Rounding a number to the nearest 1/3

[rbyrd023]

Hello,
I was wondering if someone could PLEASE HELP me with this problem I am having. I want to take a number in a certain cell and have that number rounded up to the nearest 1/3. EX

Cell A1 comes to 25.06 I want to take that number to an order form that I have and it round up to 25.33

OR

42.72 Rounded up to 43 (42.99)
and so on.

Another thing to add to the frustration is that I want to do it with no VBA?
Is this even possible?
I am counting on all you geniuses to help me through this!

Thank you!

[NBVC]

Try:

=ceiling(a1,1/3)