Work out lift sizing instantly with clear inputs, formula shown and shareable results.
Lift provision is judged on five minute handling capacity: the share of the building population a group of lifts can move in a peak five minute window, typically 11-15 percent for an office. Each lift moves 80 percent of its rated capacity per round trip, and round trip time grows with the number of floors and the passenger transfer time at each stop.
Round trip time
RTT = door and start time + 2 x floors x flight time + loaded passengers x transfer time
Handling capacity
Per lift = 300 / RTT x loaded passengers; lifts = ceil(population x target / per lift)
Preliminary estimate only. Lift traffic analysis should be carried out with proper simulation by a vertical transportation specialist.
RTT = door and start time + 2 x floors x flight time + loaded passengers x transfer time. Lift provision is judged on five minute handling capacity: the share of the building population a group of lifts can move in a peak five minute window, typically 11-15 percent for an office.
Passengers stop boarding well before the car is physically full. Traffic studies consistently show 80 percent as the practical loading in normal use.
This calculator takes 4 inputs: Building population, Floors served above ground, Target five minute handling capacity, Car capacity. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.