London Assembly Election Projection

Input your expected vote shares for all parties on both the List and the Constituency ballots to see how many seats they could win. This creates a full projection and a list of every constituency winner.

Just make sure both your constituency and list inputs sum to 100%.

Input your projected vote shares for each party

Party

ConstituencyConst..

List^{iThere is a cut off on the list
so parties under 5% will get 0 seats regardless of the D'Hondt calculation.}

Conservatives

Labour

Greens

Liberal Democrats

Reform

Independent

Other 1

Other 2

Disclaimer

This is not an official prediction. Instead, it is an educational tool to visualise how the next London Assembly could look under certain scenarios using proportional swing. There are other methods which could be used to create projections which may create different results. The results should not be taken as fact, in particular the final list seats are notoriously difficult to model due to small margins. There may also be local issues which impact results and swings can be irregular.
You can find your constituency at Who Can I Vote For? , or to register to vote visit gov.uk. For more information on the system read our blog here.
We do not project the Mayoral election. It is a single seat decided by most votes wins, so the result would just be a bar chart of the user’s input.

Polling Trends (Updated 24/6/2025)

The chart below shows polling trends for major London political parties over time, however polling for the London Assembly is very rare. Data is sourced from various polling companies and election results.

London Assembly Election Projection

Preset Examples

Input your projected vote shares for each party

Party

ConstituencyConst..

List^{iThere is a cut off on the list
so parties under 5% will get 0 seats regardless of the D'Hondt calculation.}

Disclaimer

Polling Trends (Updated 24/6/2025)

London Assembly Polling

List Vote Polling

Constituency Vote Polling

London Assembly Election Projection

Preset Examples

Input your projected vote shares for each party

Party

ConstituencyConst..

ListiThere is a cut off on the list so parties under 5% will get 0 seats regardless of the D'Hondt calculation.

Disclaimer

Polling Trends (Updated 24/6/2025)

London Assembly Polling

List Vote Polling

Constituency Vote Polling

List^{iThere is a cut off on the list
so parties under 5% will get 0 seats regardless of the D'Hondt calculation.}