Measure for Prehung Interior & Exterior Doors
Use Nick's printable forms, diagrams, and installation videos to help confirm rough openings, masonry openings, and replacement door measurements before ordering.
Door Measuring Diagrams
Click any image to view the larger diagram. These visuals can help clarify rough openings, masonry openings, and door components.
Door Size Calculator
Select your door setup to calculate the Unit Size, Rough Opening, Brickmold Size, and Masonry Opening. Results update automatically as you make changes.
Build the Opening Visually
Use this tool as a guide before filling out the measuring form or calling Nick's for help with your project.
Choose Your Door Configuration
Your Calculated Sizes
Overall outside dimension of the prehung door unit.
Framed opening size with room for shimming and adjustment.
Approximate outside dimension including brickmold trim.
Important when brick, stone, stucco, siding, or trim surrounds the door.
Calculator results are based on Nick's standard prehung door sizing rules. Custom units, special jambs, installation conditions, or field conditions may vary. Always confirm final sizing before ordering.
Still not sure?
Send photos of the existing opening along with your measurements and a Nick's door specialist can help review the details.
Send Photos / MeasurementsReady to Record Your Measurements?
Skip the printable forms. Complete your Door Schedule online from your phone, tablet, or desktop, then email it directly to your Nick's Door Specialist.
Interactive Door Schedule
Our online Door Schedule walks you through the same information our sales team uses to prepare your quote.
- ✔ Single & Double Doors
- ✔ Swing Direction
- ✔ Jamb Information
- ✔ Door Sizes
- ✔ Hardware Options
- ✔ Project Notes
- ✔ Mobile Friendly
- ✔ Email Directly to Nick's
Measuring and Installation Videos
Review the videos below before measuring or installing your door. These are especially helpful for confirming proper installation technique.
How to Measure and Install
Overview video for understanding the measuring and installation process.
Installing an Exterior Door
Installation video for exterior door projects and replacement entry doors.
Important: Confirm the Rough Opening and Masonry Opening
It is vital to get the rough opening measurement correct. You typically need approximately 1" of play and shim room when installing a prehung door. When measuring for a replacement door, also get the masonry opening measurement if there is existing brick, stone, stucco, wood siding, or vinyl siding around the entry door, because the surrounding material can affect proper fitment and installation.
Helpful Buying Resource
Not Sure What Size Door You Need?
Download our free Door Size Guide with standard door sizes, rough opening dimensions, and measuring tips used by homeowners, builders, and contractors.
Parts, Door Sweeps, and Installer Resources
Need parts, installation help, or finishing guidance? Use these resources to continue planning your project.
Installing a Door Sweep
Review finishing and maintenance tips, including door sweep installation guidance.
View Door TipsFind a Door Installer
Looking for project help? Visit the installer resource page for preferred installers and trade partners.
Find an InstallerNot Sure Which Measurement Matters?
Start with the printable forms, then compare your opening to the diagrams and videos before finalizing your order details.
