## Excel LOG10 Function

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

=LOG10 (number)

#### Arguments

• 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)

#### Examples

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.

Notes:

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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