Trips and Carbon Impacts
Last updated on 13 Nov, 2025
How does claimexpenses calculate carbon emissions?
claimexpenses calculates the carbon emissions for your travel items using figures published by the UK government (the "DEFRA factors"). These are published each year, usually around July or August, and contain figures for various types of transport as well as a wide range of other business activities.
How should I record Tram, Underground or Metro travel?
You can now select the appropriate trip type for Tram, Underground or Metro journeys.
How does claimexpenses calculate carbon emissions?