Accent wall calculator — even or different-size boxes, drawn to scale.

A free accent wall calculator that draws the plan and cuts the list

Accent Wall Planner is a free accent wall calculator for the four trim styles people actually build: picture frame molding, board and batten, wainscoting and slat walls. Describe the wall, say how you want it divided, and it solves the geometry, draws the result at true proportions, and hands back an exact cut list. There is nothing to install and no account to make — it is a web app that runs entirely in your browser, so nothing you type is sent anywhere.

Most calculators in this category return numbers and stop. You get a panel width and are left to imagine the wall. This one redraws live as you type, which matters more than it sounds: spacing that reads fine as “14.5 inches” can look wrong on an actual wall, and the only reliable way to catch that is to see it. Every layout is drawn to scale, with optional dimension lines on the drawing itself, so the plan on screen is the wall you will end up with.

The bigger difference is that boxes do not have to match. Nearly every board and batten calculator and wainscoting calculator online assumes one repeated size, because an even grid is the easy case to solve. Real accent walls are rarely even — a wide center panel between narrower flanks, or a taller top row, is what makes a wall look designed rather than tiled. This planner treats different-size boxes as the normal case, with Even, Center and Ends presets to start from, and lets you set each column and row individually from there.

Work in whatever your tape reads. Measurements are in inches by default, including fractions — the cut list says 22 3/4 in, not 22.75, because that is what you set a saw to. Switch the Units control for feet-and-inches or metric and the drawing and cut list follow. Enter a wall in inches, set your margins and gaps, and the solved spacing comes back the same way.

The cut list is the part that saves the afternoon. It gives every piece as a long-point miter length with quantities, identical cuts merged, sorted longest first so you get the most out of each board. The accent wall cost calculator goes a step further and packs those pieces onto real stock lengths to tell you how many boards to buy — which is not the same as dividing total footage by board length, because offcuts are scrap. Download the plan as a PNG or print it and take it to the saw.

It also tells you when something will not fit. Ask for more battens than the wall holds and it says so in inches, and names the number that does fit, instead of silently clipping the drawing or returning a layout of zero-width pieces. That honesty is the point: a plan you cannot trust is worse than no plan, because you find out at the saw.

All four styles run on one solver, so switching between them keeps your wall dimensions and just re-divides the space — worth doing before you commit, because the same wall can suit a grid of boxes or a run of vertical battens and it is hard to predict which until you see both. If you are after the squared-up grid look, set your board and batten spacing first, then add rails until the bands are about as tall as the gaps and the openings square themselves up. Start anywhere above — the planner opens on a wide-center layout so you can see what different-size boxes look like — and read how it works if you want the miter math behind the numbers.

How to plan an accent wall

A good accent wall is mostly planning. Before any lumber is cut, three numbers decide how it looks: the size of the wall, how many pieces divide it, and the spacing between them. Get those right on screen — at true proportions — and the cutting is the easy part.

Start by measuring the wall width at a few heights and the height at a few points; walls are rarely perfectly square, so plan to the smallest reading rather than the largest. Decide where the layout should stop — the whole wall, or the area above a baseboard or below a chair rail — and set your margin to the bare reveal you want around the outside. Then choose how the space is divided: a tidy even grid, or, more often, a mix of sizes. Working in metric or reading your tape in feet and inches? Switch the Units control above; the plan and the cut list follow.

That mix is where most calculators fall short. Identical boxes edge to edge can look like a spreadsheet; an accent wall with different-size boxes — a wider center panel with narrower flanks, or a taller upper row — gives the wall a focal point and reads as intentional. This planner treats different-size pieces as the normal case, draws the result live, and keeps the spacing honest: if a layout will not fit, it says so in inches instead of quietly clipping. For the uniform styles the equivalent decision is board and batten spacing, where you pick the batten count and let the gaps be solved.

When it looks right, read the cut list and work longest piece first to get the most from each board — or let the accent wall cost calculator pack the pieces onto boards for you and tell you how many to buy. For the math behind the miter lengths, see how it works.