BOM Batch ConverterImperial to Metric for Manufacturing RFQs
Convert entire Excel or CSV bill of materials files from inches to millimeters in seconds. Smart column detection automatically finds dimension fields, preserves your original data, and adds metric columns for seamless supplier communication. Perfect for RFQ preparation, international manufacturing, and design transfer to metric markets.
Upload BOM File
No File Uploaded
Upload an Excel or CSV file to start batch converting imperial dimensions to metric. The converter will automatically detect dimension columns and convert all values while preserving your original data structure.
Why Use Our BOM Batch Converter?
Smart Column Detection
Automatically identifies dimension columns by analyzing headers and content patterns. Recognizes common formats like "2.5\"", "2.5 inches", and range values like "0.5-0.6\"".
100% Client-Side Processing
Your BOM data never leaves your browser. All file processing happens locally on your device for complete privacy and security. No uploads, no server storage.
Preserves Original Data
Keeps all your original columns intact and adds new metric columns. Perfect for dual-unit documentation required by international manufacturing partners.
Instant Batch Processing
Process hundreds of rows in seconds. Supports Excel (.xlsx) and CSV formats for maximum compatibility with your existing workflow.
Range Value Support
Handles tolerance ranges like "2.5-2.6\"" and converts them properly to "63.50-66.04 mm". Essential for maintaining design specifications.
Multiple Export Formats
Download converted results as Excel or CSV. Compatible with CAD software, ERP systems, and email attachments for supplier quotes.
Common Use Cases
RFQ Preparation for Overseas Suppliers
You have a US-designed product with imperial BOM. Need to send RFQ to Chinese or European manufacturers who use metric.
Solution: Upload your Excel BOM, convert all dimension columns to metric, download dual-unit file, send to suppliers with both imperial and metric specs clearly marked.
Design Transfer to Metric Markets
Expanding product to new markets. Engineering team uses imperial, but local manufacturing requires metric drawings.
Solution: Batch convert complete BOM tables to establish metric specifications. Maintain dual units during transition period to avoid confusion.
Factory Documentation Updates
Legacy products designed in inches. Modern CNC machines and QC equipment use metric. Need updated documentation.
Solution: Convert historical BOM files to create metric-primary documentation. Add metric columns for machine operators while keeping original imperial for reference.
Quality Control Cross-Reference
Inspectors need to verify parts against design specs. Measuring tools are metric but drawings are imperial.
Solution: Generate dual-unit inspection sheets from your BOM. QC team can verify measurements in metric while referencing original imperial specifications.
How the BOM Converter Works
Upload File
Drag and drop your Excel (.xlsx) or CSV file. Files are processed entirely in your browser.
Auto Detection
Smart algorithm identifies dimension columns by analyzing headers and content patterns.
Preview Results
Review converted data in an interactive table. Adjust precision and options as needed.
Download
Export to Excel or CSV format. Ready to send to suppliers or import into your systems.
Supported Input Formats
The converter recognizes these dimension formats:
Column Detection Keywords:
Automatically detects columns with headers containing: "size", "dimension", "diameter", "length", "width", "height", "thickness", "depth", "OD", "ID", or cells with inch symbols.
Best Practices for BOM Conversion
✅ Do This
- •Use clear column headers like "Diameter (in)" or "Length"
- •Keep dimension data consistent within each column
- •Review preview before downloading final file
- •Select appropriate decimal precision for your application
- •Keep original imperial columns for reference
❌ Avoid This
- •Mixing imperial and metric in the same column
- •Using ambiguous headers without units
- •Including text descriptions in dimension cells
- •Converting already-metric dimensions
- •Deleting original columns before verification
Frequently Asked Questions
Is my BOM data uploaded to your servers?
No. All file processing happens entirely in your web browser using JavaScript. Your data never leaves your device. We cannot see, store, or access your files. This ensures complete privacy and security for proprietary designs.
What file formats are supported?
Excel files (.xlsx) and CSV files (.csv) are supported. Most CAD systems and ERP software can export to these formats. The converter preserves all non-dimension columns and data types during conversion.
How accurate is the conversion?
Uses the exact standard conversion factor: 1 inch = 25.4 mm. You can choose output precision from 1-4 decimal places. For precision manufacturing, we recommend 2-3 decimals (e.g., 63.50 mm) for typical tolerances.
Can it handle tolerance ranges like "2.5-2.6 inches"?
Yes. The converter recognizes range formats (2.5-2.6) and converts both values while preserving the range notation. Example: "2.5-2.6\"" becomes "63.50-66.04 mm". Also handles tolerance formats like 2.500±0.005.
What if it doesn't detect my dimension columns?
The converter looks for common dimension keywords in headers (size, length, diameter, etc.) and cells with inch symbols. If auto-detection fails, ensure your columns have clear headers and use consistent inch notation (e.g., add " symbol).
Can I convert the same file multiple times?
Yes. Each conversion is independent and doesn't affect your original file. You can upload again with different precision settings or options. We recommend keeping your original imperial file as the master reference.
Related Manufacturing Tools
Precision Inch to MM Converter
Convert individual dimensions with up to 6 decimal precision. Perfect for single values and quick conversions.
Use Converter →Machining Allowance Calculator
Calculate blank, rough, and finish sizes for CNC operations. Add machining allowances to your converted BOM.
Calculate Allowances →Fastener Matcher
Find metric equivalents for imperial threads and hardware. Complete your BOM with metric fastener specifications.
Match Fasteners →Tolerance Converter
Convert ANSI tolerances to ISO grades. Ensure your BOM specifications match international standards.
Convert Tolerances →Start Converting Your BOMs
Save hours of manual conversion work. Join hundreds of engineers and procurement specialists who use our BOM converter for RFQ preparation and supplier communication.