Socket Size Converter

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Tools • mm ↔ inch

Spec

Size

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Choose a size to see equivalents

How to Use the Socket Size Converter

Pick the system you know — choose the sizing standard you already have (e.g. US).
Select your size — pick your known size from the list.
Read every equivalent — all other systems update instantly, with your source highlighted.

Why Use This Socket Size Converter

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Accurate Standards

Built on internationally recognised SI and standards-body conversion factors for dependable results.

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Instant & Animated

Results update live as you type, with a clear visual breakdown across every unit at once.

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100% Private

Everything runs in your browser — no account, no uploads, nothing leaves your device.

Understanding the Socket Size Converter

Toolboxes mix metric (mm) and SAE (inch) sockets, and the sizes are close but rarely identical — a 1/2" socket is 12.7 mm, so a 13 mm is the nearest metric size. Using the wrong one can round off a fastener.

This chart lines up SAE and metric socket and wrench sizes so you can grab the right one, or the closest safe substitute, for any bolt or nut.

Socket Size Converter FAQ

Is a 13mm socket the same as 1/2 inch? ▾

Almost — 1/2" = 12.7 mm, so a 13 mm socket is the closest metric size but is slightly larger. They are not perfectly interchangeable on tight fasteners.