Floor and Ceiling Functions

While the ROUNDUP (round up to the nearest number, specifying the number of digits), ROUNDDOWN (round down to the nearest number, specifying the number of digits), and ROUND (round to nearest number up or down, specifying the number of digits) are very helpful, sometimes you wish to round up or down to a specific multiple.  Maybe you are dealing with large numbers and want to deal work only with multiples of 1,000 or 10,000.  Or maybe you’re building a graph or chart and want to minimize the scale.  The best way to do that, you decide, is to make the base (lower bound value) lower than, but as close to, the lowest number as possible.

No matter the reason, performing this is easy.  For each of them, you only need the number you are rounding and the multiple you’d like to round (up or down) to.  Examples follow:

Value: A1=1,798

Floor(A1,5)=1,795
Floor(A1,10)=1,790
Floor(A1,25)=1,775
Floor(A1,100)=1,700
Floor(A1,1,000)=1,000
Floor(A1,1,500)=1,500
Floor(A1,2,000)=0

Ceiling(A1,5)=1,800
Ceiling(A1,10)=1,800
Ceiling(A1,25)=1,800
Ceiling(A1,100)=1,800
Ceiling(A1,1,000)=2,000
Ceiling(A1,1,500)=3,000
Floor(A1,2,000)=0

As always, if you have questions, drop me a line or post a comment.