Excel often requires you to round numbers, but sometimes rounding normally isn’t enough. In many real-world situations, you need to round numbers up, no matter what the last digit is.
That’s exactly what the ROUNDUP function does.
Instead of rounding according to standard rules, ROUNDUP always rounds up, making it especially useful when estimating costs, calculating required inventory, or ensuring that enough materials are ordered.
In this guide, you’ll learn:
- What the ROUNDUP function does
- How ROUNDUP differs from ROUND
- The syntax of the ROUNDUP function
- How to round numbers up to decimals
- How to round numbers up to whole numbers
- How to round numbers up to tens, hundreds, or thousands
- Real-world examples of when ROUNDUP is useful
What Does the ROUNDUP Function Do?
The ROUNDUP function rounds a number away from zero, regardless of the digits being removed.
This means:
- 4.21 rounded up to one decimal becomes 4.3
- 7.01 rounded up to zero decimals becomes 8
- 125 rounded up to the nearest hundred becomes 200
Unlike standard rounding, ROUNDUP ignores typical rounding rules and always increases the value.
ROUNDUP Function Syntax
The ROUNDUP function uses two arguments:
=ROUNDUP(number, num_digits)
Argument Breakdown
number
The value you want to round up.
num_digits
The number of digits you want to round to.
- Positive number → rounds to decimal places
- Zero → rounds to whole number
- Negative number → rounds to tens, hundreds, etc.
Example Dataset Used in This Tutorial
You can download the sample data we’ll be using in this tutorial by clicking on this link—> ROUNDUP Function Data
Basic ROUNDUP Example
Let’s start with a simple example, rounding a decimal number upward.
Suppose you have a value of 12.341 and want to round it up to two decimal places.
=ROUNDUP(A2,2)
This returns12.35
Even though the third decimal is 1, Excel still rounds up.
Rounding Up to Whole Numbers
If you set num_digits to 0, Excel rounds the number up to the nearest whole number.
Example:
=ROUNDUP(A2,0)
If A2 contains 7.01
The result will be 8
Even a very small decimal forces the number upward.
Rounding Up to Tens, Hundreds, or Thousands
Using negative numbers for num_digits lets you round to larger place values.
| num_digits | Rounds To |
|---|---|
| -1 | Tens |
| -2 | Hundreds |
| -3 | Thousands |
Example:
=ROUNDUP(A2,-2)
If A2 contains 125
Result: 200
Even though 125 would normally round to 100, ROUNDUP forces it upward.
ROUNDUP vs ROUND: What’s the Difference?
This is where many Excel users get confused.
| Value | ROUND | ROUNDUP |
|---|---|---|
| 4.21 (1 decimal) | 4.2 | 4.3 |
| 4.25 (1 decimal) | 4.3 | 4.3 |
| 4.29 (1 decimal) | 4.3 | 4.3 |
ROUND follows rounding rules.
ROUNDUP always rounds upward.
ROUNDUP ensures your result is never smaller than the original number.
When Should You Use ROUNDUP?
ROUNDUP is especially useful when underestimating would cause problems.
Common real-world uses include:
- Ordering materials (always round quantities up)
- Estimating project costs
- Determining number of boxes needed
- Calculating required staffing
- Ensuring sufficient inventory
Common ROUNDUP Mistakes
Even though ROUNDUP is simple, a few mistakes happen frequently.
Using ROUND Instead of ROUNDUP
If you use ROUND when you really need ROUNDUP, your result may be too small, which can cause shortages.
Always ask:
Do I need to guarantee enough?
If yes, use ROUNDUP.
Using the Wrong num_digits Value
Many users accidentally use:
=ROUNDUP(A2,2)
When they meant:
=ROUNDUP(A2,-2)
Remember:
- Positive → decimals
- Negative → tens/hundreds/thousands
Example Dataset Used in This Tutorial
You can download the sample data we’ll be using in this tutorial by clicking on this link—> ROUNDUP Function Data
