The 2026 UK Government GHG Conversion Factors are live — and already updated in CalCommuter

The 2026 UK Government Greenhouse Gas Conversion Factors for Company Reporting have now been published by the Department for Energy Security and Net Zero.

These factors are an important part of how UK organisations calculate and report greenhouse gas emissions. They are used to convert activity data — such as miles travelled, fuel used, electricity consumed or hours worked from home — into emissions estimates.

At CalCommuter, we use the relevant official UK Government conversion factors within the platform to calculate commuting and homeworking emissions. They support the calculations behind employee commute plans and employer dashboards, helping organisations understand current commuting emissions and compare them with realistic alternatives.

Following the latest release, the 2026 factors have already been incorporated into the CalCommuter platform.

Why the 2026 update matters

Not every change in the Government methodology affects CalCommuter. The published conversion factors cover a wide range of activities, including fuels, electricity, transport, waste, water, materials, aviation, hotel stays and more.

CalCommuter focuses on the factors relevant to workplace travel, commuting and homeworking.

The most important change this year is the update to the electricity conversion factor methodology.

In simple terms, the 2026 methodology allows more up-to-date information on UK grid electricity generation to be reflected in the conversion factors. Because the UK electricity grid has continued to decarbonise, this results in a significant reduction in the electricity conversion factor compared with 2025.

That matters because electricity-related emissions appear in several areas relevant to commuting and workplace travel, including:

• electric vehicles

• rail

• light rail and other electricity-related public transport

• homeworking office equipment emissions

For organisations using CalCommuter, this means new surveys and analysis will use the latest official assumptions for 2026 reporting.

What has changed for CalCommuter users?

For most users, the experience of using CalCommuter will not change.

Employees will still receive tailored commute plans showing the cost, duration and emissions of their current commute alongside viable alternatives.

Employers will still receive dashboard insight into:

• commuting emissions

• homeworking emissions

• mode share

• travel patterns

• viable alternatives

• opportunities for intervention

The important change is behind the scenes: the emissions calculations now reflect the latest official UK Government conversion factors for 2026.

This ensures that organisations using CalCommuter for 2026 surveys are working with current reporting assumptions rather than historic factors.

Why year-on-year comparison needs context

Annual updates to conversion factors are necessary. They help reporting stay aligned with the latest evidence.

However, they also mean that year-on-year comparisons need to be interpreted carefully.

A change in reported commuting or homeworking emissions may be caused by several things, including:

• changes in how employees travel

• changes in working patterns

• changes in vehicle types

• changes in public transport use

• changes in the electricity grid

• updates to official emissions factors

• changes in Government methodology

This distinction is important. A reduction in reported emissions may reflect genuine behaviour change, but it may also reflect an update to the underlying conversion factors.

That is why CalCommuter is designed to provide more than a single emissions figure.

The platform helps organisations understand how staff commute today, how they could travel tomorrow, and where the most realistic opportunities for change exist.

Commuting emissions are only part of the story

Employee commuting is an important part of many organisations’ Scope 3 emissions, but workplace travel planning should not be treated as a reporting exercise alone.

Commuting also affects:

• parking demand

• congestion around worksites

• staff travel costs

• access to employment

• recruitment and retention

• public transport demand

• active travel investment

• workplace travel planning decisions

This is why CalCommuter takes a practical, transport planning-led approach.

Rather than simply asking “what are our commuting emissions?”, the platform helps organisations ask:

• How do staff travel today?

• Which alternatives are genuinely viable?

• Where do opportunities cluster?

• Which worksites or groups should be prioritised?

• What practical interventions could make a difference?

Good emissions data is useful. But it becomes much more valuable when it supports better decisions.

Homeworking remains part of the picture

Hybrid working has changed how organisations need to think about workplace travel.

Fewer commuting days can reduce travel emissions, but homeworking also has an emissions impact through additional energy use.

CalCommuter includes both commuting and homeworking emissions because looking at one without the other gives an incomplete picture.

The aim is not to assume that homeworking is automatically better or worse. The aim is to provide a more complete evidence base so organisations can understand the overall impact of different working patterns.

Our approach

CalCommuter uses official UK Government conversion factors alongside journey analysis, employee survey data and viability rules to provide practical workplace travel insight.

The platform is not designed to tell employees how they should travel.

It is designed to provide clear, useful information so that employees and employers can make better-informed decisions.

That means:

• using current official emissions factors

• comparing current commutes with realistic alternatives

• considering cost, time and emissions together

• including homeworking where relevant

• helping organisations move from measurement to action

The 2026 Government conversion factors are now live in CalCommuter, supporting new surveys and analysis for the 2026 reporting year.

CalCommuter helps organisations understand how staff commute today, and how they could travel tomorrow.