The polls also show the opposition bloc, called the Nation Alliance, leading the parliamentary race, at least six points ahead of Erdogan's AK Party (AKP) and its allies.
Erdogan faces the biggest challenge to his 20-year rule after the erosion of his popularity during a cost-of-living crisis.
A poll conducted on March 6-7 by Alf Research showed Kilicdaroglu at 55.1% and Erdogan on 44.9%.
The main opposition bloc earned 43.5% of votes, while the HDP got 11.3%, that poll showed.
The main opposition bloc got 46.4%, while the AKP and MHP earned 37.8%, the poll, published on March 10, showed.
ORC Research showed Kilicdaroglu ahead with 56.8% and Erdogan on 43.2%, according to a poll conducted on March 4-6, before Kilicdaroglu was officially announced as the opposition candidate.
Reporting by Jonathan Spicer and Ece Toksabay; Additional reporting by Ali Kucukgocmen; Editing by Daren Butler and Angus MacSwan. »