CO₂e · TTW + WTT

Transport CO₂ calculator

One shipment, several legs: enter gross mass and actual distances, choose suitable sources and export a reproducible calculation.

Shipment

Goods including packaging and load carriers. Do not use volume or chargeable weight. The same mass applies to every leg.

Actual gross mass (kg)

Transport legs

Supply the transport distance; no automatic routing or generic detour multiplier. Check the air-freight source note.

1Leg 1

Label / routeTransport modeEmission factor / sourceActual distance (km)

UK DESNZ 2026 ↗TTW 0.10356 + WTT 0.02359 kg CO₂e/tkm

UK reference: non-refrigerated diesel HGVs > 3.5 t, average laden. Use road route distance; do not adjust loading again.

Tab at the end of the last leg adds a leg. Enter in a terminal numeric field calculates.

UK DESNZ 2026

Defaults: UK DESNZ 2026, a UK reporting context. Factors are not universal global values. Use suitable own data when vehicle, region or energy basis differs.

Transport CO₂ calculator

Estimate transport emissions from actual gross mass, distance and traceable factors for each leg, with separate operational and upstream energy emissions.

All calculations are free to use without an account. Sign in only to save your work to your account.

How can I estimate CO₂e for a transport with several legs?

For an initial emissions overview of a shipment with a road feeder, rail or sea transport and final delivery. Document real gross mass and distances, check suitable factors and inspect each leg separately.

How to use this tool

One shipment, several legs: enter gross mass and actual distances, choose suitable sources and export a reproducible calculation.

Example workflow

Example: 1,000 kg over 100 km gives 100 tkm. With the selected road factor, multiply each TTW and WTT factor by 100.

Frequently asked questions

Which mass belongs in the calculation?

Goods including packaging and load carriers. Do not use volume or chargeable weight. The same mass applies to every leg.

Are the factors valid worldwide?

Defaults: UK DESNZ 2026, a UK reporting context. Factors are not universal global values. Use suitable own data when vehicle, region or energy basis differs.

What do TTW and WTT mean in the result?

tkm = gross mass (kg) ÷ 1000 × distance (km). Per leg: tkm × TTW + tkm × WTT. Sum all legs. An estimate, not ISO 14083 certification. TTW covers the factor’s operational greenhouse gases as CO₂e; WTT covers upstream energy. No added load, empty-mile or offset multipliers. Air freight excludes radiative forcing (RF).

Sources and scope

Defaults: UK DESNZ 2026, a UK reporting context. Factors are not universal global values. Use suitable own data when vehicle, region or energy basis differs.

An estimate, not ISO 14083 certification. TTW covers the factor’s operational greenhouse gases as CO₂e; WTT covers upstream energy. No added load, empty-mile or offset multipliers. Air freight excludes radiative forcing (RF). For this DESNZ air-freight factor: enter the great-circle distance between airports. The factor already includes an 8% distance uplift; do not add another uplift. RF and other aviation non-CO₂ climate effects are excluded.