Editing Template:Convert/doc (section)

===Default rounding===
By {{tlf|Convert}} default, the conversion result will be rounded either to precision comparable to that of the input value (the number of digits after the decimal point—or the negative of the number of non-significant zeroes before the point—is increased by one if the conversion is a multiplication by a number between 0.02 and 0.2, remains the same if the factor is between 0.2 and 2, is decreased by 1 if it is between 2 and 20, and so on) or to two significant digits, whichever is more precise. An exception to this is ''rounding temperatures'' (see [[#Rounding temperatures|below]]).

{| class="wikitable"
|-
! colspan="3" | Examples of rounding
|-
|'''Input'''||'''Displays as'''||'''Note'''
|-
|<code><nowiki>{{convert|123|ft|m|-1}}</nowiki></code> || {{convert|123|ft|m|-1}} ||
|-
|<code><nowiki>{{convert|123|ft|m}}</nowiki></code> || {{convert|123|ft|m}} || same output as with 0 (below)
|-
|<code><nowiki>{{convert|123|ft|m|0}}</nowiki></code> || {{convert|123|ft|m|0}} ||
|-
|<code><nowiki>{{convert|123|ft|m|1}}</nowiki></code> || {{convert|123|ft|m|1}} ||
|-
|<code><nowiki>{{convert|123|ft|m|2}}</nowiki></code> || {{convert|123|ft|m|2}} ||123 [[Foot (unit)#Definition|feet]] is exactly 37.4904&nbsp;m which is rounded to 37&nbsp;m if this parameter is not specified at all
|-
|<code><nowiki>{{convert|500|ft|m|-1}}</nowiki></code> || {{convert|500|ft|m|-1}} ||
|-
|<code><nowiki>{{convert|500|ft|m}}</nowiki></code> || {{convert|500|ft|m}} || same output as with <code>-1</code> (above), because the conversion factor is between 0.2 and 2 (hence, it should produce same double-zero precision (−2) as in the input value), but the conversion must produce two significant digits at a minimum (hence, a higher single-zero precision (−1) is used)
|-
|<code><nowiki>{{convert|500|ft|m|0}}</nowiki></code> || {{convert|500|ft|m|0}} ||
|-
|<code><nowiki>{{convert|500|ft|m|1}}</nowiki></code> || {{convert|500|ft|m|1}} ||
|-
|<code><nowiki>{{convert|500|ft|m|2}}</nowiki></code> || {{convert|500|ft|m|2}} || exact value is 152.4 m
|-
|<code><nowiki>{{convert|500|ft|cm|-3}}</nowiki></code> || {{convert|500|ft|cm|-3}} ||
|-
|<code><nowiki>{{convert|500|ft|cm}}</nowiki></code> || {{convert|500|ft|cm}} || same output as with <code>-3</code> (above), because the conversion factor is between 20 and 200 (hence, it should decrease input value's double-zero precision (−2) by 2), but the conversion must produce two significant digits at a minimum (hence, a higher triple-zero precision (−3) is used)
|-
|<code><nowiki>{{convert|500|ft|cm|0}}</nowiki></code> || {{convert|500|ft|cm|0}} ||
|}<!--NOTE: rows require "nowiki", using &#123;{ disappears. -->

''Convert'' supports four types of rounding: