Overview
What Is a Rough Opening Calculator?
This tool calculates the rough opening size needed in framing for a door or window, based on the finished unit size plus standard clearance.
Calculate rough opening size for installation.
This tool calculates the rough opening size needed in framing for a door or window, based on the finished unit size plus standard clearance.
Useful for planning door and window framing during construction or renovation.
Input the actual door/window unit dimensions.
The result adds standard clearance and updates automatically.
The framed opening in a wall, slightly larger than the actual door/window unit, allowing room for installation and adjustment.
This varies by manufacturer, but commonly about 1/2 to 1 inch larger than the unit on each dimension - always check specific product instructions.
To allow room for shimming, leveling, and squaring the unit during installation.
Yes, the same general clearance principle applies to both, though check specific product requirements.
No, calculations happen entirely in your browser.
Yes, this provides a general estimate - always verify with your specific door/window manufacturer's installation instructions for precision.
No, this calculates the basic framing rough opening - exterior finish materials may need additional consideration.
For structural framing work, especially load-bearing walls, professional consultation is often recommended.
Clearance principles are similar, though specific requirements can vary by door type and manufacturer.
Yes, completely free with no sign-up required.