How many boards for a 4×8 raised garden bed?
A 4 × 8 ft raised bed two 2×6s high takes 6 × 2×6 boards, 8 ft long. Four stay whole as the long sides; the other two are cut into the four 45 in ends, two per board with about 5-3/4 in left over.
How to work it out
- 4 × 96 in + 4 × 45 in = 47 ft of parts, packed to fill each board as full as it will go → 6 boards (2% offcut and kerf)
The 4 × 8 ft bed is the classic size because you can reach the middle from either side and the long sides are whole 8 ft boards — no cutting at all. Only the ends need the saw.
Adjust for your project
More options: Kerf · Trim · Price per board (optional)
- Boards needed
- 6 boards · 2×6
- Pieces placed
- 8 pieces
- Offcut and kerf waste
- 2%
- Total length of pieces
- 47 ft
| Boards | Cut these lengths (in) | Offcut left |
|---|---|---|
| 4 boards | 96 | none |
| 2 boards | 45 + 45 | about 5-3/4 in |
4×8 raised bed by height (8 ft 2×6s)
| Height | Boards needed | Offcut and kerf waste |
|---|---|---|
| 1 board high (5-1/2 in) | 3 boards | 2% |
| 2 boards high (11 in) | 6 boards | 2% |
| 3 boards high (16-1/2 in) | 9 boards | 2% |
What to know about cutting a 4×8 bed
The ends go inside the sides, so they are shorter than 48 in. A 2×6 is actually 1-1/2 in thick, and the two long sides cover 3 in of the width: 45 in + 2 × 1-1/2 in = 48 in outside. Cut the ends 48 in long and the bed comes out 51 in wide — and the four ends no longer fit two to a board, because 48 in + a kerf + 48 in is more than 96 in.
Two 2×6s stacked make a wall 11 in tall (each board is 5-1/2 in, not 6). Inside, the soil space is 45 in × 93 in × 11 in, about 26.6 cubic feet — just under 1 cubic yard. Work out the soil mix and bags on Easy Garden Calc (opens in a new tab), whose raised bed soil calculator (opens in a new tab) takes the same inside size.
Measure the 8 ft boards before you buy. The long sides are used whole, so if one board is a little long, trim all four to match or the bed will be out of square. Set an end trim above and the sides drop out of the list, because a trimmed 8 ft board is shorter than a 96 in piece — buy 10 ft boards if you want to square the ends.
Hold the corners together with a short post inside each corner: a 4×4 or 2×4 cut 11 in long gives the screws something to bite into besides end grain. Eight feet of wet soil pushes the long sides outward, so a stake driven outside the middle of each side, or a cross-tie across the middle, keeps them straight. Cedar and redwood resist rot without treatment; if you use pressure-treated lumber, choose boards rated for ground contact.
The same kerf arithmetic, where it does bite, is in How many 24 in pieces from an 8 ft board.
Different size? Use the full Cut List Calculator.
What you’ll need
- Circular saw (7¼ in)Mid-range price
The most versatile first power saw: crosscuts framing lumber, rips boards and, with a straightedge, breaks down plywood sheets.
See options on Amazon (opens in a new tab) - Speed square (7 in)Budget price
Marks square and angled crosscuts and doubles as a saw guide for a circular saw. The degree scale is handy for rafters and stair angles.
See options on Amazon (opens in a new tab) - 25 ft tape measureBudget price
A 25 ft tape with a stiff blade and a readable 1/16 in scale covers everything from cut lists to deck layout.
See options on Amazon (opens in a new tab)
As an Amazon Associate we earn from qualifying purchases. Links to products are affiliate links — they cost you nothing extra and help keep these calculators free.
Frequently asked questions
Why are the end boards of a 4×8 raised bed 45 in long?
Because they sit between the long sides. Each 2×6 side is 1-1/2 in thick, so 45 in of end board plus 3 in of side boards makes the 48 in outside width. If the ends overlap the sides instead, cut the ends 48 in and the long sides 93 in.
How much soil fills a 4×8 raised bed two 2×6s high?
About 26.6 cubic feet, just under 1 cubic yard: the inside is 45 × 93 in and the wall is 11 in tall. Soil settles, so plan to top it up; Easy Garden Calc (opens in a new tab) works out the mix and the bags.
How many 8 ft 2x6s for a 4x8 raised bed three boards high?
9 boards: six whole boards for the sides and three cut into six 45 in ends, for a wall 16-1/2 in tall.
How many 8 ft 2x6s for a 4x4 raised bed two boards high?
4 boards. Two 48 in sides will not come from one 96 in board once the kerf is counted, so each board gives one 48 in side and one 45 in end, with about 2-3/4 in left.
Other common sizes
- How many 24 in pieces from an 8 ft board — 3 pieces
- How many 16 in pieces from an 8 ft 2x4 — 5 pieces
- Cut list for a 30 in wide bookcase — 2 × 1×12 boards, 8 ft long
Sources
- NHLA Rules for the Measurement & Inspection of Hardwood & Cypress (2019), rules 14 and 16 (opens in a new tab) — Standard thickness for surfaced lumber: 4/4 S2S to 13/16 in, 5/4 to 1-1/16, 6/4 to 1-5/16, 8/4 to 1-3/4, 10/4 to 2-1/4, 12/4 to 2-3/4 in (rule 14); board feet are measured on the rough size, before surfacing (rule 16).