How To Calculate Door Jamb Size
Tip write down exact measurements but when determining door and door frame size you may want to take off 1 2 or so from the height and width.
How to calculate door jamb size. Enter the jamb over all size in the jamb od text box select the call size of the door from the drop down list check the second radio button calculate with jamb over all and door call size then click calculate button. Gauge the hinge size typically either 3 1 2 4 or 4 1 2 inches as measured including the overall size of both hinges. You will need to measure this on the outside and the inside and they may be different. These doors are sold according to standard measurements which are 30 inches wide by 80 inches tall.
These numbers should be close to the same but it can be helpful to know both of them. Determine the distance from the top of the door to the top of each hinge. Estimated distance from finished floor to the bottom of the door edge i e. Typical door jamb sizes are.
To measure the door jamb size you may need to remove any trim moulding or siding you have on the door. Measure from the door frame to where the drywall starts this is your casing the measurement of the size trim you will put around the door. Trim around a jamb is typically referred to as door casing. 4 9 16 for 2x4 frame with drywall.
Pre manufactured doors include the casing two jambs and a header plus the door and the hinges. If you do not remove the trim measure from the inside edges of the trim or moulding make sure you are measuring from the visible edges of the jamb to get the correct size. Recommended distance from door top edge to header bottom 6 final door height distance from floor to header bottom 6 1 4 in other. Standard door casing is typically 2 1 4 inch wide and about 5 8 inch thick.
The most common thickness is 1 75 inches 4 4 cm. We have created this video series to help educate our customers on all they need to know about purchasing a door online and everything that makes up a door. Hold a tape measure to the edge of the door and record its thickness.