Aggregate WLL Calculator

Quick Answer

This calculator totals known WLL entries and compares them with cargo weight for planning discussion only.

What this calculator does

Enter each tiedown's credited WLL value separately. The calculator sums all entered values and compares the total to the cargo weight you enter, displaying whether the aggregate appears to meet a general planning target.

Enter each tiedown individually — do not combine multiple tiedowns into a single entry. Each separate device should be a separate input so the count is visible alongside the total. Use values from manufacturer markings or carrier-approved tables only.

Direct and indirect tiedowns

The federal rule may credit direct and indirect tiedowns differently when calculating aggregate WLL. Before treating all entered values as equivalent, verify how the applicable rule (49 CFR 393.102 and any commodity section) requires each tiedown type to be credited.

This calculator does not classify entered values as direct or indirect — it adds whatever numbers you provide. If some tiedowns are indirect and should be credited at a lower value per the current rule, you must apply that adjustment before entering the values.

Recommended use

Use this calculator to check whether your planned tiedown assembly — at correctly credited rated capacities — appears to reach the aggregate WLL requirement for the cargo weight. If the total falls short, the plan needs additional or higher-rated tiedowns.

After the calculation, verify the actual requirement against the current eCFR text and carrier policy. The calculator shows whether the math adds up; it does not determine whether the securement plan is complete or compliant.

Practical Notes

This tool is a planning aid only. Verify current device ratings, applicable regulation text, and carrier policy before using any calculated result in a live securement decision.