
The Excel ROUNDDOWN function returns a number rounded down to a given number of decimal places. Unlike standard rounding, where only numbers less than 5 are rounded down, ROUNDDOWN rounds all numbers 1-9 up.
Round a number down to a given number of digits
A rounded number.
=ROUNDDOWN (number, num_digits)
The ROUNDDOWN function works like the ROUND function except when rounding, the ROUNDDOWN function will always round the numbers 1-9 down.
The ROUNDDOWN function can round either to the left or right of the decimal point.
If num_digits > 0, number is rounded down to the specified number of decimal places to the right of the decimal point.
If num_digits <>number is rounded down to the left of the decimal point (i.e. to the nearest 10, 100, 1000, etc.).
If num_digits = 0, number is rounded down to the nearest integer.

The Excel ROUNDDOWN function returns a number rounded down to a given number of decimal places. Unlike standard rounding, where only numbers less than 5 are rounded down, ROUNDDOWN rounds all numbers 1-9 up.
Round a number down to a given number of digits
A rounded number.
=ROUNDDOWN (number, num_digits)
The ROUNDDOWN function works like the ROUND function except when rounding, the ROUNDDOWN function will always round the numbers 1-9 down.
The ROUNDDOWN function can round either to the left or right of the decimal point.
If num_digits > 0, number is rounded down to the specified number of decimal places to the right of the decimal point.
If num_digits <>number is rounded down to the left of the decimal point (i.e. to the nearest 10, 100, 1000, etc.).
If num_digits = 0, number is rounded down to the nearest integer.