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Excel LOG10 Function

The LOG10 function returns the base-10 logarithm of a given number.

log10 function 1


=LOG10 (number)


  • Number (required): The positive number that you want to calculate the base-10 logarithm of.

Return value

The LOG10 function returns a numeric value.

Function notes

  1. Number, the only argument in the LOG10 function, should be supplied as a numeric value.
  2. LOG10 function will return the #VALUE! error if number is non-numeric.
  3. LOG function will return the #NUM! error if number ≤ 0.
  4. In LOG function, when the base argument is omitted, it defaults to 10. In this situation, LOG10(number) is equal to LOG(number). For example,

    =LOG10 (100) equals to =LOG (100)


Supposing, you want to calculate the base-10 logarithms of the given numbers in the table below. Please do as follows.

1. Copy the formula below into cell C4.

=LOG10 (B4)

2. Then drag the fill handle down to the cells you want to apply this formula too. The results are as the following screenshot shows.

log10 function 2


We can directly input value in the number argument in the formula. For example, the formula in cell C4 can be changed to:

=LOG10 (0.1)

Relative Functions:

  • Excel EVEN Function
    The EVEN function rounds numbers away from zero to the nearest even integer.

  • Excel EXP Function
    The EXP function returns the result of the constant e raised to the nth power.

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