Template:Round/doc

This templates rounds parameter 1 to the number of digits after the point optionally given as parameter 2. If parameter 2 is negative rounding is to a multiple of 10, 100, etc. If parameter 2 is undefined, numbers with 4 digits before the point are rounded to integers, numbers with 3 digits before the point are rounded to 1 digit after the point, numbers with 2 digits before the point are rounded to 2 digits after the point, numbers with 1 digit before the point or none are rounded to 3 digits after the point.

In other words, if parameter 2 is undefined, rounding is to 4 significant digits, except that it is not cruder than rounding to an integer, and not finer than rounding to three digits after the point.

Examples:



Note that trailing zeros are not shown, so rounding can seem cruder than has actually been applied:

While this is a limitation of the template (normally there would be trailing zeros to show the precision), there is also the general problem that if a number is an integer with trailing zeros the precision is not clear: