Election 2010: Seat calculator

The Brief

In 2010 voting in the UK changed from the “first past the post” convention to the Alternative Voting system. As part of the elections team I helped to create a product that would explain to BBC users how the new voting system worked.



+ An interactive tool that demonstrated how a percentage vote share would result in seats in parliament

+ The interface was driven by an interactive pie chart thats changes were interpreted in a visualisation of seats in parliament

+ The BBC’s nationwide audience was served by a map that was based on proportional representation powered by an algorithm that showed how constituencies would changed based on the segmentation of the pie chart


seat_sketch Sketch of pie chart


vote_share % vote share to number of seats



seat_calc_fullSeat Calculator interactive