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OBRAS ONSITE · free site calculator · working at heights

Fall Clearance Calculator

A harness only saves you if there's room to fall. This is the number most people get wrong: the minimum clear distance below your anchor before you hit something.

Your setup

Lanyard length (m) Energy absorber extension (m) Height, D-ring to feet (m) Safety margin (m) Anchor above D-ring? (m above = 0)
Read this bit: anchoring at foot level can double your free fall and MOST lanyards aren't rated for it - anchor above the D-ring wherever possible. Verify against AS/NZS 1891 and the manufacturer's data for YOUR harness, lanyard and absorber; swing fall adds distance this calculator doesn't. If clearance isn't there, change the system - rated anchor point higher, retractable (SRL), or work positioning instead.
Grab the FREE Obras SWMS sample to go with it · All free tools →

This is a practical site-management tool. It is not legal, engineering or regulatory advice and does not guarantee compliance or a satisfactory inspection outcome. Requirements may vary by jurisdiction, project, contract and circumstances.

Want a person to look at it?

The tools above are free and yours to use. When you need the paperwork behind them reviewed by someone who has run sites, Obras HSE Services is a live consulting business in south-east Queensland.