This was the next election succeeding the events of the 2001 EDSA Revolution that deposed Joseph Estrada from the presidency; his vice president, Gloria Macapagal Arroyo became president, and her party, Lakas NUCD-UMDP, and by extension the People Power Coalition (PPC), dominated the midterm elections winning majority of the seats in the Senate and in the House of Representatives.
In this election, there are 209 seats voted via first-past-the-post in single-member districts.
In 2000, the Supreme Court ruled the 2%–4%–6% method of allocating seats as unconstitutional.
It held the 2% electoral threshold for winning a guaranteed seat as constitutional.
The product, disregarding decimals (it is not rounded), will be the number of seats a party will get.