Free tree tools
A tree identification key and calculators that run in your browser, with the method and its sources written underneath.
Free toolTree age calculatorEstimate a tree's age from its trunk with the growth-factor method: 39 species, metric or imperial, with the formula and its limits shown.
Free toolTree height calculatorWork out how tall a tree is from a distance and an angle, or with just a stick. Four field methods from the American Forests champion tree guidelines.
Free toolTree identification keyName a US tree by answering paired questions about needles, leaves, bark and fruit. 26 trees, a not-sure route at every step, and a printable list.