Fall clearance worksheet
Add the clearance components specified by your selected fall-arrest system and compare the sum with available clearance.
Enter your values
Check this tool fits your task
Use only with manufacturer instructions that specify this additive method and the same reference surface. Not a universal lanyard or self-retracting lifeline calculator. No equipment values are assumed.
Your result
Enter your values, or try the example to see how it works.
Calculation breakdown
What to do next
Method and sources
Required clearance = free fall + deceleration + harness/body allowance + other allowances + safety margin. Difference = available clearance − required clearance.
3M Protecta user instructions: system-specific clearance methods ↗
How to use this tool
- Check the scope and collect measured or verified input values.
- Enter values using the displayed units, then calculate.
- Read the result, calculation breakdown and next steps together.
Worked example
Fictional worksheet: 1.8 + 1.2 + 0.5 + 0.3 + 1 = 4.8 m. Available 4 m → 0.8 m shortfall. These values are not equipment recommendations.
The example button fills illustrative values. Where a scope confirmation is shown, check it yourself before calculating.
Method and references
Required clearance = free fall + deceleration + harness/body allowance + other allowances + safety margin. Difference = available clearance − required clearance.
Use only with manufacturer instructions that specify this additive method and the same reference surface. Not a universal lanyard or self-retracting lifeline calculator. No equipment values are assumed.
Common questions
Can I use this with any SRL?
No. Many systems require product-specific charts or different geometry. Use that method directly when it differs from this worksheet.
Does surplus clearance mean safe?
No. It only compares the values entered. Swing fall, anchor position, equipment compatibility, obstacles and rescue still need checking.
Which surface do I measure from?
Use the reference surface defined in your selected equipment instructions for every term and available clearance; do not mix anchor-level and working-surface methods.
Public beta · Check the method and inputs with a competent reviewer before operational use.
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