Sizing Calculator
Enter known dimensions into the sizing calculator below to calculate additional dimensions including unit size, rough opening, casing size and masonry opening. Shim space and sealant gap can be set to your project's requirements. The calculator can also account for any profiled casing size.
 
 

Instructions:
Choose your known dimension and then enter the width and height. (Dimensions must be entered as inches in decimal form. Use the fraction conversion chart as a reference.) Change the shim space and sealant gap dimensions if different than .25 inches. If adding a profiled casing, select your casing style. When complete, select “Calculate”.
 


Calculate using known  
Width (in inches):
 Fraction chart
Height (in inches): 
 
Shim Space (in inches):
 
Sealant Gap (in inches):
 
Profiled Casing:    Show me casing profiles
Casing Size:
 
Sill Nosing:  
Sill Nosing Size:
 
 

 
Input fields have been changed, please recalculate
   Width Height
 Overall Unit Size
 Rough Opening
 Casing Dimension 
 Masonry Opening 

Due to various building materials (house wraps, sill flashing, etc.), please be mindful to leave enough shim space and sealant gap to account for these materials.