What is Half of 3 3/8 Inches?

Half of 3 3/8 inches is 1 11/16 inches (1.6875″, 42.86 mm).

How to Calculate It

Convert 3 3/8 to an improper fraction, divide by 2, then simplify. 3 3/8 = 27/8, divided by 2 = 27/16, simplified to 1 11/16.

On the Tape Measure

The mark at 1 11/16 inches (1.6875″) is a standard mark on all tapes.

To find half of any tape measure measurement, enter it in TapeMath and tap the Half It button. The result appears instantly on the visual tape.

Where 3 3/8″ Comes From

3 3/8″ appears in door and window rough opening math when a 3.5″ stud wall has a 1/8″ kerf or shim adjustment removed. Tile installers also encounter it when working with 3″ tile and 3/8″ grout joints laid on a 3 3/8″ module.

When You Need Half of 3 3/8″

1 11/16″ is the center mark for 3 3/8″ stock. Finish carpenters use it to center hardware on a narrow stile, locate the midpoint of a door stop profile, and set the setback for some door hardware installations.

Finding 1 11/16″ on the Tape

1 11/16″ is the second tick past 1 5/8″, or one tick before 1 3/4″. On a tape showing 16ths it is the 27th mark from zero.

Try it — TapeMath fraction calculator