Excel ROUNDDOWN Formula

Rounds a number toward zero to the specified number of digits after the decimal point.

Syntax

Formula structure

Source: Quadratic docs
=ROUNDDOWN(number, [digits])
number
Required: Yes

Required argument used by the ROUNDDOWN formula.

[digits]
Required: No

Optional argument used by the ROUNDDOWN formula.

Examples for the excel rounddown formula

Copy these examples into a spreadsheet and adjust the ranges for your own data.

ROUNDDOWN syntax pattern

=ROUNDDOWN(number, [digits])

Use this ROUNDDOWN pattern as the starting point for your spreadsheet formula.

ROUNDDOWN in a worksheet

=ROUNDDOWN(A2, [digits])

Rounds a number toward zero to the specified number of digits after the decimal point.

When to use ROUNDDOWN

Use ROUNDDOWN when you need to round a number toward zero to the specified number of digits after the decimal point.

  • Build totals, rounded metrics, and numeric calculations.
  • Clean up numeric inputs before analysis.

How ROUNDDOWN works in Quadratic

In Quadratic, ROUNDDOWN follows the syntax ROUNDDOWN(number, [digits]). The function works inside Quadratic formulas and can be combined with spreadsheet ranges, tables, and other formulas.

Common ROUNDDOWN mistakes

Most ROUNDDOWN issues come from mismatched argument types, ranges that do not cover the intended data, or optional parameters being omitted when the default behavior is not what you expected.

  • Check each required parameter before copying the formula across a sheet.
  • Confirm that ranges line up with the rows or columns you intend to analyze.
  • Use Quadratic AI to explain or debug the formula when the result looks wrong.

Related formulas

ROUNDDOWN formula FAQ

What does the excel rounddown formula do?

ROUNDDOWN rounds a number toward zero to the specified number of digits after the decimal point.

What is the syntax for ROUNDDOWN?

The syntax is ROUNDDOWN(number, [digits]). Required and optional parameters are listed at the top of this guide.

Can Quadratic AI help with ROUNDDOWN?

Yes. Quadratic AI can write a ROUNDDOWN formula, explain existing formula logic, or help debug broken references and unexpected results.

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Spreadsheet formulas are powerful, but they get painful fast. A ROUNDDOWN formula can start simple, then turn into logic that is hard to understand, easy to break, and difficult to share with the rest of your team.

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Why formulas slow teams down

  • Long formulas become hard to read, understand, and trust.
  • Formula logic breaks when rows, columns, or assumptions change.
  • Manual updates make dashboards and reports fragile over time.
  • Complex formulas are difficult to explain, review, and share with teammates.
  • Advanced analysis quickly outgrows formula-only workflows.