Reference

Unit Converter

A compact engineering unit converter for everyday product and development work. Convert SI, imperial, binary data units, speeds and time values without leaving the keyboard.

Millimeter
42,000 mm
Centimeter
4,200 cm
Meter
42 m
Kilometer
0.042 km
Inch
1,653.54330709 in
Foot
137.79527559 ft
Mile
0.02609759 mi
runtime

Browser-local execution

Inputs stay inside the current tab unless you copy, download or explicitly export.

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Session handoff

Magic Paste can pass input to a target tool through sessionStorage, never through the URL.

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User-owned state

Favorites, recent tools and workflow history are local browser data you can clear from the browser.

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How to use

  1. 01Pick a unit family such as Data, Speed or Temperature.
  2. 02Enter a value and choose the source unit.
  3. 03Copy the target unit you need from the result grid.
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FAQ

Does data conversion use decimal or binary units?
Both. KB/MB/GB use powers of 1000, while KiB/MiB/GiB use powers of 1024.
Can I use this offline?
Yes. All math is local JavaScript and does not need a network request.
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