# \[NEW] Scoring Calculator
## What is the Tool?
The GRESB Data Center Scoring Calculator is an Excel-based resource designed to help participants better understand the scoring methodology used in the GRESB Data Center Assessment.
The tool mirrors the structure and logic of the GRESB scoring model, allowing participants to explore how different portfolio configurations affect results. It can be used to simulate scoring outcomes, understand maximum achievable scores by indicator, and perform “what-if” analyses to assess the impact of different inputs.
This tool contains:
* **Instructions**: Provides step-by-step guidance on how to use the tool.
* **GRESB Scoring Calculator**: An interactive model that allows users to input data, simulate scoring outcomes, and analyze how different selections and controls affect results.
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This tool is not linked to the GRESB Portal and does not impact your official submission. It may be used freely to test inputs and understand potential scoring outcomes.
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## How to Use the Tool?
To get started, open the “Scoring Calculator” tab and complete the input cells (these are highlighted in grey and marked with a blue arrow).
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### **Define the portfolio breakdown**
Use the dropdown menu in cell **D3** to define the lifecycle breakdown of your portfolio (*following the same structure as indicator RC4*).
* If your portfolio includes both operational and development sites, select "Both" and enter the percentage split in cells **D4** and **D5**.
Once completed, the output cells will automatically update based on your selections. **Column G** will reflect the resulting GRESB Score for each indicator (refer to [Scoring Basics](/data-center-assessment/1.-getting-started/scoring-basics.md#gresb-score) for more details on how this split is applied).
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### **Simulate Control-Weighted Score**
Enter the level of control you have over *Implementation* and *Measurement* indicators in **column H** (grey cells marked with a blue arrow).
Once values are entered, **column I** will automatically update to reflect your Control-Weighted Score. This is calculated by redistributing the weight of indicators where control is below 100% to the corresponding *Strategy* and *Management* indicators within the same module (refer to [Scoring Basics](/data-center-assessment/1.-getting-started/scoring-basics.md#gresb-score) for more details on Control-Weighted Score).
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