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Round a number down

We use the ROUNDDOWN function to round a number down, not minding the number being rounded to a specified number of decimal places. We will walk through the process of using the ROUNDDOWN function in simple steps.

Figure 1- Results of using the ROUNDDOWN function

General Formula


  • “Number” – number to round down
  • “num_digits – the number of decimal places to round down the number.



Setting up the data

  • We will input the numbers to be rounded up in the range: B4:B10
  • Next, we specify the number of digits in the range C4:C10
  • We will place the results in Column D, which we name “Results.”

Figure 2 – Setting up the Data

Applying the Excel ROUNDDOWN function

  • We will click on Cell D4
  • We will insert the formula below in Cell D4


Figure 3 – Applying the ROUNDDOWN function

  • We will press the enter key

Figure 4- Cell containing a rounded down number

  • We will use the fill handle tool to copy the formula into the other cells to get the results.

Figure 5-How to use the Excel ROUNDDOWN function


The ROUNDDOWN function will always round numbers 1-9 down. This is unlike the standard rounding that rounds numbers less than 5 down. It works like the Excel ROUND function and positive digits will be rounded to the right of the decimal point while zero and negative numbers will be rounded to the left.


  • If num_digits is > 0, the number will be rounded to the right of the decimal point
  • If num_digits is < 0, the number is rounded down to the left of the decimal.
  • If num_digits = 0, the number is rounded down to the left of the decimal point

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I need a formula to round up or round down a sheet with multiple cells containing whole numbers to be rounded to either 5 or 0
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