How to Measure Your Perfect Door: A Step-by-Step Guide

(So you can purchase a KK smart lock once you’ve chosen your door, of course.)

Choosing a new door for your home can be an exciting project, but it all starts with one critical step: accurate measurements. Without precise dimensions, you may end up with a door that doesn’t fit properly, leading to wasted time, effort, and money. Fortunately, measuring for a door is a straightforward process. With the right tools and a clear understanding of what to measure, you can ensure a perfect fit every time.

Tools You’ll Need

Before you begin, gather the following tools and materials:

• A tape measure (preferably a metal one for accuracy).

• A pencil or marker for taking notes.

• A notepad or smartphone to record your measurements.

• A level (optional but helpful for ensuring straight lines).

Step 1: Measure the Width

Start by measuring the width of the door opening. This measurement is taken from the inside of one side jamb (the vertical frame piece) to the inside of the opposite side jamb. Take three measurements: one at the top, one at the middle, and one at the bottom. The smallest of these three measurements is the width you’ll use. This ensures the door will fit even if the frame isn’t perfectly square.

Step 2: Measure the Height

Next, measure the height of the door opening from the floor (or threshold) to the underside of the top frame (head jamb). As with the width, it’s a good idea to measure in three spots—left, center, and right—and use the shortest measurement. This will account for any unevenness in the floor or frame.

Step 3: Check the Door Thickness

If you’re replacing an existing door, measure its thickness. Standard doors are often 1 3/8 inches or 1 3/4 inches thick. Knowing this dimension ensures you’ll select a door that fits snugly within the existing frame and hardware.

Step 4: Confirm the Swing and Handing

Before ordering your new door, you’ll also need to know its swing direction and handing. Stand inside the room and face the door. If the hinges are on your right and the door swings inward, it’s a right-hand door. If the hinges are on your left and it swings inward, it’s a left-hand door. Understanding this detail ensures you get a door that opens in the correct direction for your space.

Step 5: Double-Check Your Measurements

Once you’ve recorded all your dimensions, double-check each one. A simple mistake in your notes can lead to ordering the wrong size. If possible, have someone else verify your measurements for accuracy.

Step 6: Choose the Right Door Size and Style

With your measurements in hand, you can confidently shop for a door that meets your specifications. If you’re installing a pre-hung door (a door that comes already mounted in its frame), be sure to consider the overall dimensions of the unit, not just the door slab itself. Many retailers provide size charts to help you match your measurements to the correct door style.

Conclusion

Measuring your door may not be the most glamorous part of the process, but it’s undoubtedly the most crucial. Taking accurate measurements ensures your new door will fit perfectly, operate smoothly, and look great in your space. With a tape measure, a bit of patience, and this step-by-step guide, you’ll be well on your way to finding the perfect door for your home.