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 mmCentimeter
4,200 cmMeter
42 mKilometer
0.042 kmInch
1,653.54330709 inFoot
137.79527559 ftMile
0.02609759 miruntime
Browser-local execution
Inputs stay inside the current tab unless you copy, download or explicitly export.
memory
Session handoff
Magic Paste can pass input to a target tool through sessionStorage, never through the URL.
control
User-owned state
Favorites, recent tools and workflow history are local browser data you can clear from the browser.
smart handoff graph
session handoff readySuggested next moves
sponsor
Sponsor this toolFixed native slots for developer products. No third-party tracking, no popups, no layout shift.
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How to use
- 01Pick a unit family such as Data, Speed or Temperature.
- 02Enter a value and choose the source unit.
- 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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