Senedd Projection

Input your expected vote shares for all parties to see how many seats they could win. This creates a complete constituency level projection.

Just make sure they sum to 100%

Preset Examples

Input your projected vote shares for each party

Party

Vote Share

Party

Vote Share

Labour
Conservatives
Plaid Cymru
Liberal Democrats
Greens
Reform
Other

Disclaimer

This is not an official prediction. Instead, it is an educational tool to visualise how the next Senedd could look under certain scenarios using proportional swing. This is the first election to use this electoral system and these boundaries so the baseline numbers are an amended version of the estimated results created by Jac Larner.
Because it is the first election under the new system it is particularly unpredictable and the projection assumes that all parties will contest every constituency. There are other methods which could be used to create projections which may create different results, including those made by Jac. 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. To find your constituency visit the UK Parliament constituencies page, or to register to vote, visit gov.uk.

Polling Trends

The chart below shows polling trends for major Welsh political parties over time. It begins after the new one ballot electoral system was confirmed in May 2024. Data is sourced from various polling companies and election results. Hover over data points to see more information about each poll.

Labour
Conservatives
Plaid Cymru
Liberal Democrats
Greens
Reform
Other

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