Door Measurement Guide
Getting accurate measurements is crucial for a perfect door fit. Follow this step-by-step guide to measure your door opening correctly, or let our professionals do it for you.
Tools You'll Need
Important: Measure the Opening, Not the Door
Always measure the rough opening (the framed hole in the wall), not the existing door or door frame. If replacing an existing door, you may need to remove trim to access the rough opening. Take all measurements in inches and record the smallest measurement if they vary.
Step-by-Step Measurement Guide
Follow these steps carefully for accurate measurements that ensure a perfect fit.
Measure the Width
Measure the horizontal distance of the door opening from the inside of one side jamb to the inside of the other. Take measurements at three points: top, middle, and bottom of the opening.
Pro Tips
- Record the smallest of the three measurements
- Standard interior doors are 24", 28", 30", 32", or 36" wide
- Exterior doors are typically 36" wide
Measure the Height
Measure the vertical distance from the floor (or threshold) to the top of the door opening. Take measurements on both the left side and the right side of the opening.
Pro Tips
- Record the smallest of the two measurements
- Standard door height is 80" (6'8")
- Measure from finished floor level
Measure the Wall Depth
Measure the thickness of the wall from one surface to the other. This is also called the "jamb depth" and determines the door frame size needed. Include any drywall or finishing materials in this measurement.
Pro Tips
- Standard interior walls are 4-1/2" to 4-9/16" thick
- Exterior walls are typically 6-9/16" thick
- Measure at several points for accuracy
Check if Opening is Square
Measure diagonally from corner to corner in both directions. If the two diagonal measurements are equal (or within 1/4"), the opening is square. If not, note the difference as this may require adjustments.
Pro Tips
- Use a level to check if sides are plumb
- Out-of-square openings may need shimming
- Note any issues for installer
Record Your Measurements
Write down your measurements and keep them handy when ordering. Take photos of the opening from multiple angles to share with our team if needed.
Door Types & Standard Sizes
Single Entry Door
Classic single door for main or side entries. Available in various styles and materials.
32" x 80" or 36" x 80"
Double Entry Door
Grand double doors for impressive entrances. Requires wider opening.
60" x 80" or 72" x 80"
Door with Sidelite
Entry door with one or two glass sidelites for added light and elegance.
48" x 80" to 60" x 80"
Do's and Don'ts
Do: Measure Multiple Times
Always take each measurement at least twice to ensure accuracy. Compare readings and use the smallest measurement.
Don't: Measure the Existing Door
Never measure the door itself. The rough opening is what matters for ordering the correct size.
Do: Take Photos
Photograph the opening from multiple angles. This helps our team identify any potential issues.
Don't: Round Up Measurements
Always record exact measurements. Rounding can result in a door that doesn't fit properly.
Do: Check Floor Level
Use a level to check if the floor is even. Uneven floors may require threshold adjustments.
Don't: Forget Wall Depth
Skipping the wall thickness measurement can result in a jamb that's too narrow or too wide.
Need Help With Measurements?
Not sure about your measurements? Our professionals can visit your home and take precise measurements for free. No obligation, just expert assistance.