Wrench & Socket Size Converter

How to Use

Converting between metric and standard (imperial) wrench and socket sizes is simple:

1. Select the conversion direction (Metric to Standard or Standard to Metric)
2. Enter a size or select from common sizes
3. See the equivalent size and closest matches instantly
4. View the visual size comparison

Understanding Wrench & Socket Sizes

Metric System

Metric wrenches and sockets are measured in millimeters (mm), representing the distance across the flats of a fastener. Common metric sizes range from 6mm to 32mm.

Standard (Imperial) System

Standard or imperial wrenches and sockets are measured in inches or fractions of an inch. They’re typically labeled as fractions (e.g., 1/4”, 5/16”, 3/8”).

Conversion Accuracy

It’s important to note that conversions between metric and standard sizes are rarely exact. This tool provides:

• The mathematically exact conversion
• The closest standard size match
• Alternative sizes that may work in a pinch

Common Applications

This converter is useful for:

• Mechanics working on vehicles from different countries
• DIY enthusiasts with mixed tool sets
• Anyone trying to find the right tool for a fastener
• Shopping for tools when only one measurement system is listed

Tips for Working with Mixed Measurements

• Keep a conversion chart in your toolbox
• For critical applications, always use the exact size to avoid stripping fasteners
• When in doubt, try the suggested size and move up or down as needed
• Consider investing in both metric and standard tool sets for complete coverage