Wainscoting Calculator – Super Simple

Here’s A Simple Wainscoting Calculator

To use the Wainscoting calculator, change the numbers below to reflect what you have in your wainscoting project.

I put the Wainscoting calculator up on the top of the page to make it easier to find. The last thing you need is having to go hunting for the calculator on this page when all you want to do is figure out your wainscoting frame width. 🙂

I made the wainscoting wall calculator because I remember searching a loooong time for something similar to it when I started my wainscoting project.

I think the math behind a DIY wainscoting project is the biggest road block for wainscoting, this will hopefully remove a lot of that. 🙂

How to measure for wainscoting and how do you figure out the wainscoting measurements are probably the two biggest questions that came to my mind initially… and I’m sure that I’m not alone (I hope so anyways 😄).

What Makes This Wainscoting Calculator Different?

Using It as a Picture Frame Molding Calculator

Good news: this doubles as a picture frame molding calculator. “Picture frame wainscoting” and “picture frame molding” (also spelled picture frame moulding) describe the same thing, the boxes of trim you build on the wall below the chair rail. The math for the box widths is identical, so you can use this exact tool as your picture frame moulding calculator. Just enter your wall width and the number of frames you want, and it returns each frame width in real tape-measure fractions.

Whether you call it wainscoting, box molding, or picture frame molding, the calculator handles the spacing and frame sizing for you so every box on the wall comes out even.

Building in centimetres or millimetres? Use the metric wainscoting calculator instead.

Wainscoting Planner: Lay Out Your Wall in 5 Steps

Think of the calculator above as a simple wainscoting planner. It answers the one question that changes on every wall: how wide should each frame be? The chair rail height and the spacing stay the same all the way around the room, so once you know the frame width for a wall you can mark it out and start building.

1. Measure your wall width. Measure the full width of the wall in inches, end to end. The calculator starts with the 124 1/2 inch wall from my own project, so replace it with your number.
2. Choose the spacing between frames. Pick the gap you want between each frame and at both ends. This gap is called the stile. I used 3 1/2 inches because that is the width of a 2×4, which made spacers easy to cut.
3. Try a number of frames. Type in how many frames you think will fit. The calculator instantly shows how wide each frame will be, in tape measure fractions.
4. Adjust until the boxes look right. Try one more frame and one less. I like boxes that come out close to a rectangle, so I pick the count that looks best on the wall.
5. Mark the wall and build. Use the same frame width and stile for every box on that wall. Click Show details if you want to see the math, then follow the DIY wainscoting series to cut and install.

It’s A Simple Wainscoting Calculator

I’ve seen other picture frame wainscoting calculators out there but they all seem crazy confusing and complicated. I think a lot of them focus on the layout. Many of them even show you a visual of what it would look like… but all the ones I found were so confusing – I ended up using a pen and paper!

This wainscoting wall calculator was created to help with the picture frame molding measurements that change with every wall you do. The height and spacing from the chair molding to your picture frames will be the same throughout your project, but the width of each picture frame molding will change with each wall width.

When you need to calculate the wainscoting frame widths for a new wall – this is the picture frame wainscoting calculator you should use. 🙂

It Uses Tape Measure Fractions

The results from this calculator are in fractions that you can use on your tape measure. The conversion from decimal to simple tape measure fractions is THE MAIN REASON I did that because when I was doing my wainscoting, I spent a whole lotta time figuring out the frame dimensions, and then my answer was in decimal.

Then I spent almost the same amount of time trying to convert the decimal amount to a fraction that I could then use on a tape measure.

It would take me a little time to figure out 16.6 is 16 11/16!  LOL This tool replaces all that crazy math. 🙂

My goal with the wainscoting calculator was simple. Give it the numbers you have from your tape measure and it gives you back numbers you can use on your tape measure (did I mention that you can use the results on a tape measure!).

If you’re interested in how the picture frame wainscoting calculator figures out the numbers, here’s a brief breakdown of how I calculated my wainscoting frames using pen and paper during my project.

How To Measure For Wainscoting Width

If you want more info about my wainscoting project check out these posts:

DIY Wainscoting – Part 1 – Design And Layout

DIY Wainscoting – Part 2 – Cutting The Frames

DIY Wainscoting – Part 3 – Installing The Molding

Wainscoting Calculator FAQ

How do you calculate wainscoting frame width?

Subtract the spacing from the wall width, divide by the number of frames, then subtract the spacing again. For a 124 1/2 inch wall with 6 frames and 3 1/2 inch spacing, that is (124.5 – 3.5) / 6 – 3.5, or about 16.7 inches per frame. The calculator does this for you.

How many picture frames should I put on my wall?

There is no single right number. Try your best guess, then one more and one less, and pick the count that makes the boxes look closest to a rectangle. The calculator updates the frame width as you change the number.

How far apart should wainscoting frames be?

I used 3 1/2 inches between frames because it looked good and matches the width of a 2×4, so spacers were easy to make. That space between frames is called the stile. Use whatever spacing looks right on your wall and enter it in the calculator.

Can I use this as a picture frame molding calculator?

Yes. Picture frame molding, box molding, and picture frame wainscoting all describe the same boxes of trim on the wall, and the width math is identical. Enter your wall width, spacing, and number of frames to get each frame width.

Is there a metric version of this wainscoting planner?

Yes. If you measure in centimetres or millimetres, use the metric wainscoting calculator, which gives you results in metric with no conversion.

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