It is much easier to answer the question "Which country uses the metric system the least?" That would be the USA. The more trade a country has with the USA the more non-metric intrusions into their systems.
All other countries have the metric system as their primary method of tracking mass, volume and length and their derived measurements.
However almost all countries that are metric have holdover units that the older generation is more comfortable with or which are in folk sayings. Canada has hectares for farmland - but folks still refer to acres, sections and arpents. The British still sell pints of beer, not the 50 cl. glasses used in France, Chinese peasants probably still understand a tael. All English speakers would recognize "A miss is as good as a mile." or "The cowboy wore a ten gallon hat"
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The whole world is using solely the metric system. Only the US and two very little states forgot to change to metric.
The two main measuring systems used in the world are the metric system and the imperial system. The metric system is used in most countries and is based on units such as meters, grams, and liters. The imperial system is primarily used in the United States and includes units like inches, pounds, and gallons.
The United States is the only industrialized nation in the world that does not use the metric system of measurement as its primary system. The country mainly relies on the customary system based on inches, feet, pounds, and gallons for measurements.
The two main systems of measurement are the metric system and the imperial system. The metric system is based on units such as meters, grams, and liters, while the imperial system uses units like feet, pounds, and gallons. Other systems include the US customary system and the International System of Units (SI).
The US and I believe Liberia are the remaining two standouts which have not adopted the SI (metric) system. But the SI system is legal in the US, even if not formally adopted.
I think you are referring to SI, the international standard of measurement units agreed upon by the international scientific community. SI does not stand for the metric system per se, but it is not surprising that all of the SI units are metric since the world's preference for the metric system is almost universal. Currently there are only three countries in which the metric system is not the standard system of measurements.