A lumber quantity calculator estimates how many boards, how much linear footage, and what total lumber cost your project will require before you buy material. Enter your part lengths, quantities, and stock sizes to turn a rough cut list into a practical lumber-yard shopping list.
Add one row for each unique part, then pick the stock size and board length you plan to buy.
Part Length Unit
Group matching stock together for cleaner board-count estimates.
Actual stock size
0.75 x 3.50 in
Using common actual dimensions for 1x4 lumber.
Total cut length
0.00 ft
Length x quantity for this line item.
Board feet
0.00
Useful when comparing hardwood quotes and milling needs.
Stock match
1x4 (0.75 x 3.50 in actual)
Matching stock is grouped below into one buy-list row.
Complete rows: 0 of 1
Similar stock is grouped into recommended board counts.
Add a complete part row to generate your lumber quantity estimate.
Each row needs a part length, quantity, stock size, and stock board length before the grouped buy list can calculate board counts.
Follow these steps to estimate how much lumber you need and turn your cut list into a better shopping plan.
Start with a project preset for decks, shelving, furniture, or cutting boards, or add your own custom parts from scratch.
Add the part length, quantity, stock size, board length, and optional price per board for every item you need to cut.
Increase the waste slider to account for knots, defects, milling, trim cuts, and layout mistakes before you buy material.
The calculator groups matching stock together so you can see total cut length, recommended boards to buy, estimated board feet, and projected cost.
These answers cover the most common questions about estimating boards, waste, and lumber cost.
A 10% waste factor is a strong default for many projects. Increase that to 12% to 20% for deck framing, rough hardwood, grain matching, defects, or projects with lots of short parts.
Yes. Choose dimensional stock such as 2x4, 2x6, or 2x8, enter your part lengths and quantities, and the tool will estimate how many full boards to buy at your selected stock length.
Linear feet measures total length only, while board feet measures lumber volume using thickness, width, and length. This calculator shows both so you can plan stock counts and compare hardwood pricing.
Enter the price per board for each stock line you expect to buy. The calculator multiplies your grouped board count by that unit price after adding waste so the estimate is closer to the real cart total.
Use the actual dimensions that match the stock you are buying. The preset sizes in this tool already use common actual dimensions like 1x6 = 0.75 x 5.5 inches and 2x4 = 1.5 x 3.5 inches.