculate the carbon for the inbound-freight leg, where the numbers come from, or what evidence to attach for verification. That's the gap this tool fills — once you've run it, don't just let the number sit there looking nice; it has a home that lines up with international standards.
Under the GHG Protocol, the transport emissions for goods you import from overseas fall under Scope 3, Category 4 "Upstream transportation & distribution." If you're shipping out to customers, it falls under Category 9, downstream instead.
Fill the distance, cargo weight and emissions from this tool into this template:
"For our company's 2026 sea-freight goods imported from ○○, with a total transport distance of approximately ___ km and a cargo weight of ___ tonnes, upstream transport emissions (Scope 3 Cat 4), estimated using GLEC Framework emission factors, were approximately ___ tonnes CO₂e."
When a sustainability report is third-party verified, you'll be asked to account for "where the carbon number came from." This tool's methodology (GLEC Framework v3.2 + ISO 14083:2023) and factor sources are exactly the calculation basis to attach here — not a number filled in by guesswork.
How far Jumping Freight goes: we get the "transport leg" right and can produce the methodology to back it up; the full carbon inventory and sustainability-report writing are best left to your accountant or sustainability consultant. Need the full transport data and calculation basis for this leg? Message us on LINE and we'll put it together for you ›
Transport emissions — get these straight first
Want a formal carbon inventory? Ask Jumping Freight on LINE ›
The basic formula is CO₂e = cargo weight (tonnes) × distance (km) × emission factor. The emission factor varies by mode: sea freight (container ship) is roughly 16 grams per tonne-kilometer, road trucking around 80 grams, and air freight around 600 grams (GLEC Framework defaults, aligned with ISO 14083:2023 and DEFRA/DESNZ). Calculate all three side by side and you can see the emissions gap for the same shipment across different modes.
Because the energy use per unit of cargo differs enormously. A container ship carries tens of thousands of tonnes at once, so its energy use per tonne-kilometer is extremely low; an aircraft carries little and burns a lot of fuel, so its emission factor per tonne-kilometer is dozens of times that of sea freight. So moving the same shipment by air often produces 30–40 times the emissions of sea freight for the whole trip.
It works as a reference for internal assessment and preliminary communication, but we don't recommend using it directly as a formal disclosure value. Formal Scope 3 transport emissions require verified activity data and factors, and need to cover stages like warehousing and last-mile delivery. To put numbers into a sustainability report or apply for a green grant, run a full carbon inventory — message us on LINE and Jumping Freight will carry it on with you.
The two should be kept separate. The EU's CBAM carbon border tax applies to the carbon of the "product manufacturing" process, and for now is limited to items like steel, aluminum, cement, fertilizer, electricity and hydrogen — not transport emissions. This tool only estimates transport emissions; CBAM applicability and product carbon inventory are a separate matter that needs a dedicated assessment.
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