Ratchet Strap Calculator
How many straps do I need? EN 12195 method with strap angle correction, for fleet & trailer transport.
Log load securing checks and transport records against every asset — free.
Calculate straps needed
Total mass of the load being secured
LC (Lashing Capacity) — shown on the blue label, in daN (1 daN ≈ 1 kg)
Shallower angles reduce effective strap capacity significantly
This calculator uses the EN 12195-1 simplified method for top-over lashing. For loads over 5,000 kg or specialist transport, consult a qualified load securing assessor.
Enter load weight
Results appear here instantly
Why strap angle matters — and why it's often overlooked
A ratchet strap only develops its full rated LC when it runs at 90° to the trailer bed — perfectly vertical. In practice, straps on a flat trailer typically run at a much shallower angle because the lashing points are at the same height as the trailer floor. At 45° (the typical angle on most flat trailers), the strap only delivers 71% of its rated LC as useful vertical and forward restraint.
90°
100%
Full rated LC
45°
71%
of rated LC
30°
50%
of rated LC
Never strap at less than 30° to the horizontal. Below this angle the strap contributes almost nothing to keeping the load on the trailer and is more likely to chafe on edges. Raise lashing points using stanchions, headboards, or purpose-built strap anchor points to steepen the angle.
UK law on load securing — what DVSA looks for
Under the Road Vehicles (Construction and Use) Regulations 1986 and Highway Code Rule 98, all loads on UK public roads must be properly secured. DVSA officers can stop and inspect any vehicle at any time — and can prohibit it from moving if the load securing is inadequate.
All straps must carry a legible EN 12195-2 blue label
A strap with a faded or missing label has no legally recognised LC figure. Replace it.
Lashing points must be structural
Body panels, fuel tanks, and non-rated hooks are not legal lashing points. Use purpose-built D-rings or manufacturer-designated chassis points.
This applies to all road movements — even short ones
Moving machinery half a mile between sites on a public road requires compliant load securing. Distance does not reduce the legal obligation.
A load that falls from a vehicle is a criminal matter
Prosecution under the Road Traffic Act is possible. The driver, operator, and vehicle owner can all be liable.
Frequently Asked Questions
Track Load Securing Checks Across Your Fleet
FleetBolt lets you store key specs and compliance records against every vehicle and machine, free to get started.
Get Started Free