Walk the planned fence line and write down each straight segment. Record gate openings separately because they reduce mesh length but require gate-terminal conditions.
Use one consistent unit system. For irregular yards, keep a simple sketch with each segment labelled so you can check the entered list later.
Materials to verify
Mesh, rails, posts, wire, and gates are predictable starting quantities. Brace bands, tension bands, caps, ties, and other fittings depend on the chosen system and should be verified with product instructions.