Use the calculator to convert between common force units (daN, kN, N, kgf, lbf), relate lashing capacity (LC) to minimum breaking load/strength (MBL/MBS) where applicable, and estimate required lashings/straps using simplified EN 12195-1 and US FMCSA rules. Results are estimates for educational purposes only—always follow the lashing label, applicable standard/regulation, and the manufacturer’s instructions.
Lashing Capacity Formula
Lashing capacity (LC) is normally stated directly on the lashing label by the manufacturer. If you only have the minimum breaking load/strength (MBL/MBS), many EN 12195 product standards use a 2:1 relationship as a rule of thumb (always verify against the product label/standard).
LC \approx \frac{MBL}{2}- Where LC is the lashing capacity (a force rating), typically marked in daN (or kN)
- MBL (or MBS) is the minimum breaking load/strength (force), in the same units
To estimate LC from a breaking value, divide the MBL/MBS by 2 (common for many lashings). Note: daN is a unit of force (1 daN = 10 N) and is close to kgf as a “weight-equivalent” under standard gravity (1 daN ≈ 1.02 kgf).
What is a Lashing Capacity?
Definition:
Lashing capacity (LC) is the maximum rated restraining force a lashing assembly is designed to provide in use (typically stated in daN or kN). It is a force rating—not a mass/weight value in kg—and the actual securing effect depends on angles, friction, and the securing method.
How to Calculate Lashing Capacity?
Example Problem:
The following example outlines the steps and information needed to estimate lashing capacity when only a breaking value (MBL/MBS) is available.
First, determine the minimum breaking load/strength (MBL/MBS) from the lashing label or manufacturer. In this example, the lashing has an MBL of 10,000 daN.
Next, use the relationship above to estimate the lashing capacity.
LC ≈ MBL / 2
LC ≈ 10,000 / 2
LC ≈ 5,000 daN (≈ 50 kN)
