Industrial Ladder Calculator

Ladder height and duty rating from reach requirements.

Reach height (ft)

User weight (lb)

Tool weight (lb)

Tab to move between fields

Ladder height (ft)

Duty rating (lb)375

Extension ladder (ft)14

Total load (lb)275

Step ladder (ft)8

Duty TypeIAA

How to Use This Calculator

Enter the maximum reach height (ft) — the highest point you need to work at.
Input the heaviest user weight (lb) who will use the ladder.
Add the tool weight (lb) for tools and materials carried up the ladder.
The calculator returns the Ladder height (ft) and Duty rating (lb) required per ANSI standards.
Use the Extension ladder (ft) and Step ladder (ft) outputs to select the appropriate ladder type for your task.

How the result changes with Reach height (ft)

Ladder height (ft): Minimum straight/extension ladder height.
Duty rating (lb): Required ANSI duty rating.
Extension ladder (ft): Extension ladder length (with overlap and above-landing).
Total load (lb): User plus tool weight.
Step ladder (ft): Required step ladder height.

Identify Input Parameters
Reach height (ft) = 12, User weight (lb) = 250, Tool weight (lb) = 25 = 3 input(s) provided
Calculate Ladder height
Ladder height = ceil(ladderHeightFt)
8 = 8
Calculate Duty rating
Duty rating
375 = 375
Calculate Extension ladder
Extension ladder = ceil(extensionLadderFt)
14 = 14