🪚 Benchwork Lumber Calculator
Enter your layout's outer dimensions and how many cross braces you plan to use to estimate the total linear feet of lumber needed for the benchwork frame.
How the linear feet are added up
The tool frames a rectangle and drops braces across it:
perimeter = 2 x (length + width)
braces = count x brace length
total = perimeter + braces
2 x (8 + 4) = 24 ft frame
3 x 4 ft = 12 ft of bracing
total = 36 ft of lumberThat is framing stock only. Legs, leg bracing, risers, the plywood or foam top and any fascia are not in the figure - add them yourself. Buying in 8 ft lengths, 36 ft means five boards, and the offcuts cover mistakes.
Choosing brace count and brace length
Cross braces carry the top, so space them for what sits on it - 16 inch centres under 1/2 inch plywood, up to 24 inch under 2 inch extruded foam:
braces = ceiling(length in inches / spacing) - 1
96 in / 16 = 6 -> 5 interior braces on an 8 ft frame- Brace length is the inside width. With 1x4 sides, actual thickness 3/4 inch, a 4 ft frame leaves 46 1/2 inches between them - 3.875 ft, not 4. Entering the outer width overstates the total slightly, which is a reasonable waste allowance but not a cut list.
- 1x4 pine or poplar suits open grid up to about 8 ft with legs every 4 ft; 1x3 is enough for a narrow shelf; ripped 3/4 inch plywood strips stay straighter than any of them.
Frequently asked questions
How much lumber does a 4x8 layout need?
24 feet for the outer frame, plus about 4 feet per cross brace. With five braces that is 44 feet, or six 8-foot boards, before legs and the tabletop.
How far apart should benchwork cross members be?
Sixteen inches is the usual default and holds up under any top. You can stretch to 24 inches under 2-inch foam or 3/4-inch plywood, but not under thin sheet goods.
Does this include the legs?
No. Four legs at 40 inches add just over 13 feet, and diagonal leg bracing more again. Work the frame out here, then add legs as a separate order.