"Metric conversion" refers to the change from English units of measurement to metric units.
There is no single conversion unless you consider a systemic to an evolutionary hotchpotch, mishmash as a conversion. There are different conversions for different measures.
First, there is no "English". Second, there are hundreds on conversion factors between the near-obsolete (conventional) and metric systems. For mass alone, for example, there are conversions from grain to milligram, ounce to gram, pound to kilogram, stone to kilogram, hundredweight to kilogram, Imperial ton to metric ton. There are more that these.
metric conversion
voluntary conversion
conversion table metric to SAE
One can find a printable metric conversion chart on most rulers or in calculators that include manual books with conversion charts. Printable metric conversion charts can be found in most encyclopedias well -- they can be photocopied.
Not sure about your question but 25.4 is a standard metric to English conversion of mm to inches. 25.4 mm = 1.00 in.
The basic unit of length in the metric system is the meter.
The US Metric Conversion Act calls for a coordinated national policy to encourage the use of the metric system in the United States. This is intended to facilitate compatibility with the global economy and promote efficiency in commerce and science.
Bushels are a unit of measurement in the English system, not the metric system.
In the metric system, time is typically expressed in hours and minutes like in the standard system. So, 24 hours remains 24 hours in the metric system with no conversion necessary.