Choosing the right barn door size is where a lot of projects go sideways. If the door is too narrow, you end up with awkward gaps and poor coverage. On the other hand, if it is too tall or too wide, the installation gets harder fast.
This barn door size chart tool helps you figure out the exact door measurements based on your opening width, opening height, and how much overlap you want on each side. It is a quick way to size a barn door more confidently before you buy hardware, order a slab, or start building your own.
Barn Door Size Chart Tool
Enter your opening size and preferred overlap to get exact barn door width, height, and recommended track length.
Your Measurements
Measure the finished wall opening from side to side.
Measure from the floor to the top of the finished opening.
A common choice is 1.5 to 2 inches on each side.
Most people use about 1 inch of top overlap.
Typical finished floor clearance is about 0.375 to 0.75 inches.
Your Recommended Size
Recommended Door Width
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Recommended Door Height
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Recommended Track Length
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Measurement
Result
Opening Width
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Opening Height
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Total Width Overlap
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Top Overlap
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Bottom Gap
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Visual Size Guide
Enter your measurements and click Calculate Size to see your recommended barn door dimensions.
This tool gives a practical sizing estimate for standard sliding barn doors. Always double-check hardware requirements, wall clearance, trim thickness, and floor guide placement before ordering.