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Window and Door Rough Opening / Frame Size Calculator
Ordering windows and doors is easy when your measurements are right. Our Window & Door Rough Opening / Frame Size Calculator takes the guesswork out of sizing so you can get a perfect fit every time.
Whether you’re replacing old windows or installing new doors, the calculator helps you convert rough opening measurements into the exact frame size you need or calculate the rough opening required for installation based on frame size.
Rough Opening Calculator
Frame to RO
RO to Frame
Feet & Inches
Millimeters
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