This tutorials shows how to Round a number up to next half in Excel.
If you need to round a number up to the next half, you can use the CEILING function, which always rounds up based on a supplied multiple.
Note that MROUND also rounds based on a supplied multiple, but it always rounds to the nearest multiple.
In the example, the formula shown is:
Even though the value in B5 is 1.1, CEILING rounds up to the next multiple of .5, which is 1.5