How to Determine the Height of an Arch on an Entry Door

The arch is an architectural design that involves a curved area that spans an open space and supports weight. This design dates back thousands of years. Arched doors provide a smooth, eye-pleasing alternative to a standard rectangular door. If you have an arched entry door, you may need to measure it if you plan to install or replace the door. Determining the height of an arch on an empty doorway involves a few basic measurements.

Things You'll Need

• Tape measure

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Instructions

1. • 1

     Measure from the bottom of the doorway to the point at which the arch begins. This will be measurement "A."

   • 2

     Measure from the bottom of the doorway to the top point of the arch. This will be measurement "B."

   • 3

     Subtract measurement "A" from measurement "B" if you want to determine the height of the arched portion of the doorway by itself.