Inches to MM

Convert inches to millimeters with configurable decimal precision

Example Results

1 examples

Convert inches to millimeters

Convert an inch-based hardware measurement into millimeters

{
  "result": {
    "inches": 1,
    "millimeters": 25.4
  }
}
View input parameters
{ "inches": "1", "precision": 2 }

Key Facts

Category
Math, Date & Finance
Input Types
text, number
Output Type
json
Sample Coverage
1
API Ready
Yes

Overview

Quickly convert measurements from inches to millimeters with customizable decimal precision. This tool provides instant, accurate metric conversions, making it easy to translate imperial dimensions for engineering, manufacturing, and woodworking projects.

When to Use

  • •When translating imperial blueprints or technical drawings into metric units for manufacturing.
  • •When sourcing hardware components like screws, bolts, or pipes that are specified in inches but need to fit metric assemblies.
  • •When performing precise scientific or woodworking calculations that require exact millimeter values with custom decimal rounding.

How It Works

  • •Enter the length value in inches into the input field.
  • •Adjust the decimal precision value to set the desired number of decimal places between 0 and 10.
  • •View the instantly calculated millimeter result in the output JSON block.

Use Cases

Converting standard lumber dimensions from inches to millimeters for international woodworking projects.
Translating mechanical component specifications, like bearing diameters or thread sizes, for metric CNC machining.
Standardizing product dimension sheets for e-commerce platforms that require metric measurements.

Examples

1. Converting Hardware Bolt Diameter

Mechanical Engineer
Background
An engineer is working with a legacy machine design that specifies a bolt diameter of 0.375 inches, but the new manufacturing facility operates strictly in metric units.
Problem
Convert 0.375 inches to millimeters with high precision to ensure the replacement bolt fits perfectly.
How to Use
Input '0.375' in the Inches field and set the Decimal Precision to 4.
Example Config
{
  "inches": "0.375",
  "precision": 4
}
Outcome
The tool outputs a precise value of 9.525 millimeters.

2. Rough Woodworking Dimensioning

Woodworker
Background
A hobbyist woodworker is following a US-based plan that calls for a board thickness of 1.5 inches, but their local metric planer uses millimeters.
Problem
Convert 1.5 inches to millimeters, rounded to a single decimal place for quick workshop reference.
How to Use
Input '1.5' in the Inches field and set the Decimal Precision to 1.
Example Config
{
  "inches": "1.5",
  "precision": 1
}
Outcome
The tool outputs 38.1 millimeters, allowing the woodworker to quickly set up their planer.

Try with Samples

math-&-numbers
Web Image Processing Python Samples
Web Python image processing examples using PIL/Pillow including reading, saving, resizing, and format conversion
task convert
sample

Related Hubs

Audio Encoding and Format Conversion Tools
Compare audio format conversion, bitrate changes, sample-rate conversion, codec swaps, and export tools in one hub for delivery and archive workflows.
Image Format Conversion and Animated Export Tools
Compare image format converters for JPG, PNG, GIF, AVIF, WebP, TIFF, ICO, base64, and animation-friendly exports in one hub.
JSON Interchange and Format Translation Tools
Compare JSON conversion tools for CSV, YAML, TOML, GraphQL, XML, Markdown, Excel, BSON, EDN, and related structured formats in one hub.
Color Space Conversion Tools for Web and Print
Curated tools for web-to-print color space conversion in one hub.

FAQ

How many millimeters are in one inch?

There are exactly 25.4 millimeters in one inch.

Can I control the rounding of the converted millimeter value?

Yes, you can configure the decimal precision from 0 up to 10 decimal places.

Does this tool support fractional inches?

You should input decimal values, such as 0.5 instead of 1/2, for the conversion.

What is the default decimal precision?

The default precision is set to 4 decimal places.

Is there a limit to the precision I can set?

Yes, the precision can be configured between 0 and 10 decimal places.

API Documentation

Request Endpoint

POST /en/api/tools/inches-to-mm

Request Parameters

Parameter Name Type Required Description
inches text Yes -
precision number No -

Response Format

{
  "key": {...},
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}
JSON Data: JSON Data

AI MCP Documentation

Add this tool to your MCP server configuration: 

{
  "mcpServers": {
    "elysiatools-inches-to-mm": {
      "name": "inches-to-mm",
      "description": "Convert inches to millimeters with configurable decimal precision",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=inches-to-mm",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

You can chain multiple tools, e.g.: `https://elysiatools.com/mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp`, max 20 tools.

If you encounter any issues, please contact us at [email protected]