Work at Height – Fall Clearance & Scaffold

10Fall Clearance Calculator

Required clearance below the anchor = Lanyard + Deceleration + Worker height + Harness stretch + Safety margin. Compare against the actual fall distance to see if the worker would impact a lower level.

Lanyard type i

Lanyard length (m)

Deceleration distance (m) i

Worker height — D-ring to feet (m)

Harness stretch (m)

Safety margin (m)

Distance from anchor to nearest lower level (m)

Required vs available clearance

— m required

— m available

—

11Scaffold Load Calculator

Compare planned load (workers + tools + materials) against the duty rating chosen for the scaffold platform. Duty ratings follow OSHA 1926.451 / EN 12811-1.

Scaffold type

Bay length (m)

Bay width (m)

Duty rating i

Number of workers on platform

Average worker mass + tools (kg)

Materials stacked on platform (kg)

Result

Platform area—

Permitted total load—

Planned total load—

Distributed planned load—

Utilisation—

—

Inspection reminders

Daily pre-use scaffold tag check by competent person.
Toe-boards, mid-rails and top-rails on all open sides.
Secure base plates / mud sills on stable ground.
No mixing of components from different manufacturers.

22Ladder Angle (4:1) Calculator

Single & extension ladders should sit at the standard 1:4 ratio (≈ 75.5°). Enter the working height to find the correct base setback, ladder length and required overlap above the landing per OSHA 1926.1053 / EN 131.

Working / landing height (m)

2 m6.0 m14 m

Required extension above landing i

Ladder type

Single Extension Step

Base condition

Level / firm Uneven / soft Slippery

Tie-off / securing i

Tied off Not tied

Ladder geometry

— ° from horizontal

—

Base setback (1:4)—

Min ladder length—

Overlap above landing—

Notes—

For training purposes only. Scaffold loads must be authorised by a Competent Scaffold Inspector. Fall-arrest plans must be reviewed by a Qualified Person per ANSI Z359.