Science project

Determining the Ages of Trees


  • Trees (choose a variety)
  • Tape measure
  • Pen and paper
  • A “growth factor” chart for trees

Note: If you happen to stumble across a tree stump, take the time to identify the tree and count the rings in the trunk to find out the age of the tree.


  1. Find an area that has a variety of trees (park or playground).
  2. Find your first tree sample, and at approximately three to five feet from the ground, measure the circumference of its trunk.
  3. Find about four more types and sizes of trees and record their types and circumferences.
  4. Follow this formula to calculate the diameters of the trees: Diameter = Circumference divided by 3.14 (pi).
  5. Multiply the diameter of each tree by its growth factor (found on Growth Factor Chart) to calculate the approximate age of the tree.
Disclaimer and Safety Precautions provides the Science Fair Project Ideas for informational purposes only. does not make any guarantee or representation regarding the Science Fair Project Ideas and is not responsible or liable for any loss or damage, directly or indirectly, caused by your use of such information. By accessing the Science Fair Project Ideas, you waive and renounce any claims against that arise thereof. In addition, your access to's website and Science Fair Project Ideas is covered by's Privacy Policy and site Terms of Use, which include limitations on's liability.

Warning is hereby given that not all Project Ideas are appropriate for all individuals or in all circumstances. Implementation of any Science Project Idea should be undertaken only in appropriate settings and with appropriate parental or other supervision. Reading and following the safety precautions of all materials used in a project is the sole responsibility of each individual. For further information, consult your state's handbook of Science Safety.

Add to collection

Create new collection

Create new collection

New Collection


New Collection>

0 items