Looker Studio Function : Round
Category: Arithmetic function
The ROUND() function in Looker Studio is a powerful tool used to simplify numeric data by reducing decimal points to a specified number. It helps in creating cleaner visualizations and ensuring consistency in reporting, especially for data distribution, customer segmentation, and decision-making.
Purpose of the Round Function
1. Data Distribution Analysis :
The ROUND function helps normalize and clean data for distribution analysis, making it easier to visualize trends across value ranges. Rounded values group similar data points, improving accuracy in charts and histograms.
2. Customer Segmentation :
When segmenting customers by spending, age, or engagement metrics, ROUND helps standardize data into meaningful groups. This simplifies analysis and makes it easier to compare segments based on rounded averages or totals.
3. Decision Making :
Rounded figures support clear communication during business decision-making. Stakeholders can understand KPIs without being distracted by insignificant decimal points, ensuring quick and informed decisions based on approximate values.
Type of Calculation:
| Use Case | Description |
|---|---|
| Performance Benchmark | Round off performance metrics like conversion rates to identify thresholds. |
| Customer Segmentation | Create buckets for revenue, age, or scores by rounding values. |
| Time Series Analysis | Simplify trend lines by rounding off periodic metrics (weekly, monthly).. |
ROUND(number, decimal_places)
| Parameter | Type | Description |
|---|---|---|
number | Number | The numeric value to be rounded |
decimal_places | Number | Number of decimal places to round the value to |
How Does the Round Function Work?
The ROUND function in Looker Studio executes a mathematical operation that rounds numeric values either up or down based on standard rounding rules. It processes the input number and trims or adds digits to match the specified decimal places.
When Should You Use Round Function?
You want simplified, readable values in dashboards
Grouping data into broader categories (e.g., age 25, 30, 35)
Reporting metrics to stakeholders
Avoiding noise from insignificant decimal values
Example of Round with Result
Example 1: Basic Usage
ROUND(99.875, 1) → 99.9
Example 2: Column Usage
Apply ROUND directly in calculated fields or custom metrics in Looker Studio charts and tables.
Example 3: Handling Decimals and Scientific Notation
Looker Studio can handle inputs like 1.23E+3 and round them as needed:
ROUND(1.23E+3, 0) → 1230
Example 4: Combining with Other Functions
ROUND(AVG(Sales), 2)
ROUND(SUM(Revenue) / COUNT(User_ID), 0)
Tips and Tricks
Use negative decimal places to round to tens or hundreds:
ROUND(456, -1)→ 460Pair with aggregation functions for clean KPIs
Use with conditional statements for smart segmentation
Round before filtering to ensure consistent groupings
Looker Studio defaults to zero and rounds to the nearest whole number.
Yes, use negative decimal places: ROUND(235, -1) → 240.
No, it only affects how data is displayed in visualizations or calculated fields.
Absolutely. It works well in calculated metrics and dimensions.
No. ROUND uses standard rounding rules, while FLOOR always rounds down and CEIL rounds up.