Travel emissions

Enter the one-way route distance, group size and return option. For cars and motorbikes, enter the number of shared vehicles; the vehicle total is divided across the group. Rail, coach, ferry and flight factors are already per person and are never divided by the group size. A ferry car passenger is also a per-person factor.

Presets use DESNZ 2026, full set v1, UK averages. Flights use economy except the explicit business option; domestic/short/long UK categories follow the source’s geography, not automatic distance thresholds. Outside-UK flights use its international economy category. Rail is UK national rail or Eurostar. These are estimates, not measurements of your vehicle or route. For another country/provider, use a documented own factor and its vehicle/person basis.

Energy supply includes well-to-tank emissions. Electric-car operation includes electricity generation and grid losses. Manufacturing vehicles and infrastructure is excluded. Flight factors include the source’s distance adjustment already; enter great-circle distance and do not add another 8%. The flight-effects option uses the published radiative-forcing factors, with substantial uncertainty, without multiplying fuel supply emissions.

Both options use the same group, return setting and scope switches. Enter a separate one-way distance or vehicle count for the alternative when needed. Blank fields use the selected option’s values. Difference is comparison minus selected: positive means the comparison emits more. Your own factor is used as entered, unaffected by scope switches; check comparability. Zero distance/factor is allowed; people and vehicles must be positive whole numbers. Your inputs, scope switches and open sections are saved locally in this browser, including unfinished entries. Results update as you edit or reload. The comparison always uses a different transport preset; the displayed difference is for the whole group.