About this site
Raised Bed Plans is a single purpose tool built to answer one recurring question before building a raised garden bed: exactly which boards to cut, how many standard boards to buy, what hardware to get, and how much soil it takes to fill it. Instead of a generic size chart, this site's configurator calculates a full cut list from the length, width, and height you actually want, using the real milled dimensions of the lumber rather than its nominal size.
What the free configurator does
Enter an outside length, width, and height, and pick cedar, pine, or redwood, and the configurator returns the long and end wall board lengths for every course, the corner post length, whether a center brace is needed, how many standard 8, 10, or 12 foot boards to buy with the leftover offcut, an estimate of screws and corner brackets, and the soil volume in cubic feet, cubic yards, and bag count, all updated instantly without reloading the page.
The free 4x2 Starter Plan
Alongside the configurator, a one page printable plan for the most common first bed size, 48 by 24 inches, is available after providing an email address, with a dimensioned diagram, cut list, and the six step build sequence.
The Raised Bed Build Pack
For anyone building more than one bed, the paid Raised Bed Build Pack is a 28 page reference covering six complete plans, a 4x2, a 4x4, a full size 4x8, a narrow 2x8, a waist height bed on legs, and an L-shaped bed, each with a top view, an exploded view, a cut list, hardware, an assembly sequence, and build variants, plus a chapter on choosing wood and its real lifespan in soil contact.
Independence and accuracy
This site is not affiliated with any lumber yard or wood supplier. Lifespan figures for cedar, pine, and redwood used throughout the site describe typical ranges for untreated wood in soil contact; actual lifespan depends on climate, moisture, and the specific board, which is why the site consistently describes these figures as typical ranges rather than a guarantee.
Questions
Anything unclear about the configurator, the free plan, or the Build Pack can be sent through the contact page.
How to use the numbers before you cut
Treat the calculator output as a shop worksheet, not as a guess to adjust at the saw. First choose the bed position and measure the actual space with a tape, including room to walk around it. A practical working path is 24 inches wide for one person with a watering can, and 36 inches is more comfortable if you will use a wheelbarrow. Keep the bed width at 48 inches or less when you can reach it from both sides, or 24 to 30 inches when it sits against a fence or wall.
After entering the outside length, width, and height, read the cut list from the longest parts to the shortest parts. Mark each board with a pencil before cutting any piece. Write the final part name on the offcut as soon as it is cut, for example long side, end side, post, or brace. This prevents two common errors: using a clean offcut for the wrong part, and cutting all short pieces before the long pieces are safely assigned.
Cut one course first, place it on flat ground without screws, and measure the two diagonals. If the diagonals differ by more than 1/4 inch on a small bed or 3/8 inch on a 4 by 8 foot bed, square the layout before continuing. It is faster to correct a dry fit than to pull screws from a completed corner. If a dimension or term is unclear, check the FAQ before buying material.
Equipment, tolerances, and working dimensions
A raised bed does not require cabinetmaking accuracy, but it does need repeatable measuring and square corners. Use a tape measure, pencil, speed square, saw, drill or driver, drill bits for pilot holes, clamps, work gloves, and eye protection. A flat driveway, patio, or two sawhorses gives better results than cutting directly on grass. If using a circular saw, support both sides of the cut so the board does not pinch the blade or tear out at the end.
Allow for normal site tolerances. Lumber can vary slightly in width and thickness, and damp boards can move as they dry. For a garden bed, a cut within 1/16 inch is excellent, within 1/8 inch is usually workable, and an error near 1/4 inch may show at the corner or change the soil line. Pre drill near board ends, especially within 1 inch of an end grain edge, to reduce splitting.
| Item to check | Practical figure | Why it matters |
|---|---|---|
| Reach from one side | 24 inches is comfortable for most adults | It sets the maximum usable half width of a bed reached from both sides. |
| Path beside bed | 24 to 36 inches | It leaves room for planting, watering, harvesting, and moving soil. |
| Diagonal difference before fastening | Under 1/4 inch on small beds, under 3/8 inch on long beds | It confirms that the rectangle is square enough before screws lock it in place. |
| Typical soil settling after first watering | About 1 to 2 inches in many loose mixes | It explains why a bed filled level may sit lower after the first soaking. |
| Cut accuracy target | 1/16 to 1/8 inch | It keeps courses aligned without requiring furniture grade work. |
Frequent mistakes and how to recover
The most expensive mistake is buying boards before deciding whether the stated size means inside dimensions or outside dimensions. Always keep one convention through the whole job. If boards are already cut and the bed comes out smaller inside than expected, do not trim every piece again. Use the bed as built, then adjust the planting layout, because losing 1 or 2 inches inside a bed is usually less serious than shortening a whole set of boards unevenly.
A second common mistake is fastening every corner tight before checking level ground. If the bed rocks, loosen the lowest course, rake or scrape the soil beneath the high points, and reset it. Do not solve a twisted base by forcing the upper courses into line, because the twist will remain visible and can open gaps.
If a board is cut too short by less than 1/4 inch, place that piece where the end is captured by a post or adjoining board, then keep the reveal even. If it is short by more than 1/2 inch, save it for a brace, spacer, stake, or future repair. Do not hide a large gap with extra screws, because screws clamp wood, they do not restore bearing length.
- If the bed is out of square, loosen one corner, push the long diagonal inward, and recheck both diagonals before driving final screws.
- If a screw splits the board end, remove it, drill a pilot hole farther from the edge, and clamp the split closed before refastening.
- If soil volume was underestimated, fill the lower layer first and leave the top 2 inches low until more mix is available.
- If a long side bows outward during filling, stop filling, add the planned brace or temporary clamp, then continue in shallow layers.
Special cases worth planning before purchase
Sloped ground needs a different sequence than level ground. Set the bed level if irrigation and appearance matter, then backfill under the low side with compacted mineral soil or gravel before adding growing mix. On a mild slope of 1 inch across the bed, this is simple. On a slope of 4 inches or more, consider stepping beds rather than building one tall exposed side.
For beds near fences, leave enough clearance to drive screws and maintain the outside face. A 6 inch gap may be enough for airflow, but it is not enough for a drill and hand. Where access is limited, assemble the wall sections in the open, move them into place, and fasten the final corners from inside the bed.
For very tall beds, filling weight becomes the main issue. Moist soil can place strong outward pressure on long sides, especially during the first watering. Use braces where the plan calls for them, fill in layers, and check the sides after every 6 to 8 inches of depth. For answers to edge cases not covered here, use the FAQ as the first reference point.
Read next
- 4x8 raised bed plan guide: What to know before building a 4x8 raised bed, including why it needs a center brace, its soil volume, and how it compares to two smaller beds.
- L-shaped raised bed layout ideas: How an L-shaped raised bed works, where it fits best, and how the build differs from two separate rectangular beds.
- Cedar vs pine for raised beds: Compare cedar and pine for raised garden beds: typical lifespan in soil contact, cost difference, and how pressure treatment changes pine's durability.