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How to Compare Bill of Materials in Excel

A bill of materials (BOM) contains the detailed description of all components and sub-assemblies required to assemble into the final product. It also serves as the primary source of data for model meshing, assembly, property assignments, and FE analysis.

For many small businesses, managing product BOMs in Excel can be a time-consuming process.

BOM Templates

BOM templates are pre-designed forms or spreadsheets that serve as a framework for listing and organizing the components, materials, and resources needed to manufacture or assemble a product. They also provide a standardized format for recording detailed information about each item, including quantity, specifications, and sourcing details. Using a BOM template can help reduce costs and improve the efficiency of production processes.

A well-designed BOM template can help you track inventory levels and ensure that the proper quantities of each component are ordered. This can save you money by ensuring that you do not order too much or too little and by helping you avoid excess storage and handling costs. In addition, a BOM can help you keep track of the cost of each component and make better purchasing decisions in the future.

The BOM template can include a list of parts and their respective descriptions and quantities, along with their unit costs. This can be especially useful for companies that have multiple suppliers or vendors for a single project. This can prevent miscommunication and inaccuracies that can lead to expensive mistakes.

A BOM template can be used by different stakeholders, such as departmental managers and project owners. It can also be helpful for identifying the costs of raw materials and predicting how much a project will cost to produce.

Parts Lists

A bill of materials (BOM) is a list of all the items, components and sub-assemblies that are required to create an end product. It provides a summary of the quantity and total cost of the item or assemblage, which can then be used to tally up the final price of the assembled product. The BOM can also provide procurement details of how the items will be obtained, whether by direct purchase from suppliers or through assembly work done in-house.

Sierra Circuits’ online compare bom tool is easy to use. When you upload two different bills of material into the tool, it automatically compares them to highlight the differences. The BOMs are displayed in columns and the union of the part numbers for each component is listed in each column, with newly added or edited parts highlighted in green and deleted ones marked in red.

To compare two BOMs, select the one that you want to edit from the left and then click on the BOM comparison button. A new sheet will appear with the results of the comparison. The data can be viewed and saved as a CSV file. Linked supplier data can be included in the comparison as well, such as pricing, stock information and lead times from manufacturers. You can enable this feature by selecting the options in the Sources area of the Columns tab.

Variable & Fixed Expenses

A BOM is much more than just a list of parts, it also helps with inventory management. Having the right quantities of components and materials in stock can save production delays and extra warehousing costs. It can also help companies cut down on waste by identifying components that aren’t used in the final product.

When it comes to determining business costs, it’s essential to understand the difference between variable and fixed expenses. Variable expenses increase with a company’s output, while fixed costs remain the same no matter how much production is made (for example, rent or employee salaries). Understanding these two types of costs can help businesses make smarter decisions and ensure they are meeting their financial goals.

The BOM Comparison tool, available on the QA/Model Utility menu, reads a bill of materials file and provides an interface to manipulate data in it, such as model meshing, property assignments, and compare between design iterations. This tool supports the Microsoft Excel file format, as well as XML and CSV formats.

The comparison process uses item numbers to identify items in different BOM lists. The program checks for each item number in the newer list and compares it against the older list to see if any of the elements have been added, modified or deleted. This process is fully automated, making the comparison as quick and easy as possible.


A bill of materials (BOM) is a list that shows the parts and sub-assemblies required to assemble and create a product. It is a critical document that helps in production planning, inventory control and manufacturing estimates. BOMs also help avoid production delays and waste.

A BOM template is a critical tool for anyone involved in the creation of physical products, whether it be engineering or manufacturing projects, software development or intangible creative products such as written work and graphic design. This free bill of materials template is a useful tool for tracking the components, materials and sub-assemblies needed to build a finished product.

A PCB bill of materials is a document that lists all the components, materials and sub-assemblies required in a circuit board design project. A bill of materials is critical for a successful project and it should be reviewed regularly to ensure that all components are in stock and that the bill of materials is accurate. However, comparing different bills of materials manually can be a time-consuming process. Sierra Circuits’ new BOM Compare Tool is the first web application that enables you to compare BOMs and identify changes within seconds. By simply uploading two BOMs and mapping the columns, the tool displays all newly added, deleted or modified data instantly. The comparison results are sorted by Memo field and the result determines which BOM is considered as the baseline.