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How to Use ROUNDDOWN Function in Excel: Always Round Numbers Down

Monday, June 2nd 2025. | Excel

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Learn how to use the ROUNDDOWN function in Excel to round numbers down to a specified number of digits. Perfect guide for beginners and professionals in the USA.

What Is the ROUNDDOWN Function in Excel?

The ROUNDDOWN function in Excel rounds a number down, toward zero, to a specified number of digits. This means it always rounds the number down, regardless of its decimal value.

Formula syntax:

=ROUNDDOWN(number, num_digits)

Understanding the Arguments

number: The number you want to round down.
num_digits: The number of digits to round the number down to. Use 0 to round down to the nearest whole number, positive numbers for decimal places, or negative numbers for digits to the left of the decimal point.

Simple ROUNDDOWN Function Examples

Round down to 2 decimal places: =ROUNDDOWN(3.9876, 2) returns 3.98
Round down to nearest whole number: =ROUNDDOWN(7.9, 0) returns 7
Round down to tens: =ROUNDDOWN(1234, -1) returns 1230

When to Use ROUNDDOWN in the USA

ROUNDDOWN is useful in:

Budgeting and financial planning to avoid overestimations
Inventory control and supply chain management
Engineering and manufacturing for conservative measurements
Educational grading and score calculations

Related Functions

ROUND: Rounds to the nearest number.
ROUNDUP: Always rounds numbers up.
MROUND: Rounds to the nearest multiple.

Tips and Common Mistakes

Always use integer values for num_digits.
Negative num_digits rounds digits to the left of the decimal point.
Remember ROUNDDOWN rounds toward zero, so it truncates decimals.

Conclusion

The ROUNDDOWN function is a valuable tool when you need to consistently round numbers down. Whether for financial data, engineering, or education in the USA, mastering ROUNDDOWN ensures your calculations stay conservative and precise.

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