Zero public stairs. The Burj Khalifa (formerly Burj Dubai) has no publicly accessible staircase due to fire-safety and evacuation regulations for supertall buildings.
Vertical transport is provided by 57 elevators (including double-deck units) and 8 escalators. The world’s fastest elevators reach 10 m/s (33 ft/s), taking visitors to the 124th/125th floor observation decks in ~60 seconds.
Maintenance and emergency stairs exist within the core for authorized personnel only.