Wrapping a bare winch line around a trunk girdles the tree and cuts your line. Enter winch capacity and trunk diameter for the strap width and length that spread the load safely, and why width matters most.
Tree Saver Strap Calculator — Get the Right Width and WLL for Your Winch
A tree saver that’s too narrow damages bark and can be cited by land managers. One that’s too narrow for the load can also fail.
Enter your winch line pull rating and tree diameter. The calculator returns the minimum tree saver strap width and WLL required for your recovery.
Land management agencies require minimum tree saver widths to prevent bark damage. TREAD Lightly guidelines specify both width and WLL to be appropriate for the tree diameter.
Winch users, trail riders, and off-road recovery operators using trees as anchor points.
- TREAD Lightly tree protection guidelines
- SAE J1881 recovery equipment standards
- Land management agency requirements
Disclaimer: This tool is provided for educational and informational purposes only and does not constitute legal, safety, or professional advice. Sunferno Automotive Accessories cannot verify how products are installed, used, or attached in your specific vehicle or situation — proper installation, use, and securement are solely the responsibility of the user. Laws and regulations vary by jurisdiction and change over time; always confirm current requirements with your local authorities or a qualified professional. Sunferno products must be used strictly in accordance with manufacturer instructions and applicable regulations.