Free tools for tree work

Quick calculators and finders for climbers, riggers and saw hands. They run in your browser and are free to use.

Climbing Kit Builder

Pick your climbing system and budget, get a complete, compatible kit list you can add to your cart in one click.

Estimate the weight of a log by species and size, see the shock load of a drop, and size your rope and sling with a working-load margin.

Measure a tree from the ground with an angle and a distance, then see how much rope a doubled or single-line climb needs.

Exactly how much 2-stroke oil to add for any can size and ratio, in ounces and milliliters.

Decode an NGK part number letter by letter, then diagnose your saw from the color of the plug tip.

Match chain pitch to the right round file and depth gauge, and estimate drive links for your bar length.