Question 1

How do I calculate board feet for lumber?

Accepted Answer

Board feet = (Thickness in inches × Width in inches × Length in feet) ÷ 12. For example, a 2×4×8 board is (2 × 4 × 8) ÷ 12 = 5.33 board feet. This calculator does this automatically for your cut list.

Question 2

What lumber dimensions do I need for deck framing?

Accepted Answer

Typical deck framing uses 2×10 or 2×12 joists spaced 16" on center, 4×4 posts, 2×8 or 2×10 beams, and 2×6 or 5/4×6 decking boards. Exact sizes depend on span and local codes.

Question 3

How much does pressure-treated lumber cost?

Accepted Answer

Pressure-treated lumber typically costs $2-6 per board foot depending on size and grade. Larger dimension lumber (4×6, 6×6) costs more per board foot than standard 2×4s or 2×6s.

Question 4

What is the difference between nominal and actual lumber sizes?

Accepted Answer

Nominal size is the name (like 2×4), actual size is the real dimensions after planing. A nominal 2×4 actually measures 1.5" × 3.5". This calculator uses actual dimensions for accuracy.

Question 5

Should I include extra lumber for waste?

Accepted Answer

Yes! Add 10-15% extra for cuts, mistakes, warped boards, and future repairs. Complex projects with many cuts need more waste allowance than simple straight cuts.

Lumber & Framing Calculator

Select Project Type

Project Dimensions