✓ Majority Formed: 165 / 300
Coalition Plenary Strength 165 / 300 Seats (55.0%)
151 Needed for Majority
+14 Surplus / Deficit
3 Partners in Govt
Plenary Chamber Hemicycle
All Parties
Majority Coalition Hemicycle
Governing Majority
Government Coalition (165)
Opposition / Crossbench (135)
Majority Threshold Line

Parties & Seat Apportionment

Color Party Name Vote % Seats Coalition
Chamber Total 100.0% 300
Tip: You can edit either the Vote % (which automatically distributes seats using the largest remainder method) or directly adjust seat totals. Toggle the Coalition switch to test parliamentary confidence votes.

How Parliamentary Coalition Hemicycles Work

In parliamentary democracies governed by proportional representation, a single party rarely wins an outright majority of seats. Forming a stable executive cabinet requires building a legislative coalition capable of passing confidence motions, supply bills, and national budgets.

The round plenary hemicycle (semicircular chamber design) arranges legislators along concentric tiers, typically reflecting ideological distribution from left to right. This calculator models both the full plenary layout and the resulting coalition balance:

Whether testing coalition combinations for the German Bundestag, the French Assemblée Nationale, or a local municipal council, this tool allows immediate evaluation of parliamentary stability and surplus cushion against potential backbench rebellions.