Half of 24 5/8 inches is 12 5/16 inches (12.3125″, 312.74 mm).
How to Calculate It
Convert 24 5/8 to an improper fraction, divide by 2, then simplify. 24 5/8 = 197/8, divided by 2 = 197/16, simplified to 12 5/16.
On the Tape Measure
The mark at 12 5/16 inches (12.3125″) 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.