{{safesubst:convert/{{{2}}}|{{{1}}}|0|{{{3}}}||||||r=re|d=LoffAonDbSoff|s=}}
The Template:Cvt is an abbreviated form of {{Convert}}, with default option "abbr=on" to show unit symbols (abbreviated). Cvt is intended for use where many conversions are needed, such as in a table. The abbreviated form allows numerous, repeated uses without cluttering the markup for the page.
Template:Cvt supports all major options of {Convert}, including to reset option abbr=off (or abbr=none, in/out, comma, or abbr=values) and lk=on (or lk=in, lk=out), adj=on (or adj=mid|xxxx), and disp=flip, "disp=x| or", "disp=x|/" and "disp=x|<|>" plus other options.
Essentially, "{{cvt}}" is equivalent to "{{convert|abbr=on}}" but 12 shorter:
{{convert|4|km|abbr=on}} → 4 km (2.5 mi) {{cvt|4|km}} → Template:Convert/km {{cvt|9|m|ft|disp=x| or }} → Template:Convert/m
For full documentation, with examples, see: Template:Convert/doc.