Length Converter
Convert
Enter a value and pick the source and target units; the result updates live.
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Length is a measure of distance. The SI base unit is the metre (m); imperial units include inches, feet, yards and miles. In electronics, lengths from nanometres (chip fabrication) to kilometres (cable runs) all come up.
Converting between metric and imperial is essential when reading a datasheet in mm, ordering a part specified in inches, or calculating a cable run in metres vs. feet. The conversions are exact (1 in = 25.4 mm by definition).
Common applications
Reading a PCB dimension in mm; converting a cable run from metres to feet; comparing a chip feature size in nm to a wire in mm.
Frequently asked questions
The metre (m).
Exactly 25.4 mm (by international agreement).
1 ft = 0.3048 m. Multiply by 0.3048.