How to Estimate Materials for a Woodworking Project

Turn the plan into a shopping list before you reach the lumber aisle.

Start with the finished dimensions

Confirm the project's final width, height and depth. Make sure those dimensions fit the room before calculating anything else.

Separate the cut list from the shopping list

A cut list describes finished parts. A shopping list must account for the stock sizes you can actually buy, saw kerfs, trimming, defects, grain selection and layout.

Group by material

List solid lumber by species and thickness, sheet goods by thickness, then hardware, fasteners, glue and finish. Do not mix nominal lumber names with actual measured dimensions.

Lay parts onto stock

For plywood, sketch or use a cut-layout tool so large parts fit on full sheets. For boards, assign the longest and most appearance-critical pieces first, then fit smaller parts around them.

Add a sensible contingency

The right allowance depends on material quality, grain matching, defects and your process. Rather than using a fake universal percentage, inspect the stock and buy enough to cover the real layout and likely waste.

Check the plan one more time

Before purchase, reconcile the material list against the drawings and read the complete plan.