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More Control Over Rounding with FLOOR() and CEILING()

ROUNDUP() and ROUNDDOWN() let you control the direction of rounding, but not the multiple. What do I mean by multiple? An example will help explain. Suppose you’re working with financial figures and don’t need the precise value, but rather the value to the nearest $100. In this case, 100 is the multiple.

You can use the FLOOR() and CEILING() functions for this purpose; FLOOR() rounds down and CEILING() rounds up. Each function takes two arguments: the value and the multiple. Here are some examples:

  • =CEILING(1249, 125) evaluates to 1250.
  • =FLOOR(1249, 125) evaluates to 1125.
  • =CEILING(1249, 250) evaluates to 1250.
  • =FLOOR(1249, 250) evaluates to 1000.

Strangely, you cannot use a negative value with a positive multiple. For example, =CEILING(-1249, 125) returns the #NUM! error. You must specify a negative multiple in cases like this. With negative values, these two functions are similar to ROUNDUP() and ROUNDDOWN in that CEILING rounds away from zero and FLOOR() rounds toward zero.

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