One way:

=CEILING(A1,"0:5:0")

In article ,
Najeeb wrote:

I have a clumn of times. How do I round them up to the nearest multiple of 5
minutes? I know of ROUNDUP.. but how do I do it with times?

Eg.
5:03
5:05
5:06
5:08
5:09
5:09
5:09

goes to:

5:05
5:05
5:10
5:10
5:10
5:10
5:10