Inches to Millimeters Converter

Free instant conversion between inches and millimeters. Perfect for engineering, construction, design, and everyday use.

Inches

in

Millimeters

mm

Real-time conversion active. Type in either field to convert instantly.

Conversion History

About This Conversion Tool

What is this tool?

This Inches to Millimeters Converter is a free online tool that provides instant, bidirectional conversion between imperial and metric units. Whether you're working on engineering projects, construction plans, product design, or DIY crafts, this tool helps you accurately convert measurements in real-time.

Key Features

  • Real-time bidirectional conversion
  • Fully responsive design for all devices
  • Conversion history tracking
  • Copy results to clipboard
  • Instant calculation as you type
  • 100% browser-based - no data leaves your device

How does the conversion work?

The conversion between inches and millimeters is based on the international standard where 1 inch equals exactly 25.4 millimeters. Our tool uses this precise conversion factor to ensure accuracy in all calculations. The formula used is:

millimeters = inches × 25.4
inches = millimeters ÷ 25.4

Common Applications

Engineering

Precision measurements for mechanical parts

Construction

Converting building plans between systems

Design

Creating products with international dimensions

Benefits of Using Our Tool

  • Accuracy: Precise calculations based on international standards
  • Time-saving: Instant conversions without manual calculations
  • Convenience: Accessible from any device with a web browser
  • Free: No cost, no registration required
  • Privacy: All calculations happen in your browser - no data is collected

Frequently Asked Questions

Why convert inches to millimeters?

Is this converter accurate enough for engineering work?

How do I convert fractional inches?

Does this tool store my conversion data?

Can I use this tool on my mobile device?

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