Fall Distance Calculator

Required Fall Clearance per OSHA 1926.502 & ANSI Z359

Distance Units

Formula (OSHA OTM Section V Ch. 4): Required Clearance = Free Fall + Deceleration Distance + Harness Stretch + Worker D-ring Height + Safety Factor
If anchorage is below the D-ring, the free-fall distance grows beyond the lanyard length — and may exceed the OSHA 6 ft (1.83 m) maximum.

⚠ Important — Planning Tool, Not Engineering Substitute Fall protection systems must be designed, installed, and inspected by a qualified person per 29 CFR 1926.502 and ANSI Z359.2. This calculator provides estimates for educational and planning purposes only. Always verify clearance with the manufacturer’s specific spec sheet for your equipment, conduct a site-specific hazard assessment, and consider swing fall, edge effects, and rescue plans. The author and FieldSafetyTalk.com assume no liability for decisions made using this tool.

1. Fall Protection System

System Type (presets fill typical values — verify with manufacturer)

Lanyard / Connector Length (ft)

Anchor Position (height of anchor above D-ring; ft)

2. Deceleration & Harness

Deceleration Distance (max 3.5 ft per OSHA)

Harness Stretch (max 1.5 ft per ANSI Z359.11)

3. Worker & Safety Margin

Worker D-ring to Foot (default 5 ft for 6-ft worker)

Safety Factor (ANSI recommends 2 ft minimum)

4. Available Clearance (Optional)

Distance from D-ring to Lower Level (optional — to compare against required clearance)

Please enter valid distance values.

Required Fall Clearance Below D-ring

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Sources: OSHA 29 CFR 1926.502(d); OSHA Technical Manual Section V Chapter 4; ANSI/ASSP Z359.11 (harness), Z359.13 (energy absorbers), Z359.6 (system specifications).

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