# Inches to MM

Convert inches to millimeters with configurable decimal precision

> Canonical page: https://elysiatools.com/en/tools/inches-to-mm

- **Category:** Math & Numbers

- **Keywords:** inches, millimeters, length, conversion, inch, mm

## 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.

## Inputs

- **Inches** (text): e.g. 1
- **Decimal Precision** (number)

## 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.

## Frequently asked questions

### 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.

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